1
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Martinez Grundman JE, Schultz TD, Schlessman JL, Liu K, Johnson EA, Lecomte JTJ. Heme d formation in a Shewanella benthica hemoglobin. J Inorg Biochem 2024; 259:112654. [PMID: 38959524 DOI: 10.1016/j.jinorgbio.2024.112654] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2024] [Revised: 06/25/2024] [Accepted: 06/25/2024] [Indexed: 07/05/2024]
Abstract
In our continued investigations of microbial globins, we solved the structure of a truncated hemoglobin from Shewanella benthica, an obligate psychropiezophilic bacterium. The distal side of the heme active site is lined mostly with hydrophobic residues, with the exception of a tyrosine, Tyr34 (CD1) and a histidine, His24 (B13). We found that purified SbHbN, when crystallized in the ferric form with polyethylene glycol as precipitant, turned into a green color over weeks. The electron density obtained from the green crystals accommodated a trans heme d, a chlorin-type derivative featuring a γ-spirolactone and a vicinal hydroxyl group on a pyrroline ring. In solution, exposure of the protein to one equivalent of hydrogen peroxide resulted in a similar green color change, but caused by the formation of multiple products. These were oxidation species released on protein denaturation, likely including heme d, and a species with heme covalently attached to the polypeptide. The Tyr34Phe replacement prevented the formation of both heme d and the covalent linkage. The ready modification of heme b by SbHbN expands the range of chemistries supported by the globin fold and offers a route to a novel heme cofactor.
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Affiliation(s)
| | - Thomas D Schultz
- T.C. Jenkins Department of Biophysics, Johns Hopkins University, Baltimore, MD 21218, USA
| | | | - Kevin Liu
- T.C. Jenkins Department of Biophysics, Johns Hopkins University, Baltimore, MD 21218, USA
| | - Eric A Johnson
- Department of Biology, Johns Hopkins University, Baltimore, MD 21218, USA
| | - Juliette T J Lecomte
- T.C. Jenkins Department of Biophysics, Johns Hopkins University, Baltimore, MD 21218, USA.
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2
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Zhang Z, Hu B, Zhang T, Luo Z, Zhou J, Li J, Chen J, Du G, Zhao X. The modification of heme special importer to improve the production of active hemoglobins in Escherichia coli. Biotechnol Lett 2024; 46:545-558. [PMID: 38717663 DOI: 10.1007/s10529-024-03488-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2024] [Revised: 03/30/2024] [Accepted: 04/14/2024] [Indexed: 07/03/2024]
Abstract
To enhance the import of heme for the production of active hemoproteins in Escherichia coli C41 (DE3) lacking the special heme import system, heme receptor ChuA from E. coli Nissle 1917 was modified through molecular docking and the other components (ChuTUV) for heme import was overexpressed, while heme import was tested through growth assay and heme sensor HS1 detection. A ChuA mutant G360K was selected, which could import 3.91 nM heme, compared with 2.92 nM of the wild-type ChuA. In addition, it presented that the expression of heme transporters ChuTUV was not necessary for heme import. Based on the modification of ChuA (G360K), the titer of human hemoglobin and the peroxidase activity of leghemoglobin reached 1.19 μg g-1 DCW and 24.16 103 U g-1 DCW, compared with 1.09 μg g-1 DCW and 21.56 103 U g-1 DCW of the wild-type ChuA, respectively. Heme import can be improved through the modification of heme receptor and the engineered strain with improved heme import has a potential to efficiently produce high-active hemoproteins.
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Affiliation(s)
- Zihan Zhang
- Science Center for Future Foods, Jiangnan University, 1800 Lihu Road, Wuxi, 214122, Jiangsu, China
- Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, 1800 Lihu Road, Wuxi, 214122, Jiangsu, China
- Jiangsu Province Engineering Research Center of Food Synthetic Biotechnology, Jiangnan University, 1800 Lihu Road, Wuxi, 214122, Jiangsu, China
- Engineering Research Center of Ministry of Education On Food Synthetic Biotechnology, Jiangnan University, 1800 Lihu Road, Wuxi, 214122, Jiangsu, China
| | - Baodong Hu
- Science Center for Future Foods, Jiangnan University, 1800 Lihu Road, Wuxi, 214122, Jiangsu, China
- Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, 1800 Lihu Road, Wuxi, 214122, Jiangsu, China
- Jiangsu Province Engineering Research Center of Food Synthetic Biotechnology, Jiangnan University, 1800 Lihu Road, Wuxi, 214122, Jiangsu, China
- Engineering Research Center of Ministry of Education On Food Synthetic Biotechnology, Jiangnan University, 1800 Lihu Road, Wuxi, 214122, Jiangsu, China
| | - Tao Zhang
- Science Center for Future Foods, Jiangnan University, 1800 Lihu Road, Wuxi, 214122, Jiangsu, China
- Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, 1800 Lihu Road, Wuxi, 214122, Jiangsu, China
- Jiangsu Province Engineering Research Center of Food Synthetic Biotechnology, Jiangnan University, 1800 Lihu Road, Wuxi, 214122, Jiangsu, China
- Engineering Research Center of Ministry of Education On Food Synthetic Biotechnology, Jiangnan University, 1800 Lihu Road, Wuxi, 214122, Jiangsu, China
| | - Zhengshan Luo
- Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, 1800 Lihu Road, Wuxi, 214122, Jiangsu, China
| | - Jingwen Zhou
- Science Center for Future Foods, Jiangnan University, 1800 Lihu Road, Wuxi, 214122, Jiangsu, China
- Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, 1800 Lihu Road, Wuxi, 214122, Jiangsu, China
- Jiangsu Province Engineering Research Center of Food Synthetic Biotechnology, Jiangnan University, 1800 Lihu Road, Wuxi, 214122, Jiangsu, China
- Engineering Research Center of Ministry of Education On Food Synthetic Biotechnology, Jiangnan University, 1800 Lihu Road, Wuxi, 214122, Jiangsu, China
| | - Jianghua Li
- Science Center for Future Foods, Jiangnan University, 1800 Lihu Road, Wuxi, 214122, Jiangsu, China
- Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, 1800 Lihu Road, Wuxi, 214122, Jiangsu, China
- Jiangsu Province Engineering Research Center of Food Synthetic Biotechnology, Jiangnan University, 1800 Lihu Road, Wuxi, 214122, Jiangsu, China
- Engineering Research Center of Ministry of Education On Food Synthetic Biotechnology, Jiangnan University, 1800 Lihu Road, Wuxi, 214122, Jiangsu, China
| | - Jian Chen
- Science Center for Future Foods, Jiangnan University, 1800 Lihu Road, Wuxi, 214122, Jiangsu, China
- Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, 1800 Lihu Road, Wuxi, 214122, Jiangsu, China
- Jiangsu Province Engineering Research Center of Food Synthetic Biotechnology, Jiangnan University, 1800 Lihu Road, Wuxi, 214122, Jiangsu, China
- Engineering Research Center of Ministry of Education On Food Synthetic Biotechnology, Jiangnan University, 1800 Lihu Road, Wuxi, 214122, Jiangsu, China
| | - Guocheng Du
- Science Center for Future Foods, Jiangnan University, 1800 Lihu Road, Wuxi, 214122, Jiangsu, China
- Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, 1800 Lihu Road, Wuxi, 214122, Jiangsu, China
- Jiangsu Province Engineering Research Center of Food Synthetic Biotechnology, Jiangnan University, 1800 Lihu Road, Wuxi, 214122, Jiangsu, China
- Engineering Research Center of Ministry of Education On Food Synthetic Biotechnology, Jiangnan University, 1800 Lihu Road, Wuxi, 214122, Jiangsu, China
- Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, 1800 Lihu Road, Wuxi, 214122, Jiangsu, China
| | - Xinrui Zhao
- Science Center for Future Foods, Jiangnan University, 1800 Lihu Road, Wuxi, 214122, Jiangsu, China.
- Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, 1800 Lihu Road, Wuxi, 214122, Jiangsu, China.
- Jiangsu Province Engineering Research Center of Food Synthetic Biotechnology, Jiangnan University, 1800 Lihu Road, Wuxi, 214122, Jiangsu, China.
- Engineering Research Center of Ministry of Education On Food Synthetic Biotechnology, Jiangnan University, 1800 Lihu Road, Wuxi, 214122, Jiangsu, China.
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3
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Lučić M, Wilson MT, Pullin J, Hough MA, Svistunenko DA, Worrall JAR. New insights into controlling radical migration pathways in heme enzymes gained from the study of a dye-decolorising peroxidase. Chem Sci 2023; 14:12518-12534. [PMID: 38020392 PMCID: PMC10646903 DOI: 10.1039/d3sc04453j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2023] [Accepted: 10/06/2023] [Indexed: 12/01/2023] Open
Abstract
In heme enzymes, such as members of the dye-decolorising peroxidase (DyP) family, the formation of the highly oxidising catalytic Fe(iv)-oxo intermediates following reaction with hydrogen peroxide can lead to free radical migration (hole hopping) from the heme to form cationic tyrosine and/or tryptophan radicals. These species are highly oxidising (∼1 V vs. NHE) and under certain circumstances can catalyse the oxidation of organic substrates. Factors that govern which specific tyrosine or tryptophan the free radical migrates to in heme enzymes are not well understood, although in the case of tyrosyl radical formation the nearby proximity of a proton acceptor is a recognised facilitating factor. By using an A-type member of the DyP family (DtpAa) as an exemplar, we combine protein engineering, X-ray crystallography, hole-hopping calculations, EPR spectroscopy and kinetic modelling to provide compelling new insights into the control of radical migration pathways following reaction of the heme with hydrogen peroxide. We demonstrate that the presence of a tryptophan/tyrosine dyad motif displaying a T-shaped orientation of aromatic rings on the proximal side of the heme dominates the radical migration landscape in wild-type DtpAa and continues to do so following the rational engineering into DtpAa of a previously identified radical migration pathway in an A-type homolog on the distal side of the heme. Only on disrupting the proximal dyad, through removal of an oxygen atom, does the radical migration pathway then switch to the engineered distal pathway to form the desired tyrosyl radical. Implications for protein design and biocatalysis are discussed.
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Affiliation(s)
- Marina Lučić
- School of Life Sciences, University of Essex Wivenhoe Park Colchester Essex CO4 3SQ UK
| | - Michael T Wilson
- School of Life Sciences, University of Essex Wivenhoe Park Colchester Essex CO4 3SQ UK
| | - Jacob Pullin
- School of Life Sciences, University of Essex Wivenhoe Park Colchester Essex CO4 3SQ UK
| | - Michael A Hough
- School of Life Sciences, University of Essex Wivenhoe Park Colchester Essex CO4 3SQ UK
- Diamond Light Source, Harwell Science and Innovation Campus Didcot Oxfordshire OX11 0DE UK
| | - Dimitri A Svistunenko
- School of Life Sciences, University of Essex Wivenhoe Park Colchester Essex CO4 3SQ UK
| | - Jonathan A R Worrall
- School of Life Sciences, University of Essex Wivenhoe Park Colchester Essex CO4 3SQ UK
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4
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Kesimal B, Balci B, Cakal D, Önal AM, Cihaner A. Synthesis and Characterization of a Luminol Based Chemiluminescent Trimeric System. J Fluoresc 2023:10.1007/s10895-023-03172-9. [PMID: 36773099 DOI: 10.1007/s10895-023-03172-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2023] [Accepted: 02/06/2023] [Indexed: 02/12/2023]
Abstract
A luminol based chemiluminescent trimeric system, namely 2,3-dihydro-5,8-di(thiophen-2-yl)phthalazine-1,4-dione (T2B-Lum), bearing thiophene rings as donor units and 2,3-dihydrophthalazine-1,4-dione as an acceptor unit was synthesized in two steps via donor-acceptor-donor approach using two different methods. It was found that T2B-Lum emits chemiluminescent light when exposed to H2O2 in a basic medium, and the presence of substituents and the type of aromatic ring bearing chemiluminescent active group have a direct effect on the compound's sensitivity. Among the members of a large family of metal ions, fluorescent and chemiluminescent T2B-Lum exhibited high sensitivity to Cu2+ and Fe3+ ions. Except for other metal cations (silver(I), cadmium(II), cobalt(II), iron(III), lithium(I), magnesium(II), manganese(II), nickel(II), zinc(II)), it has been observed that T2B-Lum is mostly sensitive to copper(II) ions with a detection limit value of 2.2 × 10- 3 M. On the other hand, T2B-Lum was also found to exhibit a high sensitivity to extremely dilute aqueous solutions (e.g., 1:50.000 dilution) of blood samples, making it a promising candidate for use in forensic applications.
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Affiliation(s)
- Busra Kesimal
- Atilim Optoelectronic Materials and Solar Energy Laboratory (ATOMSEL), Department of Chemical Engineering, Atilim University, TR-06830, Ankara, Turkey.,Graduate School of Natural and Applied Sciences, Atilim University, TR-06830, Ankara, Turkey
| | - Burcu Balci
- Atilim Optoelectronic Materials and Solar Energy Laboratory (ATOMSEL), Department of Chemical Engineering, Atilim University, TR-06830, Ankara, Turkey.,Graduate School of Natural and Applied Sciences, Atilim University, TR-06830, Ankara, Turkey
| | - Deniz Cakal
- Department of Chemistry, Middle East Technical University, TR-06800, Ankara, Turkey
| | - Ahmet M Önal
- Department of Chemistry, Middle East Technical University, TR-06800, Ankara, Turkey
| | - Atilla Cihaner
- Atilim Optoelectronic Materials and Solar Energy Laboratory (ATOMSEL), Department of Chemical Engineering, Atilim University, TR-06830, Ankara, Turkey.
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5
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Kosmachevskaya OV, Nasybullina EI, Pugachenko IS, Novikova NN, Topunov AF. Antiglycation and Antioxidant Effect of Nitroxyl towards Hemoglobin. Antioxidants (Basel) 2022; 11:antiox11102007. [PMID: 36290730 PMCID: PMC9599031 DOI: 10.3390/antiox11102007] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2022] [Revised: 10/03/2022] [Accepted: 10/06/2022] [Indexed: 01/17/2023] Open
Abstract
Donors of nitroxyl and nitroxyl anion (HNO/NO−) are considered to be promising pharmacological treatments with a wide range of applications. Remarkable chemical properties allow nitroxyl to function as a classic antioxidant. We assume that HNO/NO− can level down the non-enzymatic glycation of biomolecules. Since erythrocyte hemoglobin (Hb) is highly susceptible to non-enzymatic glycation, we studied the effect of a nitroxyl donor, Angeli’s salt, on Hb modification with methylglyoxal (MG) and organic peroxide―tert-butyl hydroperoxide (t-BOOH). Nitroxyl dose-dependently decreased the amount of protein carbonyls and advanced glycation end products (AGEs) that were formed in the case of Hb incubation with MG. Likewise, nitroxyl effectively protected Hb against oxidative modification with t-BOOH. It slowed down the destruction of heme, formation of carbonyl derivatives and inter-subunit cross-linking. The protective effect of nitroxyl on Hb in this system is primarily associated with nitrosylation of oxidized Hb and reduction of its ferryl form, which lowers the yield of free radical products. We suppose that the dual (antioxidant and antiglycation) effect of nitroxyl makes its application possible as part of an additional treatment strategy for oxidative and carbonyl stress-associated diseases.
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Affiliation(s)
- Olga V. Kosmachevskaya
- Bach Institute of Biochemistry, Research Center of Biotechnology of the Russian Academy of Sciences, 119071 Moscow, Russia
| | - Elvira I. Nasybullina
- Bach Institute of Biochemistry, Research Center of Biotechnology of the Russian Academy of Sciences, 119071 Moscow, Russia
| | - Igor S. Pugachenko
- Bach Institute of Biochemistry, Research Center of Biotechnology of the Russian Academy of Sciences, 119071 Moscow, Russia
| | | | - Alexey F. Topunov
- Bach Institute of Biochemistry, Research Center of Biotechnology of the Russian Academy of Sciences, 119071 Moscow, Russia
- Correspondence: ; Tel.: +7-916-157-6367
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6
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Imai T, Tobe R, Honda K, Tanaka M, Kawamoto J, Mihara H. Group II truncated haemoglobin YjbI prevents reactive oxygen species-induced protein aggregation in Bacillus subtilis. eLife 2022; 11:70467. [PMID: 36125244 PMCID: PMC9536834 DOI: 10.7554/elife.70467] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2021] [Accepted: 09/19/2022] [Indexed: 12/12/2022] Open
Abstract
Oxidative stress-mediated formation of protein hydroperoxides can induce irreversible fragmentation of the peptide backbone and accumulation of cross-linked protein aggregates, leading to cellular toxicity, dysfunction, and death. However, how bacteria protect themselves from damages caused by protein hydroperoxidation is unknown. Here, we show that YjbI, a group II truncated haemoglobin from Bacillus subtilis, prevents oxidative aggregation of cell-surface proteins by its protein hydroperoxide peroxidase-like activity, which removes hydroperoxide groups from oxidised proteins. Disruption of the yjbI gene in B. subtilis lowered biofilm water repellence, which associated with the cross-linked aggregation of the biofilm matrix protein TasA. YjbI was localised to the cell surface or the biofilm matrix, and the sensitivity of planktonically grown cells to generators of reactive oxygen species was significantly increased upon yjbI disruption, suggesting that YjbI pleiotropically protects labile cell-surface proteins from oxidative damage. YjbI removed hydroperoxide residues from the model oxidised protein substrate bovine serum albumin and biofilm component TasA, preventing oxidative aggregation in vitro. Furthermore, the replacement of Tyr63 near the haem of YjbI with phenylalanine resulted in the loss of its protein peroxidase-like activity, and the mutant gene failed to rescue biofilm water repellency and resistance to oxidative stress induced by hypochlorous acid in the yjbI-deficient strain. These findings provide new insights into the role of truncated haemoglobin and the importance of hydroperoxide removal from proteins in the survival of aerobic bacteria.
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Affiliation(s)
- Takeshi Imai
- Hyogo Prefectural Institute of Technology, Hyogo, Japan
| | - Ryuta Tobe
- Department of Biotechnology, Ritsumeikan University, Shiga, Japan
| | - Koji Honda
- Hyogo Prefectural Institute of Technology, Hyogo, Japan
| | - Mai Tanaka
- Department of Biotechnology, Ritsumeikan University, Shiga, Japan
| | - Jun Kawamoto
- Institute for Chemical Research, Kyoto University, Kyoto, Japan
| | - Hisaaki Mihara
- Department of Biotechnology, Ritsumeikan University, Shiga, Japan
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Barozi V, Musyoka TM, Sheik Amamuddy O, Tastan Bishop Ö. Deciphering Isoniazid Drug Resistance Mechanisms on Dimeric Mycobacterium tuberculosis KatG via Post-molecular Dynamics Analyses Including Combined Dynamic Residue Network Metrics. ACS OMEGA 2022; 7:13313-13332. [PMID: 35474779 PMCID: PMC9025985 DOI: 10.1021/acsomega.2c01036] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/20/2022] [Accepted: 03/22/2022] [Indexed: 05/12/2023]
Abstract
Resistance mutations in Mycobacterium tuberculosis (Mtb) catalase peroxidase protein (KatG), an essential enzyme in isoniazid (INH) activation, reduce the sensitivity of Mtb to first-line drugs, hence presenting challenges in tuberculosis (TB) management. Thus, understanding the mutational imposed resistance mechanisms remains of utmost importance in the quest to reduce the TB burden. Herein, effects of 11 high confidence mutations in the KatG structure and residue network communication patterns were determined using extensive computational approaches. Combined traditional post-molecular dynamics analysis and comparative essential dynamics revealed that the mutant proteins have significant loop flexibility around the heme binding pocket and enhanced asymmetric protomer behavior with respect to wild-type (WT) protein. Heme contact analysis between WT and mutant proteins identified a reduction to no contact between heme and residue His270, a covalent bond vital for the heme-enabled KatG catalytic activity. Betweenness centrality calculations showed large hub ensembles with new hubs especially around the binding cavity and expanded to the dimerization domain via interface in the mutant systems, providing possible compensatory allosteric communication paths for the active site as a result of the mutations which may destabilize the heme binding pocket and the loops in its vicinity. Additionally, an interesting observation came from Eigencentrality hubs, most of which are located in the C-terminal domain, indicating relevance of the domain in the protease functionality. Overall, our results provide insight toward the mechanisms involved in KatG-INH resistance in addition to identifying key regions in the enzyme functionality, which can be used for future drug design.
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Affiliation(s)
- Victor Barozi
- Research Unit in Bioinformatics
(RUBi), Department of Biochemistry and Microbiology, Rhodes University, Makhanda 6140 South Africa
| | - Thommas Mutemi Musyoka
- Research Unit in Bioinformatics
(RUBi), Department of Biochemistry and Microbiology, Rhodes University, Makhanda 6140 South Africa
| | - Olivier Sheik Amamuddy
- Research Unit in Bioinformatics
(RUBi), Department of Biochemistry and Microbiology, Rhodes University, Makhanda 6140 South Africa
| | - Özlem Tastan Bishop
- Research Unit in Bioinformatics
(RUBi), Department of Biochemistry and Microbiology, Rhodes University, Makhanda 6140 South Africa
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Kosmachevskaya OV, Nasybullina EI, Topunov AF. Peroxidase Activity of Leghemoglobin of Bean (Vicia faba L.) Nodules in Relation to Tert-Butyl Hydroperoxide. APPL BIOCHEM MICRO+ 2022. [DOI: 10.1134/s0003683822010045] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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9
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The dynamics of hemoglobin-haptoglobin complexes. Relevance for oxidative stress. J Mol Struct 2022. [DOI: 10.1016/j.molstruc.2021.131703] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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10
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Tomášková N, Novák P, Kožár T, Petrenčáková M, Jancura D, Yassaghi G, Man P, Sedlák E. Early modification of cytochrome c by hydrogen peroxide triggers its fast degradation. Int J Biol Macromol 2021; 174:413-423. [PMID: 33529629 DOI: 10.1016/j.ijbiomac.2021.01.189] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2020] [Revised: 01/26/2021] [Accepted: 01/28/2021] [Indexed: 12/16/2022]
Abstract
Cytochrome c (cyt c), in addition to its function as an electron shuttle in respiratory chain, is able to perform as a pseudo-peroxidase with a critical role during apoptosis. Incubation of cyt c with an excess of hydrogen peroxide leads to a suicide inactivation of the protein, which is accompanied by heme destruction and covalent modification of numerous amino acid residues. Although steady-state reactions of cyt c with an excess of hydrogen peroxide represent non-physiological conditions, they might be used for analysis of the first-modified amino acid in in vivo. Here, we observed oxidation of tyrosine residues 67 and 74 and heme as the first modifications found upon incubation with hydrogen peroxide. The positions of the oxidized tyrosines suggest a possible migration pathway of hydrogen peroxide-induced radicals from the site of heme localization to the protein surface. Analysis of a size of folded fraction of cyt c upon limited incubation with hydrogen peroxide indicates that the early oxidation of amino acids triggers an accelerated destruction of cyt c. Position of channels from molecular dynamics simulation structures of cyt c points to a location of amino acid residues exposed to reactive oxidants that are thus more prone to covalent modification.
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Affiliation(s)
- Nataša Tomášková
- Department of Biochemistry, Faculty of Science, P.J. Šafárik University, Moyzesova 11, 041 54 Košice, Slovakia
| | - Petr Novák
- Institute of Microbiology - BioCeV, Vídeňská 1083, 142 20 Prague 4, Czech Republic
| | - Tibor Kožár
- Center for Interdisciplinary Biosciences, Technology and Innovation Park, P.J. Šafárik University, Jesenná 5, 041 54 Košice, Slovakia
| | - Martina Petrenčáková
- Center for Interdisciplinary Biosciences, Technology and Innovation Park, P.J. Šafárik University, Jesenná 5, 041 54 Košice, Slovakia
| | - Daniel Jancura
- Department of Biophysics, Faculty of Science, P.J. Šafárik University, Jesenná 5, 041 54 Košice, Slovakia
| | - Ghazaleh Yassaghi
- Institute of Microbiology - BioCeV, Vídeňská 1083, 142 20 Prague 4, Czech Republic
| | - Petr Man
- Institute of Microbiology - BioCeV, Vídeňská 1083, 142 20 Prague 4, Czech Republic.
| | - Erik Sedlák
- Department of Biochemistry, Faculty of Science, P.J. Šafárik University, Moyzesova 11, 041 54 Košice, Slovakia; Center for Interdisciplinary Biosciences, Technology and Innovation Park, P.J. Šafárik University, Jesenná 5, 041 54 Košice, Slovakia.
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11
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Mardis KL, Niklas J, Omodayo H, Odella E, Moore TA, Moore AL, Poluektov OG. One Electron Multiple Proton Transfer in Model Organic Donor-Acceptor Systems: Implications for High Frequency EPR. APPLIED MAGNETIC RESONANCE 2020; 51:977-991. [PMID: 34764625 PMCID: PMC8579843 DOI: 10.1007/s00723-020-01252-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/26/2020] [Revised: 08/03/2020] [Indexed: 06/12/2023]
Abstract
EPR spectroscopy is an important spectroscopic method for identification and characterization of radical species involved in many biological reactions. The tyrosyl radical is one of the most studied amino acid radical intermediates in biology. Often in conjunction with histidine residues, it is involved in many fundamental biological electron and proton transfer processes, such as in the water oxidation in photosystem II. As biological processes are typically extremely complicated and hard to control, molecular bio-mimetic model complexes are often used to clarify the mechanisms of the biological reactions. Here we present theoretical calculations to investigate the sensitivity of magnetic resonance parameters to proton-coupled electron transfer events, as well as conformational substates of the molecular constructs which mimic the tyrosine-histidine (Tyr-His) pairs found in a large variety of proteins. Upon oxidation of the phenol, the Tyr analogue, these complexes can perform not only one-electron one-proton transfer (EPT), but also one-electron two-proton transfers (E2PT). It is shown that in aprotic environment the gX-components of the electronic g-tensor are extremely sensitive to the first proton transfer from the phenoxyl oxygen to the imidazole nitrogen (EPT product), leading to a significant increase of the gX-value of up to 0.003, but are not sensitive to the second proton transfer (E2PT product). In the latter case the change of the gX-value is much smaller (ca. 0.0001), which is too small to be distinguished even by high frequency EPR. The 14N hyperfine values are also too similar to allow differentiation between the different protonation states in EPT and E2PT. The magnetic resonance parameters were also calculated as a function of the rotation angles around single bonds. It was demonstrated that rotation of the phenoxyl group results in large positive changes (>0.001) in the gX-values. Analysis of the data reveals that the main source of these changes is related to the strength of the H-bond between phenoxyl oxygen and the proton(s) on N1 and N2 positions of the imidazole.
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Affiliation(s)
- Kristy L Mardis
- Department of Chemistry, Physics, and Engineering Studies, Chicago State University, Chicago, Illinois 60628, USA
| | - Jens Niklas
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, Illinois 60439, USA
| | - Harriet Omodayo
- Department of Chemistry, Physics, and Engineering Studies, Chicago State University, Chicago, Illinois 60628, USA
| | - Emmanuel Odella
- School of Molecular Sciences, Arizona State University, Tempe, Arizona, 85287, USA
| | - Thomas A Moore
- School of Molecular Sciences, Arizona State University, Tempe, Arizona, 85287, USA
| | - Ana L Moore
- School of Molecular Sciences, Arizona State University, Tempe, Arizona, 85287, USA
| | - Oleg G Poluektov
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, Illinois 60439, USA
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12
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Dhankhar P, Dalal V, Mahto JK, Gurjar BR, Tomar S, Sharma AK, Kumar P. Characterization of dye-decolorizing peroxidase from Bacillus subtilis. Arch Biochem Biophys 2020; 693:108590. [DOI: 10.1016/j.abb.2020.108590] [Citation(s) in RCA: 32] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2020] [Revised: 09/14/2020] [Accepted: 09/16/2020] [Indexed: 12/25/2022]
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13
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Taşdemir M, Çelikezen FÇ, Oto G, Özbey F. The effects of pretreatment with lithium metaborate dihydrate on lipid peroxidation and Ca, Fe, Mg, and K levels in serum of Wistar albino male rats exposed to Cd. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2020; 27:7702-7711. [PMID: 31889282 DOI: 10.1007/s11356-019-07516-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/29/2019] [Accepted: 12/23/2019] [Indexed: 06/10/2023]
Abstract
Boron and boron compounds have beneficial biological effects. Lithium metaborate dihydrate (LMBDH) is used in many branches of industry. Despite its wide industrial use, there is limited information about its biological effects on antioxidant defense system and trace element homeostasis. Therefore, the aim of this study was to evaluate the in vivo protective effects of LMBDH against CdCl2-induced oxidative stress and imbalance of some bioelements for the first time. In the study, totally 20 Wistar albino male rats were used. The rats were fed with pellet food and water ad libitum and divided into four groups including five rats in each. Group I was control group (standard pellet food + water + normal saline), Group II was CdCl2 (4.58 mg/kg/body weight/intraperitoneally/single dose), Group III was LMBDH (15 mg/kg/body weight/day orally, for 5 days), Group IV was CdCl2 (4.58 mg/kg/body weight/intraperitoneally/single dose in fifth day), and LMBDH (15 mg/kg/body weight/day orally for 5 days). The results showed that CdCl2 treatment increased blood MDA level and decreased antioxidant enzyme activities and the level of blood GSH compared to control group. Pretreatment with LMBDH significantly decreased MDA levels and increased SOD activity (p < 0.05). In addition, Ca, Fe, and K levels decreased in LMBDH pretreatment group in different statistically levels. However, Mg levels showed an increase in LMBDH pretreatment group. As a result, LMBDH pretreatment decreased MDA status and supported antioxidant system by increasing SOD activity. In addition, it did not exhibit an ameliorative effect on measured bioelement homeostasis.
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Affiliation(s)
- Muhammed Taşdemir
- Department of Chemistry, Bitlis Eren University, Faculty of Science, Bitlis, Turkey
| | | | - Gökhan Oto
- Department of Pharmacology and Toxicology, Yuzuncu Yil University, Faculty of Medicine, Van, Turkey
| | - Fahrettin Özbey
- Department of Statistics, Bitlis Eren University, Faculty of Science, Bitlis, Turkey
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14
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Svistunenko DA, Manole A. Tyrosyl radical in haemoglobin and haptoglobin-haemoglobin complex: how does haptoglobin make haemoglobin less toxic? J Biomed Res 2019; 34:281-291. [PMID: 32475850 PMCID: PMC7386409 DOI: 10.7555/jbr.33.20180084] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
One of the difficulties in creating a blood substitute on the basis of human haemoglobin (Hb) is the toxic nature of Hb when it is outside the safe environment of the red blood cells. The plasma protein haptoglobin (Hp) takes care of the Hb physiologically leaked into the plasma – it binds Hb and makes it much less toxic while retaining the Hb's high oxygen transporting capacity. We used Electron Paramagnetic Resonance (EPR) spectroscopy to show that the protein bound radical induced by H2O2 in Hb and Hp-Hb complex is formed on the same tyrosine residue(s), but, in the complex, the radical is found in a more hydrophobic environment and decays slower than in unbound Hb, thus mitigating its oxidative capacity. The data obtained in this study might set new directions in engineering blood substitutes for transfusion that would have the oxygen transporting efficiency typical of Hb, but which would be non-toxic.
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Affiliation(s)
- Dimitri A Svistunenko
- Biomedical EPR Facility, School of Life Sciences, University of Essex, Colchester, Essex CO4 3SQ, UK
| | - Andreea Manole
- Laboratory of Genetics, The Salk Institute for Biological Studies, La Jolla, CA 92037, USA
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15
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Mannino MH, Patel RS, Eccardt AM, Perez Magnelli RA, Robinson CLC, Janowiak BE, Warren DE, Fisher JS. Myoglobin as a versatile peroxidase: Implications for a more important role for vertebrate striated muscle in antioxidant defense. Comp Biochem Physiol B Biochem Mol Biol 2019; 234:9-17. [PMID: 31051268 DOI: 10.1016/j.cbpb.2019.04.005] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2018] [Revised: 03/29/2019] [Accepted: 04/23/2019] [Indexed: 12/17/2022]
Abstract
Myoglobins (Mb) are ubiquitous proteins found in striated muscle of nearly all vertebrate taxa. Although their function is most commonly associated with facilitating oxygen storage and diffusion, Mb has also been implicated in cellular antioxidant defense. The oxidized (Fe3+) form of Mb (metMB) can react with hydrogen peroxide (H2O2) to produce ferrylMb. FerrylMb can be reduced back to metMb for another round of reaction with H2O2. In the present study, we have shown that horse skeletal muscle Mb displays peroxidase activity using 2,2'-azino-di-(3-ethylbenzothiazoline)-6-sulfonic acid (ABTS) and 3,3',5,5'-tetramethylbenzidine (TMB) as reducing substrates, as well as the biologically-relevant substrates NADH/NADPH, ascorbate, caffeic acid, and resveratrol. We have also shown that ferrylMb can be reduced by both ethanol and acetaldehyde, which are known to accumulate in some vertebrate tissues under anaerobic conditions, such as anoxic goldfish and crucian carp, implying a potential mechanism for ethanol detoxification in striated muscle. We found that metMb peroxidase activity is pH-dependent, increasing as pH decreases from 7.4 to 6.1, which is biologically relevant to anaerobic vertebrate muscle when incurring intracellular lactic acidosis. Finally, we found that metMb reacts with hypochlorite in a heme-dependent fashion, indicating that Mb could play a role in hypochlorite detoxification. Taken together, these data suggest that Mb peroxidase activity might be an important antioxidant mechanism in vertebrate cardiac and skeletal muscle under a variety of physiological conditions, such as those that might occur in contracting skeletal muscle or during hypoxia.
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16
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Chaplin AK, Chicano TM, Hampshire BV, Wilson MT, Hough MA, Svistunenko DA, Worrall JAR. An Aromatic Dyad Motif in Dye Decolourising Peroxidases Has Implications for Free Radical Formation and Catalysis. Chemistry 2019; 25:6141-6153. [PMID: 30945782 DOI: 10.1002/chem.201806290] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2018] [Indexed: 01/27/2023]
Abstract
Dye decolouring peroxidases (DyPs) are the most recent class of heme peroxidase to be discovered. On reacting with H2 O2 , DyPs form a high-valent iron(IV)-oxo species and a porphyrin radical (Compound I) followed by stepwise oxidation of an organic substrate. In the absence of substrate, the ferryl species decays to form transient protein-bound radicals on redox active amino acids. Identification of radical sites in DyPs has implications for their oxidative mechanism with substrate. Using a DyP from Streptomyces lividans, referred to as DtpA, which displays low reactivity towards synthetic dyes, activation with H2 O2 was explored. A Compound I EPR spectrum was detected, which in the absence of substrate decays to a protein-bound radical EPR signal. Using a newly developed version of the Tyrosyl Radical Spectra Simulation Algorithm, the radical EPR signal was shown to arise from a pristine tyrosyl radical and not a mixed Trp/Tyr radical that has been widely reported in DyP members exhibiting high activity with synthetic dyes. The radical site was identified as Tyr374, with kinetic studies inferring that although Tyr374 is not on the electron-transfer pathway from the dye RB19, its replacement with a Phe does severely compromise activity with other organic substrates. These findings hint at the possibility that alternative electron-transfer pathways for substrate oxidation are operative within the DyP family. In this context, a role for a highly conserved aromatic dyad motif is discussed.
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Affiliation(s)
- Amanda K Chaplin
- Present address: Department of Biochemistry, University of Cambridge, 80 Tennis Court Road, Cambridge, CB2 1GA, UK
| | - Tadeo Moreno Chicano
- Present address: Department of Molecular Mechanisms, Max Planck Institute for Medical Research, Jahnstraße 29, 69120, Heidelberg, Germany
| | - Bethany V Hampshire
- Present address: Department of Physics, University of Warwick, Coventry, CV4 7AL, UK
| | - Michael T Wilson
- School of Biological Sciences, University of Essex, Wivenhoe Park, Colchester, CO4 3SQ, UK
| | - Michael A Hough
- School of Biological Sciences, University of Essex, Wivenhoe Park, Colchester, CO4 3SQ, UK
| | - Dimitri A Svistunenko
- School of Biological Sciences, University of Essex, Wivenhoe Park, Colchester, CO4 3SQ, UK
| | - Jonathan A R Worrall
- School of Biological Sciences, University of Essex, Wivenhoe Park, Colchester, CO4 3SQ, UK
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17
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Vlasova II. Peroxidase Activity of Human Hemoproteins: Keeping the Fire under Control. Molecules 2018; 23:E2561. [PMID: 30297621 PMCID: PMC6222727 DOI: 10.3390/molecules23102561] [Citation(s) in RCA: 68] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2018] [Revised: 09/28/2018] [Accepted: 10/01/2018] [Indexed: 12/21/2022] Open
Abstract
The heme in the active center of peroxidases reacts with hydrogen peroxide to form highly reactive intermediates, which then oxidize simple substances called peroxidase substrates. Human peroxidases can be divided into two groups: (1) True peroxidases are enzymes whose main function is to generate free radicals in the peroxidase cycle and (pseudo)hypohalous acids in the halogenation cycle. The major true peroxidases are myeloperoxidase, eosinophil peroxidase and lactoperoxidase. (2) Pseudo-peroxidases perform various important functions in the body, but under the influence of external conditions they can display peroxidase-like activity. As oxidative intermediates, these peroxidases produce not only active heme compounds, but also protein-based tyrosyl radicals. Hemoglobin, myoglobin, cytochrome c/cardiolipin complexes and cytoglobin are considered as pseudo-peroxidases. Рeroxidases play an important role in innate immunity and in a number of physiologically important processes like apoptosis and cell signaling. Unfavorable excessive peroxidase activity is implicated in oxidative damage of cells and tissues, thereby initiating the variety of human diseases. Hence, regulation of peroxidase activity is of considerable importance. Since peroxidases differ in structure, properties and location, the mechanisms controlling peroxidase activity and the biological effects of peroxidase products are specific for each hemoprotein. This review summarizes the knowledge about the properties, activities, regulations and biological effects of true and pseudo-peroxidases in order to better understand the mechanisms underlying beneficial and adverse effects of this class of enzymes.
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Affiliation(s)
- Irina I Vlasova
- Federal Research and Clinical Center of Physical-Chemical Medicine, Department of Biophysics, Malaya Pirogovskaya, 1a, Moscow 119435, Russia.
- Institute for Regenerative Medicine, Laboratory of Navigational Redox Lipidomics, Sechenov University, 8-2 Trubetskaya St., Moscow 119991, Russia.
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18
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Mishra OP, Popov AV, Pietrofesa RA, Nakamaru-Ogiso E, Andrake M, Christofidou-Solomidou M. Synthetic secoisolariciresinol diglucoside (LGM2605) inhibits myeloperoxidase activity in inflammatory cells. Biochim Biophys Acta Gen Subj 2018; 1862:1364-1375. [PMID: 29524540 PMCID: PMC5970065 DOI: 10.1016/j.bbagen.2018.03.003] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2017] [Revised: 03/02/2018] [Accepted: 03/05/2018] [Indexed: 12/16/2022]
Abstract
BACKGROUND Myeloperoxidase (MPO) generates hypochlorous acid (HOCl) during inflammation and infection. We showed that secoisolariciresinol diglucoside (SDG) scavenges radiation-induced HOCl in physiological solutions. However, the action of SDG and its synthetic version, LGM2605, on MPO-catalyzed generation of HOCl is unknown. The present study evaluated the effect of LGM2605 on human MPO, and murine MPO from macrophages and neutrophils. METHODS MPO activity was determined fluorometrically using hypochlorite-specific 3'-(p-aminophenyl) fluorescein (APF). The effect of LGM2605 on (a) the peroxidase cycle of MPO was determined using Amplex Red while the effect on (b) the chlorination cycle was determined using a taurine chloramine assay. Using electron paramagnetic resonance (EPR) spectroscopy we determined the effect of LGM2605 on the EPR signals of MPO. Finally, computational docking of SDG was used to identify energetically favorable docking poses to enzyme's active site. RESULTS LGM2605 inhibited human and murine MPO activity. MPO inhibition was observed in the absence and presence of Cl-. EPR confirmed that LGM2605 suppressed the formation of Compound I, an oxoiron (IV) intermediate [Fe(IV)O] containing a porphyrin π-radical of MPO's catalytic cycle. Computational docking revealed that SDG can act as an inhibitor by binding to the enzyme's active site. CONCLUSIONS We conclude that LGM2605 inhibits MPO activity by suppressing both the peroxidase and chlorination cycles. EPR analysis demonstrated that LGM2605 inhibits MPO by decreasing the formation of the highly oxidative Compound I. This study identifies a novel mechanism of LGM2605 action as an inhibitor of MPO and indicates that LGM2605 may be a promising attenuator of oxidant-dependent inflammatory tissue damage.
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Affiliation(s)
- Om P Mishra
- Division of Pulmonary, Allergy and Critical Care, Department of Medicine, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA 19104, United States.
| | - Anatoliy V Popov
- Department of Radiology, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA 19104, United States.
| | - Ralph A Pietrofesa
- Division of Pulmonary, Allergy and Critical Care, Department of Medicine, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA 19104, United States.
| | - Eiko Nakamaru-Ogiso
- Department of Biochemistry and Biophysics, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA 19104, United States.
| | - Mark Andrake
- Molecular Modeling Facility, Fox Chase Cancer Center, Philadelphia, PA 19111, United States.
| | - Melpo Christofidou-Solomidou
- Division of Pulmonary, Allergy and Critical Care, Department of Medicine, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA 19104, United States.
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19
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Harnessing the evolutionary information on oxygen binding proteins through Support Vector Machines based modules. BMC Res Notes 2018; 11:290. [PMID: 29751818 PMCID: PMC5948687 DOI: 10.1186/s13104-018-3383-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2018] [Accepted: 04/30/2018] [Indexed: 02/06/2023] Open
Abstract
Objectives The arrival of free oxygen on the globe, aerobic life is becoming possible. However, it has become very clear that the oxygen binding proteins are widespread in the biosphere and are found in all groups of organisms, including prokaryotes, eukaryotes as well as in fungi, plants, and animals. The exponential growth and availability of fresh annotated protein sequences in the databases motivated us to develop an improved version of “Oxypred” for identifying oxygen-binding proteins. Results In this study, we have proposed a method for identifying oxy-proteins with two different sequence similarity cutoffs 50 and 90%. A different amino acid composition based Support Vector Machines models was developed, including the evolutionary profiles in the form position-specific scoring matrix (PSSM). The fivefold cross-validation techniques were applied to evaluate the prediction performance. Also, we compared with existing methods, which shows nearly 97% recognition, but, our newly developed models were able to recognize almost 99.99 and 100% in both oxy-50 and 90% similarity models respectively. Our result shows that our approaches are faster and achieve a better prediction performance over the existing methods. The web-server Oxypred2 was developed for an alternative method for identifying oxy-proteins with more additional modules including PSSM, available at http://bioinfo.imtech.res.in/servers/muthu/oxypred2/home.html. Electronic supplementary material The online version of this article (10.1186/s13104-018-3383-9) contains supplementary material, which is available to authorized users.
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20
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Libardi SH, Alves FR, Tabak M. Interaction of Glossoscolex paulistus extracellular hemoglobin with hydrogen peroxide: Formation and decay of ferryl-HbGp. Int J Biol Macromol 2018; 111:271-280. [PMID: 29305213 DOI: 10.1016/j.ijbiomac.2017.12.147] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2017] [Revised: 12/12/2017] [Accepted: 12/28/2017] [Indexed: 11/30/2022]
Abstract
The giant extracellular hemoglobin from earthworm Glossoscolex paulistus (HbGp) reacts with hydrogen peroxide, displaying peroxidase activity in the presence of guaiacol. The formation of ferryl-HbGp (compound II) from the peroxidase cycle was studied in the present work. The hypervalent ferryl-HbGp species was formed directly by the reaction of oxy-HbGp and hydrogen peroxide. The oxy-HbGp heme groups (144) under different excess of H2O2, relative to heme, showed an influence in the total amount of ferryl-HbGp at the end of the reaction. The ferryl-HbGp was formed with second order rate constant of 27.1±0.5M-1s-1, at pH7.0 and 25°C. The increase of the pH value to 8.0 induces both faster formation and decay of ferryl-HbGp, together with oligomeric dissociation induced by the presence of H2O2, as observed by DLS. This effect of dissociation increases the heme exposure and decreases the ferryl-HbGp stability, affecting the rate constant as a parallel reaction. At pH7.0, high excess of H2O2, above 1:5 oxy-HbGp heme: H2O2, produces the aggregation of the protein. Our results show for the first time, for an extracellular giant hemoglobin, the possible effects of oxidative stress induced by hydrogen peroxide.
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Affiliation(s)
- Silvia H Libardi
- Instituto de Química de São Carlos, Universidade de São Paulo, São Carlos, SP, Brazil.
| | - Fernanda R Alves
- Instituto de Química de São Carlos, Universidade de São Paulo, São Carlos, SP, Brazil
| | - Marcel Tabak
- Instituto de Química de São Carlos, Universidade de São Paulo, São Carlos, SP, Brazil
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21
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Van Doorslaer S, Cuypers B. Electron paramagnetic resonance of globin proteins – a successful match between spectroscopic development and protein research. Mol Phys 2017. [DOI: 10.1080/00268976.2017.1392629] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
| | - Bert Cuypers
- Department of Physics, University of Antwerp, Antwerp, Belgium
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22
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Sharma D, Bisht D. Role of Bacterioferritin & Ferritin in M. tuberculosis Pathogenesis and Drug Resistance: A Future Perspective by Interactomic Approach. Front Cell Infect Microbiol 2017. [PMID: 28642844 PMCID: PMC5462900 DOI: 10.3389/fcimb.2017.00240] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
Tuberculosis is caused by Mycobacterium tuberculosis, one of the most successful and deadliest human pathogen. Aminoglycosides resistance leads to emergence of extremely drug resistant strains of M. tuberculosis. Iron is crucial for the biological functions of the cells. Iron assimilation, storage and their utilization is not only involved in pathogenesis but also in emergence of drug resistance strains. We previously reported that iron storing proteins (bacterioferritin and ferritin) were found to be overexpressed in aminoglycosides resistant isolates. In this study we performed the STRING analysis of bacterioferritin & ferritin proteins and predicted their interactive partners [ferrochelatase (hemH), Rv1877 (hypothetical protein/probable conserved integral membrane protein), uroporphyrinogen decarboxylase (hemE) trigger factor (tig), transcriptional regulatory protein (MT3948), hypothetical protein (MT1928), glnA3 (glutamine synthetase), molecular chaperone GroEL (groEL1 & hsp65), and hypothetical protein (MT3947)]. We suggested that interactive partners of bacterioferritin and ferritin are directly or indirectly involved in M. tuberculosis growth, homeostasis, iron assimilation, virulence, resistance, and stresses.
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Affiliation(s)
- Divakar Sharma
- Department of Biochemistry, National JALMA Institute for Leprosy and Other Mycobacterial DiseasesAgra, India
| | - Deepa Bisht
- Department of Biochemistry, National JALMA Institute for Leprosy and Other Mycobacterial DiseasesAgra, India
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23
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Wu G, Tsai AL. Dynamics of Radical Intermediates in Prostaglandin H Synthase-1 Cyclooxygenase Reactions is Modulated by Multiple Factors. Protein Pept Lett 2017; 23:1013-1023. [PMID: 27748183 DOI: 10.2174/0929866523666161007151812] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2016] [Revised: 09/30/2016] [Accepted: 10/01/2016] [Indexed: 11/22/2022]
Abstract
Prostaglandin H synthase (PGHS) catalyzes the biosynthesis of PGG2 and PGH2, the precursor of all prostanoids, from arachidonic acid (AA). PGHS exhibits two enzymatic activities following a branched-chain radical mechanism: 1) a peroxidase activity (POX) that utilizes hydroperoxide through heme redox cycles to generate the critical Tyr385 tyrosyl radical for coupling both enzyme activities; 2) the cyclooxygenase (COX) activity inserting two oxygen molecules into AA to generate endoperoxide/hydroperoxide PGG2 through a series of radical intermediates. Upon the generation of Tyr385 radical, COX catalysis is initiated, with C13 pro-S hydrogen abstraction from AA by Tyr385 radical to generate arachidonyl substrate radical. Oxygen provides a large driving force for the subsequent fast steps leading to the formation of PGG2, including radical redistributions, ring formations, and rearrangements. On the other hand, if the supply of oxygen is severed, equilibrium between arachidonyl radical and tyrosyl radical(s) biases largely towards the latter. In this study, we demonstrate that such equilibrium is shifted by many factors, including temperature, chemical structures of fatty acid substrates and limited supply of oxygen. We also, for the first time, reveal that this equilibrium is significantly affected by co-substrates of POX. The presence of efficient POX co-substrates, which reduces heme to its ferric state, apparently biases the equilibrium towards arachidonyl radical. Therefore a dynamic interplay exists between the two activities of PGHS.
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Affiliation(s)
- Gang Wu
- Division of Hematology, Department of Internal Medicine, the University of Texas Health Science Center at Houston - McGovern Medical School, MSB 5.290, 6431 Fannin, Houston, TX 77030, USA
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24
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Kathiresan M, English AM. LC-MS/MS suggests that hole hopping in cytochrome c peroxidase protects its heme from oxidative modification by excess H 2O 2. Chem Sci 2017; 8:1152-1162. [PMID: 28451256 PMCID: PMC5369544 DOI: 10.1039/c6sc03125k] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2016] [Accepted: 09/06/2016] [Indexed: 12/20/2022] Open
Abstract
We recently reported that cytochrome c peroxidase (Ccp1) functions as a H2O2 sensor protein when H2O2 levels rise in respiring yeast. The availability of its reducing substrate, ferrocytochrome c (CycII), determines whether Ccp1 acts as a H2O2 sensor or peroxidase. For H2O2 to serve as a signal it must modify its receptor so we employed high-performance LC-MS/MS to investigate in detail the oxidation of Ccp1 by 1, 5 and 10 M eq. of H2O2 in the absence of CycII to prevent peroxidase activity. We observe strictly heme-mediated oxidation, implicating sequential cycles of binding and reduction of H2O2 at Ccp1's heme. This results in the incorporation of ∼20 oxygen atoms predominantly at methionine and tryptophan residues. Extensive intramolecular dityrosine crosslinking involving neighboring residues was uncovered by LC-MS/MS sequencing of the crosslinked peptides. The proximal heme ligand, H175, is converted to oxo-histidine, which labilizes the heme but irreversible heme oxidation is avoided by hole hopping to the polypeptide until oxidation of the catalytic distal H52 in Ccp1 treated with 10 M eq. of H2O2 shuts down heterolytic cleavage of H2O2 at the heme. Mapping of the 24 oxidized residues in Ccp1 reveals that hole hopping from the heme is directed to three polypeptide zones rich in redox-active residues. This unprecedented analysis unveils the remarkable capacity of a polypeptide to direct hole hopping away from its active site, consistent with heme labilization being a key outcome of Ccp1-mediated H2O2 signaling. LC-MS/MS identification of the oxidized residues also exposes the bias of electron paramagnetic resonance (EPR) detection toward transient radicals with low O2 reactivity.
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Affiliation(s)
- Meena Kathiresan
- Concordia University Faculty of Arts and Science, and PROTEOhttp://www.proteo.ca/index.html , Chemistry and Biochemistry , Montreal , Canada .
| | - Ann M English
- Concordia University Faculty of Arts and Science, and PROTEOhttp://www.proteo.ca/index.html , Chemistry and Biochemistry , Montreal , Canada .
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25
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Li LL, Yuan H, Liao F, He B, Gao SQ, Wen GB, Tan X, Lin YW. Rational design of artificial dye-decolorizing peroxidases using myoglobin by engineering Tyr/Trp in the heme center. Dalton Trans 2017; 46:11230-11238. [DOI: 10.1039/c7dt02302b] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Artificial dye-decolorizing peroxidases (DyPs) have been rationally designed using myoglobin (Mb) as a protein scaffold by engineering Tyr/Trp in the heme center, such as F43Y/F138 W Mb, which exhibited catalytic performance comparable to some native DyPs.
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Affiliation(s)
- Le-Le Li
- School of Chemistry and Chemical Engineering
- University of South China
- Hengyang 421001
- China
| | - Hong Yuan
- Department of Chemistry & Institute of Biomedical Science
- Fudan University
- Shanghai 200433
- China
| | - Fei Liao
- School of Chemistry and Chemical Engineering
- University of South China
- Hengyang 421001
- China
| | - Bo He
- School of Chemistry and Chemical Engineering
- University of South China
- Hengyang 421001
- China
| | - Shu-Qin Gao
- Laboratory of Protein Structure and Function
- University of South China
- Hengyang 421001
- China
| | - Ge-Bo Wen
- Laboratory of Protein Structure and Function
- University of South China
- Hengyang 421001
- China
| | - Xiangshi Tan
- Department of Chemistry & Institute of Biomedical Science
- Fudan University
- Shanghai 200433
- China
| | - Ying-Wu Lin
- School of Chemistry and Chemical Engineering
- University of South China
- Hengyang 421001
- China
- Laboratory of Protein Structure and Function
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26
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Liao F, Yuan H, Du KJ, You Y, Gao SQ, Wen GB, Lin YW, Tan X. Distinct roles of a tyrosine-associated hydrogen-bond network in fine-tuning the structure and function of heme proteins: two cases designed for myoglobin. MOLECULAR BIOSYSTEMS 2016; 12:3139-45. [PMID: 27476534 DOI: 10.1039/c6mb00537c] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A hydrogen-bond (H-bond) network, specifically a Tyr-associated H-bond network, plays key roles in regulating the structure and function of proteins, as exemplified by abundant heme proteins in nature. To explore an approach for fine-tuning the structure and function of artificial heme proteins, we herein used myoglobin (Mb) as a model protein and introduced a Tyr residue in the secondary sphere of the heme active site at two different positions (107 and 138). We performed X-ray crystallography, UV-Vis spectroscopy, stopped-flow kinetics, and electron paramagnetic resonance (EPR) studies for the two single mutants, I107Y Mb and F138Y Mb, and compared to that of wild-type Mb under the same conditions. The results showed that both Tyr107 and Tyr138 form a distinct H-bond network involving water molecules and neighboring residues, which fine-tunes ligand binding to the heme iron and enhances the protein stability, respectively. Moreover, the Tyr107-associated H-bond network was shown to fine-tune both H2O2 binding and activation. With two cases demonstrated for Mb, this study suggests that the Tyr-associated H-bond network has distinct roles in regulating the protein structure, properties and functions, depending on its location in the protein scaffold. Therefore, it is possible to design a Tyr-associated H-bond network in general to create other artificial heme proteins with improved properties and functions.
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Affiliation(s)
- Fei Liao
- School of Chemistry and Chemical Engineering, University of South China, Hengyang 421001, China.
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Engineering tyrosine electron transfer pathways decreases oxidative toxicity in hemoglobin: implications for blood substitute design. Biochem J 2016; 473:3371-83. [PMID: 27470146 PMCID: PMC5095908 DOI: 10.1042/bcj20160243] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2016] [Accepted: 07/25/2016] [Indexed: 11/17/2022]
Abstract
Hemoglobin (Hb)-based oxygen carriers (HBOC) have been engineered to replace or augment the oxygen-carrying capacity of erythrocytes. However, clinical results have generally been disappointing due to adverse side effects linked to intrinsic heme-mediated oxidative toxicity and nitric oxide (NO) scavenging. Redox-active tyrosine residues can facilitate electron transfer between endogenous antioxidants and oxidative ferryl heme species. A suitable residue is present in the α-subunit (Y42) of Hb, but absent from the homologous position in the β-subunit (F41). We therefore replaced this residue with a tyrosine (βF41Y, Hb Mequon). The βF41Y mutation had no effect on the intrinsic rate of lipid peroxidation as measured by conjugated diene and singlet oxygen formation following the addition of ferric(met) Hb to liposomes. However, βF41Y significantly decreased these rates in the presence of physiological levels of ascorbate. Additionally, heme damage in the β-subunit following the addition of the lipid peroxide hydroperoxyoctadecadieoic acid was five-fold slower in βF41Y. NO bioavailability was enhanced in βF41Y by a combination of a 20% decrease in NO dioxygenase activity and a doubling of the rate of nitrite reductase activity. The intrinsic rate of heme loss from methemoglobin was doubled in the β-subunit, but unchanged in the α-subunit. We conclude that the addition of a redox-active tyrosine mutation in Hb able to transfer electrons from plasma antioxidants decreases heme-mediated oxidative reactivity and enhances NO bioavailability. This class of mutations has the potential to decrease adverse side effects as one component of a HBOC product.
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28
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Wareham LK, Begg R, Jesse HE, Van Beilen JWA, Ali S, Svistunenko D, McLean S, Hellingwerf KJ, Sanguinetti G, Poole RK. Carbon Monoxide Gas Is Not Inert, but Global, in Its Consequences for Bacterial Gene Expression, Iron Acquisition, and Antibiotic Resistance. Antioxid Redox Signal 2016; 24:1013-28. [PMID: 26907100 PMCID: PMC4921903 DOI: 10.1089/ars.2015.6501] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
AIMS Carbon monoxide is a respiratory poison and gaseous signaling molecule. Although CO-releasing molecules (CORMs) deliver CO with temporal and spatial specificity in mammals, and are proven antimicrobial agents, we do not understand the modes of CO toxicity. Our aim was to explore the impact of CO gas per se, without intervention of CORMs, on bacterial physiology and gene expression. RESULTS We used tightly controlled chemostat conditions and integrated transcriptomic datasets with statistical modeling to reveal the global effects of CO. CO is known to inhibit bacterial respiration, and we found expression of genes encoding energy-transducing pathways to be significantly affected via the global regulators, Fnr, Arc, and PdhR. Aerobically, ArcA-the response regulator-is transiently phosphorylated and pyruvate accumulates, mimicking anaerobiosis. Genes implicated in iron acquisition, and the metabolism of sulfur amino acids and arginine, are all perturbed. The global iron-related changes, confirmed by modulation of activity of the transcription factor Fur, may underlie enhanced siderophore excretion, diminished intracellular iron pools, and the sensitivity of CO-challenged bacteria to metal chelators. Although CO gas (unlike H2S and NO) offers little protection from antibiotics, a ruthenium CORM is a potent adjuvant of antibiotic activity. INNOVATION This is the first detailed exploration of global bacterial responses to CO, revealing unexpected targets with implications for employing CORMs therapeutically. CONCLUSION This work reveals the complexity of bacterial responses to CO and provides a basis for understanding the impacts of CO from CORMs, heme oxygenase activity, or environmental sources. Antioxid. Redox Signal. 24, 1013-1028.
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Affiliation(s)
- Lauren K Wareham
- 1 Department of Molecular Biology and Biotechnology, The University of Sheffield , Sheffield, United Kingdom
| | - Ronald Begg
- 2 School of Informatics, The University of Edinburgh , Edinburgh, United Kingdom
| | - Helen E Jesse
- 1 Department of Molecular Biology and Biotechnology, The University of Sheffield , Sheffield, United Kingdom
| | - Johan W A Van Beilen
- 3 Molecular Microbial Physiology, Swammerdam Institute for Life Sciences, University of Amsterdam , Amsterdam, The Netherlands
| | - Salar Ali
- 1 Department of Molecular Biology and Biotechnology, The University of Sheffield , Sheffield, United Kingdom
| | - Dimitri Svistunenko
- 4 Biomedical EPR Facility, School of Biological Sciences, University of Essex , Colchester, United Kingdom
| | - Samantha McLean
- 1 Department of Molecular Biology and Biotechnology, The University of Sheffield , Sheffield, United Kingdom
| | - Klaas J Hellingwerf
- 3 Molecular Microbial Physiology, Swammerdam Institute for Life Sciences, University of Amsterdam , Amsterdam, The Netherlands
| | - Guido Sanguinetti
- 2 School of Informatics, The University of Edinburgh , Edinburgh, United Kingdom
| | - Robert K Poole
- 1 Department of Molecular Biology and Biotechnology, The University of Sheffield , Sheffield, United Kingdom
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29
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Spolitak T, Hollenberg PF, Ballou DP. Oxidative hemoglobin reactions: Applications to drug metabolism. Arch Biochem Biophys 2016; 600:33-46. [DOI: 10.1016/j.abb.2016.04.007] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2016] [Revised: 04/05/2016] [Accepted: 04/14/2016] [Indexed: 01/27/2023]
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Tejero J, Kapralov AA, Baumgartner MP, Sparacino-Watkins CE, Anthonymutu TS, Vlasova II, Camacho CJ, Gladwin MT, Bayir H, Kagan VE. Peroxidase activation of cytoglobin by anionic phospholipids: Mechanisms and consequences. BIOCHIMICA ET BIOPHYSICA ACTA 2016; 1861:391-401. [PMID: 26928591 PMCID: PMC4821708 DOI: 10.1016/j.bbalip.2016.02.022] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/18/2015] [Revised: 02/02/2016] [Accepted: 02/24/2016] [Indexed: 10/22/2022]
Abstract
Cytoglobin (Cygb) is a hexa-coordinated hemoprotein with yet to be defined physiological functions. The iron coordination and spin state of the Cygb heme group are sensitive to oxidation of two cysteine residues (Cys38/Cys83) and/or the binding of free fatty acids. However, the roles of redox vs lipid regulators of Cygb's structural rearrangements in the context of the protein peroxidase competence are not known. Searching for physiologically relevant lipid regulators of Cygb, here we report that anionic phospholipids, particularly phosphatidylinositolphosphates, affect structural organization of the protein and modulate its iron state and peroxidase activity both conjointly and/or independently of cysteine oxidation. Thus, different anionic lipids can operate in cysteine-dependent and cysteine-independent ways as inducers of the peroxidase activity. We establish that Cygb's peroxidase activity can be utilized for the catalysis of peroxidation of anionic phospholipids (including phosphatidylinositolphosphates) yielding mono-oxygenated molecular species. Combined with the computational simulations we propose a bipartite lipid binding model that rationalizes the modes of interactions with phospholipids, the effects on structural re-arrangements and the peroxidase activity of the hemoprotein.
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Affiliation(s)
- Jesús Tejero
- Heart, Lung, Blood, and Vascular Medicine Institute, University of Pittsburgh, Pittsburgh, PA 15213, USA; Division of Pulmonary, Allergy and Critical Care Medicine, University of Pittsburgh, Pittsburgh, PA 15213, USA.
| | - Alexandr A Kapralov
- Department of Environmental and Occupational Health, University of Pittsburgh, Pittsburgh, PA 15219, USA; Center for Free Radical and Antioxidant Health and Center for Medical Countermeasures against Radiation, University of Pittsburgh, Pittsburgh, PA 15219, USA
| | - Matthew P Baumgartner
- Department of Computational and Systems Biology, University of Pittsburgh, Pittsburgh, PA, USA
| | - Courtney E Sparacino-Watkins
- Heart, Lung, Blood, and Vascular Medicine Institute, University of Pittsburgh, Pittsburgh, PA 15213, USA; Division of Pulmonary, Allergy and Critical Care Medicine, University of Pittsburgh, Pittsburgh, PA 15213, USA
| | - Tamil S Anthonymutu
- Center for Free Radical and Antioxidant Health and Center for Medical Countermeasures against Radiation, University of Pittsburgh, Pittsburgh, PA 15219, USA; Department of Critical Care Medicine, Safar Center for Resuscitation Research, University of Pittsburgh, Pittsburgh, PA 15219, USA
| | - Irina I Vlasova
- Department of Environmental and Occupational Health, University of Pittsburgh, Pittsburgh, PA 15219, USA; Center for Free Radical and Antioxidant Health and Center for Medical Countermeasures against Radiation, University of Pittsburgh, Pittsburgh, PA 15219, USA
| | - Carlos J Camacho
- Department of Computational and Systems Biology, University of Pittsburgh, Pittsburgh, PA, USA.
| | - Mark T Gladwin
- Heart, Lung, Blood, and Vascular Medicine Institute, University of Pittsburgh, Pittsburgh, PA 15213, USA; Division of Pulmonary, Allergy and Critical Care Medicine, University of Pittsburgh, Pittsburgh, PA 15213, USA
| | - Hülya Bayir
- Department of Environmental and Occupational Health, University of Pittsburgh, Pittsburgh, PA 15219, USA; Center for Free Radical and Antioxidant Health and Center for Medical Countermeasures against Radiation, University of Pittsburgh, Pittsburgh, PA 15219, USA; Department of Critical Care Medicine, Safar Center for Resuscitation Research, University of Pittsburgh, Pittsburgh, PA 15219, USA.
| | - Valerian E Kagan
- Department of Environmental and Occupational Health, University of Pittsburgh, Pittsburgh, PA 15219, USA; Center for Free Radical and Antioxidant Health and Center for Medical Countermeasures against Radiation, University of Pittsburgh, Pittsburgh, PA 15219, USA; Department of Chemistry, University of Pittsburgh, Pittsburgh, PA 15219, USA; Department of Pharmacology and Chemical Biology, University of Pittsburgh, Pittsburgh, PA 15219, USA; Department of Radiation Oncology, University of Pittsburgh, Pittsburgh, PA 15219, USA.
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31
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Crack JC, Svistunenko DA, Munnoch J, Thomson AJ, Hutchings MI, Le Brun NE. Differentiated, Promoter-specific Response of [4Fe-4S] NsrR DNA Binding to Reaction with Nitric Oxide. J Biol Chem 2016; 291:8663-72. [PMID: 26887943 PMCID: PMC4861436 DOI: 10.1074/jbc.m115.693192] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2015] [Indexed: 12/19/2022] Open
Abstract
NsrR is an iron-sulfur cluster protein that regulates the nitric oxide (NO) stress response of many bacteria. NsrR from Streptomyces coelicolor regulates its own expression and that of only two other genes, hmpA1 and hmpA2, which encode HmpA enzymes predicted to detoxify NO. NsrR binds promoter DNA with high affinity only when coordinating a [4Fe-4S] cluster. Here we show that reaction of [4Fe-4S] NsrR with NO affects DNA binding differently depending on the gene promoter. Binding to the hmpA2 promoter was abolished at ∼2 NO per cluster, although for the hmpA1 and nsrR promoters, ∼4 and ∼8 NO molecules, respectively, were required to abolish DNA binding. Spectroscopic and kinetic studies of the NO reaction revealed a rapid, multi-phase, non-concerted process involving up to 8–10 NO molecules per cluster, leading to the formation of several iron-nitrosyl species. A distinct intermediate was observed at ∼2 NO per cluster, along with two further intermediates at ∼4 and ∼6 NO. The NsrR nitrosylation reaction was not significantly affected by DNA binding. These results show that NsrR regulates different promoters in response to different concentrations of NO. Spectroscopic evidence indicates that this is achieved by different NO-FeS complexes.
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Affiliation(s)
- Jason C Crack
- From the Centre for Molecular and Structural Biochemistry, School of Chemistry, and
| | - Dimitri A Svistunenko
- the School of Biological Sciences, University of Essex, Wivenhoe Park, Colchester CO4 3SQ, United Kingdom
| | - John Munnoch
- the School of Biological Sciences, University of East Anglia, Norwich Research Park, Norwich NR4 7TJ and
| | - Andrew J Thomson
- From the Centre for Molecular and Structural Biochemistry, School of Chemistry, and
| | - Matthew I Hutchings
- the School of Biological Sciences, University of East Anglia, Norwich Research Park, Norwich NR4 7TJ and
| | - Nick E Le Brun
- From the Centre for Molecular and Structural Biochemistry, School of Chemistry, and
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32
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O. Nwamba C, C. Chilaka F, Akbar Moosavi-Movahedi A. Cation modulation of hemoglobin interaction with sodium n-dodecyl sulphate (SDS) iv: magnesium modulation at pH 7.20. AIMS BIOPHYSICS 2016. [DOI: 10.3934/biophy.2016.1.146] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
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33
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Abstract
Thiyl radicals are important intermediates in the redox biology and chemistry of thiols. These radicals can react via hydrogen transfer with various C-H bonds in peptides and proteins, leading to the generation of carbon-centered radicals, and, potentially, to irreversible protein damage. This review summarizes quantitative information on reaction kinetics and product formation, and discusses the significance of these reactions for protein degradation induced by thiyl radical formation.
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Affiliation(s)
- Christian Schöneich
- a Department of Pharmaceutical Chemistry , The University of Kansas , Lawrence , KS 66047 , USA
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34
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Ferreira JC, Marcondes MF, Icimoto MY, Cardoso THS, Tofanello A, Pessoto FS, Miranda EGA, Prieto T, Nascimento OR, Oliveira V, Nantes IL. Intermediate Tyrosyl Radical and Amyloid Structure in Peroxide-Activated Cytoglobin. PLoS One 2015; 10:e0136554. [PMID: 26312997 PMCID: PMC4552303 DOI: 10.1371/journal.pone.0136554] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2015] [Accepted: 08/04/2015] [Indexed: 11/22/2022] Open
Abstract
We characterized the peroxidase mechanism of recombinant rat brain cytoglobin (Cygb) challenged by hydrogen peroxide, tert-butylhydroperoxide and by cumene hydroperoxide. The peroxidase mechanism of Cygb is similar to that of myoglobin. Cygb challenged by hydrogen peroxide is converted to a Fe4+ oxoferryl π cation, which is converted to Fe4+ oxoferryl and tyrosyl radical detected by direct continuous wave-electron paramagnetic resonance and by 3,5-dibromo-4-nitrosobenzene sulfonate spin trapping. When organic peroxides are used as substrates at initial reaction times, and given an excess of peroxide present, the EPR signals of the corresponding peroxyl radicals precede those of the direct tyrosyl radical. This result is consistent with the use of peroxide as a reducing agent for the recycling of Cygb high-valence species. Furthermore, we found that the Cygb oxidation by peroxides leads to the formation of amyloid fibrils. This result suggests that Cygb possibly participates in the development of degenerative diseases; our findings also support the possible biological role of Cygb related to peroxidase activity.
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Affiliation(s)
- Juliana C. Ferreira
- Departamento de Bioquímica, Universidade Federal de São Paulo, São Paulo, SP, Brazil
| | - Marcelo F. Marcondes
- Departamento de Bioquímica, Universidade Federal de São Paulo, São Paulo, SP, Brazil
| | - Marcelo Y. Icimoto
- Departamento de Bioquímica, Universidade Federal de São Paulo, São Paulo, SP, Brazil
| | - Thyago H. S. Cardoso
- Departamento de Bioquímica, Universidade Federal de São Paulo, São Paulo, SP, Brazil
| | - Aryane Tofanello
- Laboratório de Nanoestruturas para Biologia e Materiais Avançados, Centro de Ciências Naturais e Humanas, Universidade Federal do ABC, Santo André, SP, Brazil
| | - Felipe S. Pessoto
- Laboratório de Nanoestruturas para Biologia e Materiais Avançados, Centro de Ciências Naturais e Humanas, Universidade Federal do ABC, Santo André, SP, Brazil
| | - Erica G. A. Miranda
- Laboratório de Nanoestruturas para Biologia e Materiais Avançados, Centro de Ciências Naturais e Humanas, Universidade Federal do ABC, Santo André, SP, Brazil
| | - Tatiana Prieto
- Laboratório de Nanoestruturas para Biologia e Materiais Avançados, Centro de Ciências Naturais e Humanas, Universidade Federal do ABC, Santo André, SP, Brazil
- Grupo de Biofísica Molecular “Sérgio Mascarenhas,” Instituto de Física de São Carlos, Universidade de São Paulo, São Carlos, SP, Brazil
| | - Otaciro R. Nascimento
- Grupo de Biofísica Molecular “Sérgio Mascarenhas,” Instituto de Física de São Carlos, Universidade de São Paulo, São Carlos, SP, Brazil
| | - Vitor Oliveira
- Departamento de Bioquímica, Universidade Federal de São Paulo, São Paulo, SP, Brazil
| | - Iseli L. Nantes
- Departamento de Bioquímica, Universidade Federal de São Paulo, São Paulo, SP, Brazil
- Laboratório de Nanoestruturas para Biologia e Materiais Avançados, Centro de Ciências Naturais e Humanas, Universidade Federal do ABC, Santo André, SP, Brazil
- * E-mail:
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35
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The hydrogen-peroxide-induced radical behaviour in human cytochrome c-phospholipid complexes: implications for the enhanced pro-apoptotic activity of the G41S mutant. Biochem J 2015; 456:441-52. [PMID: 24099549 DOI: 10.1042/bj20130758] [Citation(s) in RCA: 70] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
We have investigated whether the pro-apoptotic properties of the G41S mutant of human cytochrome c can be explained by a higher than wild-type peroxidase activity triggered by phospholipid binding. A key complex in mitochondrial apoptosis involves cytochrome c and the phospholipid cardiolipin. In this complex cytochrome c has its native axial Met(80) ligand dissociated from the haem-iron, considerably augmenting the peroxidase capability of the haem group upon H2O2 binding. By EPR spectroscopy we reveal that the magnitude of changes in the paramagnetic haem states, as well as the yield of protein-bound free radical, is dependent on the phospholipid used and is considerably greater in the G41S mutant. A high-resolution X-ray crystal structure of human cytochrome c was determined and, in combination with the radical EPR signal analysis, two tyrosine residues, Tyr(46) and Tyr(48), have been rationalized to be putative radical sites. Subsequent single and double tyrosine-to-phenylalanine mutations revealed that the EPR signal of the radical, found to be similar in all variants, including G41S and wild-type, originates not from a single tyrosine residue, but is instead a superimposition of multiple EPR signals from different radical sites. We propose a mechanism of multiple radical formations in the cytochrome c-phospholipid complexes under H2O2 treatment, consistent with the stabilization of the radical in the G41S mutant, which elicits a greater peroxidase activity from cytochrome c and thus has implications in mitochondrial apoptosis.
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36
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Fang Z, Sampson SL, Warren RM, Gey van Pittius NC, Newton-Foot M. Iron acquisition strategies in mycobacteria. Tuberculosis (Edinb) 2015; 95:123-30. [PMID: 25636179 DOI: 10.1016/j.tube.2015.01.004] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2014] [Revised: 01/01/2015] [Accepted: 01/07/2015] [Indexed: 02/04/2023]
Abstract
Iron is an essential element to most life forms including mycobacterial species. However, in the oxidative atmosphere iron exists as insoluble salts. Free and soluble iron ions are scarce in both the extracellular and intracellular environment which makes iron assimilation very challenging to mycobacteria. Tuberculosis, caused by the pathogen, Mycobacterium tuberculosis, is one of the most infectious and deadly diseases in the world. Extensive studies regarding iron acquisition strategies have been documented in mycobacteria, including work on the mycobacterial iron chelators (siderophores), the iron-responsive regulon, and iron transport and utilization pathways. Under low iron conditions, expression of the genes encoding iron importers, exporters and siderophore biosynthetic enzymes is up-regulated significantly increasing the ability of the bacteria to acquire limited host iron. Disabling these proteins impairs the growth of mycobacteria under low iron conditions both in vitro and in vivo, and that of pathogenic mycobacteria in animal models. Drugs targeting siderophore-mediated iron transport could offer promising therapeutic options. However, the discovery and characterization of an alternative iron acquisition mechanism, the heme transport and utilization pathway, questions the effectiveness of the siderophore-centered therapeutic strategy. Links have been found between these two distinct iron acquisition mechanisms, thus, targeting a few candidate proteins or mechanisms may influence both pathways, leading to effective elimination of the bacteria in the host.
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Affiliation(s)
- Zhuo Fang
- DST/NRF Centre of Excellence in Biomedical Tuberculosis Research, US/MRC Centre for Molecular and Cellular Biology, Division of Molecular Biology and Human Genetics, Department of Biomedical Sciences, Faculty of Medicine and Health Sciences, University of Stellenbosch, Francie van Zijl Drive, Tygerberg, 7505, South Africa.
| | - Samantha Leigh Sampson
- DST/NRF Centre of Excellence in Biomedical Tuberculosis Research, US/MRC Centre for Molecular and Cellular Biology, Division of Molecular Biology and Human Genetics, Department of Biomedical Sciences, Faculty of Medicine and Health Sciences, University of Stellenbosch, Francie van Zijl Drive, Tygerberg, 7505, South Africa.
| | - Robin Mark Warren
- DST/NRF Centre of Excellence in Biomedical Tuberculosis Research, US/MRC Centre for Molecular and Cellular Biology, Division of Molecular Biology and Human Genetics, Department of Biomedical Sciences, Faculty of Medicine and Health Sciences, University of Stellenbosch, Francie van Zijl Drive, Tygerberg, 7505, South Africa.
| | - Nicolaas Claudius Gey van Pittius
- DST/NRF Centre of Excellence in Biomedical Tuberculosis Research, US/MRC Centre for Molecular and Cellular Biology, Division of Molecular Biology and Human Genetics, Department of Biomedical Sciences, Faculty of Medicine and Health Sciences, University of Stellenbosch, Francie van Zijl Drive, Tygerberg, 7505, South Africa.
| | - Mae Newton-Foot
- Division of Medical Microbiology, Department of Pathology, Faculty of Medicine and Health Sciences, University of Stellenbosch, Francie van Zijl Drive, Tygerberg, 7505, South Africa.
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37
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Morris JD, Khanal D, Richey JA, Payne CK. Hemoglobin-mediated synthesis of PEDOT:PSS: enhancing conductivity through biological oxidants. Biomater Sci 2015. [DOI: 10.1039/c4bm00338a] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Hemoglobin is used as an oxidant to generate highly conductive PEDOT:PSS with bipolarons, while catalase generates a less conductive polymer that possesses polarons.
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Affiliation(s)
- J. D. Morris
- School of Science and Technology
- Georgia Gwinnett College
- Lawrenceville
- USA
| | - D. Khanal
- School of Chemistry and Biochemistry
- Georgia Institute of Technology
- Atlanta
- USA
- Petit Institute for Bioengineering and Biosciences
| | - J. A. Richey
- School of Chemistry and Biochemistry
- Georgia Institute of Technology
- Atlanta
- USA
- Petit Institute for Bioengineering and Biosciences
| | - C. K. Payne
- School of Chemistry and Biochemistry
- Georgia Institute of Technology
- Atlanta
- USA
- Petit Institute for Bioengineering and Biosciences
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38
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Hicks TM, Verbeek CJR, Lay MC, Manley-Harris M. Changes to amino acid composition of bloodmeal after chemical oxidation. RSC Adv 2015. [DOI: 10.1039/c5ra10587k] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The effect of oxidative decolouring with peracetic acid on the physical and chemical characteristics of bloodmeal proteins was investigated by assessing protein solubility, molecular weight distribution and final amino acid composition.
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Affiliation(s)
- T. M. Hicks
- School of Engineering
- Faculty of Science and Engineering
- University of Waikato
- Hamilton 3240
- New Zealand
| | - C. J. R. Verbeek
- School of Engineering
- Faculty of Science and Engineering
- University of Waikato
- Hamilton 3240
- New Zealand
| | - M. C. Lay
- School of Engineering
- Faculty of Science and Engineering
- University of Waikato
- Hamilton 3240
- New Zealand
| | - M. Manley-Harris
- School of Science
- Faculty of Science and Engineering
- University of Waikato
- Hamilton 3240
- New Zealand
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39
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Yan DJ, Li W, Xiang Y, Wen GB, Lin YW, Tan X. A Novel Tyrosine-Heme CO Covalent Linkage in F43Y Myoglobin: A New Post-translational Modification of Heme Proteins. Chembiochem 2014; 16:47-50. [DOI: 10.1002/cbic.201402504] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2014] [Indexed: 12/18/2022]
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40
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Davydov R, Laryukhin M, Ledbetter-Rogers A, Sono M, Dawson JH, Hoffman BM. Electron paramagnetic resonance and electron-nuclear double resonance studies of the reactions of cryogenerated hydroperoxoferric-hemoprotein intermediates. Biochemistry 2014; 53:4894-903. [PMID: 25046203 PMCID: PMC4144713 DOI: 10.1021/bi500296d] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
![]()
The fleeting ferric peroxo and hydroperoxo
intermediates of dioxygen
activation by hemoproteins can be readily trapped and characterized
during cryoradiolytic reduction of ferrous hemoprotein–O2 complexes at 77 K. Previous cryoannealing studies suggested
that the relaxation of cryogenerated hydroperoxoferric intermediates
of myoglobin (Mb), hemoglobin, and horseradish peroxidase (HRP), either
trapped directly at 77 K or generated by cryoannealing of a trapped
peroxo-ferric state, proceeds through dissociation of bound H2O2 and formation of the ferric heme without formation
of the ferryl porphyrin π-cation radical intermediate, compound
I (Cpd I). Herein we have reinvestigated the mechanism of decays of
the cryogenerated hydroperoxyferric intermediates of α- and
β-chains of human hemoglobin, HRP, and chloroperoxidase (CPO).
The latter two proteins are well-known to form spectroscopically detectable
quasistable Cpds I. Peroxoferric intermediates are trapped during
77 K cryoreduction of oxy Mb, α-chains, and β-chains of
human hemoglobin and CPO. They convert into hydroperoxoferric intermediates
during annealing at temperatures above 160 K. The hydroperoxoferric
intermediate of HRP is trapped directly at 77 K. All studied hydroperoxoferric
intermediates decay with measurable rates at temperatures above 170
K with appreciable solvent kinetic isotope effects. The hydroperoxoferric
intermediate of β-chains converts to the S =
3/2 Cpd I, which in turn decays to an electron paramagnetic resonance
(EPR)-silent product at temperature above 220 K. For all the other
hemoproteins studied, cryoannealing of the hydroperoxo intermediate
directly yields an EPR-silent majority product. In each case, a second
follow-up 77 K γ-irradiation of the annealed samples yields
low-spin EPR signals characteristic of cryoreduced ferrylheme (compound
II, Cpd II). This indicates that in general the hydroperoxoferric
intermediates relax to Cpd I during cryoanealing at low temperatures,
but when this state is not captured by reaction with a bound substrate,
it is reduced to Cpd II by redox-active products of radiolysis.
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Affiliation(s)
- Roman Davydov
- Department of Chemistry, Northwestern University , 2145 Sheridan Road, Evanston, Illinois 60208-3113, United States
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41
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Sanz V, de Marcos S, Galbán J. Analytical applications of the optical properties of ferric hemoglobin: A theoretical and experimental study. Microchem J 2014. [DOI: 10.1016/j.microc.2013.12.016] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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42
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Solomon EI, Heppner DE, Johnston EM, Ginsbach JW, Cirera J, Qayyum M, Kieber-Emmons MT, Kjaergaard CH, Hadt RG, Tian L. Copper active sites in biology. Chem Rev 2014; 114:3659-853. [PMID: 24588098 PMCID: PMC4040215 DOI: 10.1021/cr400327t] [Citation(s) in RCA: 1138] [Impact Index Per Article: 113.8] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
| | - David E. Heppner
- Department of Chemistry, Stanford University, Stanford, CA, 94305
| | | | - Jake W. Ginsbach
- Department of Chemistry, Stanford University, Stanford, CA, 94305
| | - Jordi Cirera
- Department of Chemistry, Stanford University, Stanford, CA, 94305
| | - Munzarin Qayyum
- Department of Chemistry, Stanford University, Stanford, CA, 94305
| | | | | | - Ryan G. Hadt
- Department of Chemistry, Stanford University, Stanford, CA, 94305
| | - Li Tian
- Department of Chemistry, Stanford University, Stanford, CA, 94305
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Lu N, He Y, Chen C, Tian R, Xiao Q, Peng YY. Tyrosine can protect against oxidative stress through ferryl hemoglobin reduction. Toxicol In Vitro 2014; 28:847-55. [PMID: 24698734 DOI: 10.1016/j.tiv.2014.03.014] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2013] [Revised: 02/19/2014] [Accepted: 03/21/2014] [Indexed: 10/25/2022]
Abstract
The toxic mechanism of hemoglobin (Hb) under oxidative stress is linked to the formations of highly cytotoxic ferryl species and subsequently heme-to-protein cross-linked derivative of Hb (Hb-X). In this study, we have examined the effects of free tyrosine and its analogues (3-chlorotyrosine, phenylalanine) on the stability of ferryl hemoglobin and the formation of Hb-X. The results showed that free tyrosine (not phenylalanine, 10-500 μM) was an efficient reducing agent of ferryl species and also effective at preventing the formation of cytotoxic Hb-X. Meanwhile, the dimeric tyrosine was formed as the oxidation product of tyrosine during Hb redox reaction. Compared with free tyrosine, 3-chlorotyrosine, an oxidation product of tyrosine and a proposed biomarker for hypochlorous acid (HOCl) in vivo, exhibited stronger antioxidant properties in Hb-induced oxidative stress, which was consistent with its more efficient ability in the reduction of ferryl species. These results showed that the presence of tyrosine and its derivative in vivo and vitro could ameliorate oxidative damage through ferryl heme reduction. The antioxidant ability, therefore, may provide new insights into the nutritional and physiological significance of free tyrosine with redox active heme proteins-related oxidative stress.
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Affiliation(s)
- Naihao Lu
- Jiangxi Key Laboratory of Functional Organic Molecules, Jiangxi Science and Technology Normal University, Nanchang 330013, China; Key Laboratory of Functional Small Organic Molecule, Ministry of Education and College of Life Science, Jiangxi Normal University, 99 Ziyang Road, Nanchang, Jiangxi 330022, China.
| | - Yingjie He
- Key Laboratory of Functional Small Organic Molecule, Ministry of Education and College of Life Science, Jiangxi Normal University, 99 Ziyang Road, Nanchang, Jiangxi 330022, China; Key Laboratory of Green Chemistry, Jiangxi Province and College of Chemistry and Chemical Engineering, Jiangxi Normal University, 99 Ziyang Road, Nanchang, Jiangxi 330022, China
| | - Chao Chen
- Key Laboratory of Functional Small Organic Molecule, Ministry of Education and College of Life Science, Jiangxi Normal University, 99 Ziyang Road, Nanchang, Jiangxi 330022, China
| | - Rong Tian
- Key Laboratory of Green Chemistry, Jiangxi Province and College of Chemistry and Chemical Engineering, Jiangxi Normal University, 99 Ziyang Road, Nanchang, Jiangxi 330022, China
| | - Qiang Xiao
- Jiangxi Key Laboratory of Functional Organic Molecules, Jiangxi Science and Technology Normal University, Nanchang 330013, China.
| | - Yi-Yuan Peng
- Key Laboratory of Functional Small Organic Molecule, Ministry of Education and College of Life Science, Jiangxi Normal University, 99 Ziyang Road, Nanchang, Jiangxi 330022, China; Key Laboratory of Green Chemistry, Jiangxi Province and College of Chemistry and Chemical Engineering, Jiangxi Normal University, 99 Ziyang Road, Nanchang, Jiangxi 330022, China
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Mollan TL, Jia Y, Banerjee S, Wu G, Kreulen RT, Tsai AL, Olson JS, Crumbliss AL, Alayash AI. Redox properties of human hemoglobin in complex with fractionated dimeric and polymeric human haptoglobin. Free Radic Biol Med 2014; 69:265-77. [PMID: 24486321 PMCID: PMC4104362 DOI: 10.1016/j.freeradbiomed.2014.01.030] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/25/2013] [Revised: 01/22/2014] [Accepted: 01/23/2014] [Indexed: 12/30/2022]
Abstract
Haptoglobin (Hp) is an abundant and conserved plasma glycoprotein, which binds acellular adult hemoglobin (Hb) dimers with high affinity and facilitates their rapid clearance from circulation after hemolysis. Humans possess three main phenotypes of Hp, designated Hp 1-1, Hp 2-1, and Hp 2-2. These variants exhibit diverse structural configurations and have been reported to be functionally nonequivalent. We have investigated the functional and redox properties of Hb-Hp complexes prepared using commercially fractionated Hp and found that all forms exhibit similar behavior. The rate of Hb dimer binding to Hp occurs with bimolecular rate constants of ~0.9 μM(-1) s(-1), irrespective of the type of Hp assayed. Although Hp binding does accelerate the observed rate of HbO2 autoxidation by dissociating Hb tetramers into dimers, the rate observed for these bound dimers is three- to fourfold slower than that of Hb dimers free in solution. Co-incubation of ferric Hb with any form of Hp inhibits heme loss to below detectable levels. Intrinsic redox potentials (E1/2) of the ferric/ferrous pair of each Hb-Hp complex are similar, varying from +54 to +59 mV (vs NHE), and are essentially the same as reported by us previously for Hb-Hp complexes prepared from unfractionated Hp. All Hb-Hp complexes generate similar high amounts of ferryl Hb after exposure to hydrogen peroxide. Electron paramagnetic resonance data indicate that the yields of protein-based radicals during this process are approximately 4 to 5% and are unaffected by the variant of Hp assayed. These data indicate that the Hp fractions examined are equivalent to one another with respect to Hb binding and associated stability and redox properties and that this result should be taken into account in the design of phenotype-specific Hp therapeutics aimed at countering Hb-mediated vascular disease.
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Affiliation(s)
- Todd L Mollan
- Laboratory of Biochemistry and Vascular Biology, Division of Hematology, Center for Biologics Evaluation and Research, Food and Drug Administration, Bethesda, MD 20852, USA
| | - Yiping Jia
- Laboratory of Biochemistry and Vascular Biology, Division of Hematology, Center for Biologics Evaluation and Research, Food and Drug Administration, Bethesda, MD 20852, USA
| | | | - Gang Wu
- Hematology Division, Department of Internal Medicine, University of Texas-Houston Medical School, Houston, TX 77030, USA
| | | | - Ah-Lim Tsai
- Hematology Division, Department of Internal Medicine, University of Texas-Houston Medical School, Houston, TX 77030, USA
| | - John S Olson
- Biochemistry and Cell Biology Department, Rice University, Houston, TX 77251, USA
| | | | - Abdu I Alayash
- Laboratory of Biochemistry and Vascular Biology, Division of Hematology, Center for Biologics Evaluation and Research, Food and Drug Administration, Bethesda, MD 20852, USA.
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Libardi SH, Skibsted LH, Cardoso DR. Oxidation of carbon monoxide by perferrylmyoglobin. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2014; 62:1950-5. [PMID: 24506496 DOI: 10.1021/jf4053176] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Perferrylmyoglobin is found to oxidize CO in aerobic aqueous solution to CO2. Tryptophan hydroperoxide in the presence of tetra(4-sulfonatophenyl)-porphyrinate-iron(III) or simple iron(II)/(III) salts shows similar reactivity against CO. The oxidation of CO is for tryptophan hydroperoxide concluded to depend on the formation of alkoxyl radicals by reductive cleavage by iron(II) or on the formation of peroxyl radicals by oxidative cleavage by iron(III). During oxidation of CO, the tryptophan peroxyl radical was depleted with a rate constant of 0.26 ± 0.01 s(-1) for CO-saturated aqueous solution of pH 7.4 at 25 °C without concomitant reduction of the iron(IV) center. Carbon monoxide is as a natural metabolite accordingly capable of scavenging tryptophan radicals in myoglobin activated by peroxides with a second-order rate constant of (3.3 ± 0.6) × 10(2) L mol(-1) s(-1), a reaction that might be of importance in cellular membranes of the intestine for protection of tissue against radical damage during meat digestion.
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Affiliation(s)
- Silvia H Libardi
- Instituto de Quı́mica de São Carlos, Universidade de São Paulo , Av. Trabalhador São Carlense 400, CP 780, CEP 13560-970 São Carlos, SP, Brazil
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Hicks TM, Verbeek CJR, Lay MC, Manley-Harris M. The Role of Peracetic Acid in Bloodmeal Decoloring. J AM OIL CHEM SOC 2013. [DOI: 10.1007/s11746-013-2304-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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47
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Protein-based blood substitutes: recent attempts at controlling pro-oxidant reactivity with and beyond hemoglobin. Pharmaceuticals (Basel) 2013; 6:867-80. [PMID: 24276319 PMCID: PMC3816705 DOI: 10.3390/ph6070867] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2013] [Accepted: 06/26/2013] [Indexed: 12/03/2022] Open
Abstract
Reviewed here are recent attempts to produce protein-based artificial oxygen carriers (“blood substitutes”). Most of these involve chemical or physical modifications on hemoglobin, although a recent line of research using hemerythrin instead of hemoglobin is also described. The focus is set on the extent to which these modifications alter the redox reactivity of the proteins, and on ways in which this can be done systematically and purposefully, within the framework of a working hypothesis where redox side-reactions hold an important role in the physiological outcome of experimental transfusions with artificial oxygen carriers.
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Cooper CE, Schaer DJ, Buehler PW, Wilson MT, Reeder BJ, Silkstone G, Svistunenko DA, Bulow L, Alayash AI. Haptoglobin binding stabilizes hemoglobin ferryl iron and the globin radical on tyrosine β145. Antioxid Redox Signal 2013; 18:2264-73. [PMID: 22702311 PMCID: PMC3638561 DOI: 10.1089/ars.2012.4547] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
AIM Hemoglobin (Hb) becomes toxic when released from the erythrocyte. The acute phase protein haptoglobin (Hp) binds avidly to Hb and decreases oxidative damage to Hb itself and to the surrounding proteins and lipids. However, the molecular mechanism underpinning Hp protection is to date unclear. The aim of this study was to use electron paramagnetic resonance (EPR) spectroscopy, stopped flow optical spectrophotometry, and site-directed mutagenesis to explore the mechanism and specifically the role of specific tyrosine residues in this protection. RESULTS Following peroxide challenge Hb produces reactive oxidative intermediates in the form of ferryl heme and globin free radicals. Hp binding increases the steady state level of ferryl formation during Hb-catalyzed lipid peroxidation, while at the same time dramatically inhibiting the overall reaction rate. This enhanced ferryl stability is also seen in the absence of lipids and in the presence of external reductants. Hp binding is not accompanied by a decrease in the pK of ferryl protonation; the protonated ferryl species still forms, but is intrinsically less reactive. Ferryl stabilization is accompanied by a significant increase in the concentration of the peroxide-induced tyrosine free radical. EPR spectral parameters and mutagenesis studies suggest that this radical is located on tyrosine 145, the penultimate C-terminal amino acid on the beta Hb subunit. INNOVATION Hp binding decreases both the ferryl iron and free radical reactivity of Hb. CONCLUSION Hp protects against Hb-induced damage in the vasculature, not by preventing the primary reactivity of heme oxidants, but by rendering the resultant protein products less damaging.
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Affiliation(s)
- Chris E Cooper
- School of Biological Sciences, University of Essex, Essex, United Kingdom.
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49
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Comparison of methods for visualizing blood on dark surfaces. Sci Justice 2013; 53:178-86. [DOI: 10.1016/j.scijus.2012.09.001] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/05/2011] [Revised: 08/06/2012] [Accepted: 09/03/2012] [Indexed: 11/23/2022]
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50
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Dickson CF, Rich AM, D'Avigdor WMH, Collins DAT, Lowry JA, Mollan TL, Khandros E, Olson JS, Weiss MJ, Mackay JP, Lay PA, Gell DA. α-Hemoglobin-stabilizing protein (AHSP) perturbs the proximal heme pocket of oxy-α-hemoglobin and weakens the iron-oxygen bond. J Biol Chem 2013; 288:19986-20001. [PMID: 23696640 DOI: 10.1074/jbc.m112.437509] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
α-Hemoglobin (αHb)-stabilizing protein (AHSP) is a molecular chaperone that assists hemoglobin assembly. AHSP induces changes in αHb heme coordination, but how these changes are facilitated by interactions at the αHb·AHSP interface is not well understood. To address this question we have used NMR, x-ray absorption spectroscopy, and ligand binding measurements to probe αHb conformational changes induced by AHSP binding. NMR chemical shift analyses of free CO-αHb and CO-αHb·AHSP indicated that the seven helical elements of the native αHb structure are retained and that the heme Fe(II) remains coordinated to the proximal His-87 side chain. However, chemical shift differences revealed alterations of the F, G, and H helices and the heme pocket of CO-αHb bound to AHSP. Comparisons of iron-ligand geometry using extended x-ray absorption fine structure spectroscopy showed that AHSP binding induces a small 0.03 Å lengthening of the Fe-O2 bond, explaining previous reports that AHSP decreases αHb O2 affinity roughly 4-fold and promotes autooxidation due primarily to a 3-4-fold increase in the rate of O2 dissociation. Pro-30 mutations diminished NMR chemical shift changes in the proximal heme pocket, restored normal O2 dissociation rate and equilibrium constants, and reduced O2-αHb autooxidation rates. Thus, the contacts mediated by Pro-30 in wild-type AHSP promote αHb autooxidation by introducing strain into the proximal heme pocket. As a chaperone, AHSP facilitates rapid assembly of αHb into Hb when βHb is abundant but diverts αHb to a redox resistant holding state when βHb is limiting.
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Affiliation(s)
- Claire F Dickson
- Menzies Research Institute Tasmania, University of Tasmania, Hobart, TAS 7000, Australia
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