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Ascenzi P, De Simone G, Tundo GR, Coletta M. Kinetics of cyanide and carbon monoxide dissociation from ferrous human haptoglobin:hemoglobin(II) complexes. J Biol Inorg Chem 2020; 25:351-360. [DOI: 10.1007/s00775-020-01766-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2019] [Accepted: 02/12/2020] [Indexed: 12/17/2022]
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2
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Mirts EN, Petrik ID, Hosseinzadeh P, Nilges MJ, Lu Y. A designed heme-[4Fe-4S] metalloenzyme catalyzes sulfite reduction like the native enzyme. Science 2018; 361:1098-1101. [PMID: 30213908 DOI: 10.1126/science.aat8474] [Citation(s) in RCA: 83] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2018] [Accepted: 07/25/2018] [Indexed: 01/17/2023]
Abstract
Multielectron redox reactions often require multicofactor metalloenzymes to facilitate coupled electron and proton movement, but it is challenging to design artificial enzymes to catalyze these important reactions, owing to their structural and functional complexity. We report a designed heteronuclear heme-[4Fe-4S] cofactor in cytochrome c peroxidase as a structural and functional model of the enzyme sulfite reductase. The initial model exhibits spectroscopic and ligand-binding properties of the native enzyme, and sulfite reduction activity was improved-through rational tuning of the secondary sphere interactions around the [4Fe-4S] and the substrate-binding sites-to be close to that of the native enzyme. By offering insight into the requirements for a demanding six-electron, seven-proton reaction that has so far eluded synthetic catalysts, this study provides strategies for designing highly functional multicofactor artificial enzymes.
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Affiliation(s)
- Evan N Mirts
- Center for Biophysics and Quantitative Biology, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
| | - Igor D Petrik
- Department of Chemistry, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
| | - Parisa Hosseinzadeh
- Department of Biochemistry, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
| | - Mark J Nilges
- School of Chemical Sciences Electron Paramagnetic Resonance Lab, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
| | - Yi Lu
- Center for Biophysics and Quantitative Biology, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA. .,Department of Chemistry, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA.,Department of Biochemistry, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA.,Carl R. Woese Institute for Genomic Biology, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA.,DOE Center for Advanced Bioenergy and Bioproducts Innovation, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA.,Pacific Northwest National Laboratory, Richland, WA 99352, USA
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3
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Ascenzi P, Sbardella D, Santucci R, Coletta M. Cyanide binding to ferrous and ferric microperoxidase-11. J Biol Inorg Chem 2016; 21:511-22. [DOI: 10.1007/s00775-016-1361-z] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2016] [Accepted: 05/09/2016] [Indexed: 10/21/2022]
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Ascenzi P, Leboffe L, Polticelli F. Cyanide binding to human plasma heme-hemopexin: a comparative study. Biochem Biophys Res Commun 2012; 428:239-244. [PMID: 23068104 DOI: 10.1016/j.bbrc.2012.10.027] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2012] [Accepted: 10/05/2012] [Indexed: 06/01/2023]
Abstract
Hemopexin (HPX) displays a pivotal role in heme scavenging and delivery to the liver. In turn, heme-Fe-hemopexin (HPX-heme-Fe) displays heme-based spectroscopic and reactivity properties. Here, kinetics and thermodynamics of cyanide binding to ferric and ferrous hexa-coordinate human plasma HPX-heme-Fe (HHPX-heme-Fe(III) and HHPX-heme-Fe(II), respectively), and for the dithionite-mediated reduction of the HHPX-heme-Fe(III)-cyanide complex, at pH 7.4 and 20.0°C, are reported. Values of thermodynamic and kinetic parameters for cyanide binding to HHPX-heme-Fe(III) and HHPX-heme-Fe(II) are K = (4.1 ± 0.4) × 10(-6) M, k(on) = (6.9 ± 0.5) × 10(1) M(-1) s(-1), and k(off) = 2.8 × 10(-4) s(-1); and H = (6 ± 1) × 10(-1) M, h(on) = 1.2 × 10(-1) M(-1) s(-1), and h(off) = (7.1 ± 0.8) × 10(-2) s(-1), respectively. The value of the rate constant for the dithionite-mediated reduction of the HHPX-heme-Fe(III)-cyanide complex is l = 8.9 ± 0.8 M(-1/2) s(-1). HHPX-heme-Fe reactivity is modulated by proton acceptor/donor amino acid residue(s) (e.g., His236) assisting the deprotonation and protonation of the incoming and outgoing ligand, respectively.
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Affiliation(s)
- Paolo Ascenzi
- Laboratorio Interdipartimentale di Microscopia Elettronica, Università Roma Tre, Roma, Italy.
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Nothnagel HJ, Winer BY, Vuletich DA, Pond MP, Lecomte JTJ. Structural properties of 2/2 hemoglobins: the group III protein from Helicobacter hepaticus. IUBMB Life 2011; 63:197-205. [PMID: 21445851 DOI: 10.1002/iub.430] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
The ε-proteobacterium Helicobacter hepaticus (Hh) contains a gene coding for a hemoglobin (Hb). The protein belongs to the 2/2 Hb lineage and is representative of group III, a set of Hbs about which little is known. An expression and purification procedure was developed for Hh Hb. Electronic absorption and nuclear magnetic resonance (NMR) spectra were used to characterize ligation states of the ferric and ferrous protein. The pK(a) of the acid/alkaline transition of ferric Hh Hb was 7.3, an unusually low value. NMR analysis of the cyanomet complex showed the orientation of the heme group to be reversed when compared with most group I and group II 2/2 Hbs. Ferrous Hh Hb formed a stable cyanide complex that yielded NMR spectra similar to those of the carbonmonoxy complex. All forms of Hh Hb were self-associated at NMR concentrations. Comparison was made to the related Campylobacter jejuni 2/2 Hb (Ctb), and the amino acid conservation pattern of group III was reinspected to help in the generalization of structure-function relationships.
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Affiliation(s)
- Henry J Nothnagel
- T.C. Jenkins Department of Biophysics, Johns Hopkins University, Baltimore, MD, USA
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Observation of fast release of NO from ferrous d₁ haem allows formulation of a unified reaction mechanism for cytochrome cd₁ nitrite reductases. Biochem J 2011; 435:217-25. [PMID: 21244362 DOI: 10.1042/bj20101615] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Cytochrome cd1 nitrite reductase is a haem-containing enzyme responsible for the reduction of nitrite into NO, a key step in the anaerobic respiratory process of denitrification. The active site of cytochrome cd1 contains the unique d1 haem cofactor, from which NO must be released. In general, reduced haems bind NO tightly relative to oxidized haems. In the present paper, we present experimental evidence that the reduced d1 haem of cytochrome cd1 from Paracoccus pantotrophus releases NO rapidly (k=65-200 s(-1)); this result suggests that NO release is the rate-limiting step of the catalytic cycle (turnover number=72 s(-1)). We also demonstrate, using a complex of the d1 haem and apomyoglobin, that the rapid dissociation of NO is largely controlled by the d1 haem cofactor itself. We present a reaction mechanism proposed to be applicable to all cytochromes cd1 and conclude that the d1 haem has evolved to have low affinity for NO, as compared with other ferrous haems.
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Li J, Noll BC, Schulz CE, Scheidt WR. Comparison of cyanide and carbon monoxide as ligands in iron(II) porphyrinates. Angew Chem Int Ed Engl 2009; 48:5010-3. [PMID: 19492380 DOI: 10.1002/anie.200901434] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Spot the difference: The five-coordinate iron(II) cyanoporphyrinates, which are spin-crossover compounds, can be used to synthesize previously unknown six-coordinate complexes. Bis(cyano) and (cyano)imidazole complexes are presented, and the five- and six-coordinate (cyano)iron(II) derivatives are compared with analogous CO complexes.
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Affiliation(s)
- Jianfeng Li
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, IN 46556, USA
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Li J, Noll B, Schulz C, Scheidt W. Comparison of Cyanide and Carbon Monoxide as Ligands in Iron(II) Porphyrinates. Angew Chem Int Ed Engl 2009. [DOI: 10.1002/ange.200901434] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Li J, Lord RL, Noll BC, Baik MH, Schulz CE, Scheidt WR. Cyanide: a strong-field ligand for ferrohemes and hemoproteins? Angew Chem Int Ed Engl 2009; 47:10144-6. [PMID: 18989877 DOI: 10.1002/anie.200804116] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Jianfeng Li
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, USA
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Li J, Lord R, Noll B, Baik MH, Schulz C, Scheidt W. Cyanide: A Strong-Field Ligand for Ferrohemes and Hemoproteins? Angew Chem Int Ed Engl 2008. [DOI: 10.1002/ange.200804116] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Bidwai AK, Ok EY, Erman JE. pH dependence of cyanide binding to the ferric heme domain of the direct oxygen sensor from Escherichia coli and the effect of alkaline denaturation. Biochemistry 2008; 47:10458-70. [PMID: 18771281 DOI: 10.1021/bi800872d] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The spectrum of the ferric heme domain of the direct oxygen sensor protein from Escherichia coli ( EcDosH) has been measured between pH 3.0 and 12.6. EcDosH undergoes acid denaturation with an apparent p K a of 4.24 +/- 0.05 and a Hill coefficient of 3.1 +/- 0.6 and reversible alkaline denaturation with a p K a of 9.86 +/- 0.04 and a Hill coefficient of 1.1 +/- 0.1. Cyanide binding to EcDosH has been investigated between pH 4 and 11. The EcDosH-cyanide complex is most stable at pH 9 with a K D of 0.29 +/- 0.06 microM. The kinetics of cyanide binding are monophasic between pH 4 and 8. At pH >or=8.5, the reaction is biphasic with the fast phase dependent upon the cyanide concentration and the slow phase independent of cyanide. The slow phase is attributed to conversion of denatured EcDosH to the native state, with a pH-independent rate of 0.052 +/- 0.006 s (-1). The apparent association rate constant for cyanide binding to EcDosH increases from 3.6 +/- 0.1 M (-1) s (-1) at pH 4 to 520 +/- 20 M (-1) s (-1) at pH 11. The dissociation rate constant averages (8.6 +/- 1.3) x 10 (-5) s (-1) between pH 5 and 9, increasing to (1.4 +/- 0.1) x 10 (-3) s (-1) at pH 4 and (2.5 +/- 0.1) x 10 (-3) s (-1) at pH 12.2. The mechanism of cyanide binding is consistent with preferential binding of the cyanide anion to native EcDosH. The reactions of imidazole and H 2O 2 with ferric EcDosH were also investigated and show little reactivity.
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Affiliation(s)
- Anil K Bidwai
- Department of Chemistry and Biochemistry, Northern Illinois University, DeKalb, Illinois 60115, USA
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Bolli A, Ciaccio C, Coletta M, Nardini M, Bolognesi M, Pesce A, Guertin M, Visca P, Ascenzi P. Ferrous Campylobacter jejuni truncated hemoglobin P displays an extremely high reactivity for cyanide - a comparative study. FEBS J 2008; 275:633-45. [DOI: 10.1111/j.1742-4658.2007.06223.x] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Laterreur J, English AM. Hemoglobin S-nitrosation on oxygenation of nitrite/deoxyhemoglobin incubations is attenuated by methemoglobin. J Inorg Biochem 2007; 101:1827-35. [PMID: 17889368 DOI: 10.1016/j.jinorgbio.2007.07.021] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2007] [Revised: 07/15/2007] [Accepted: 07/16/2007] [Indexed: 11/24/2022]
Abstract
Nitrite is present in red blood cells (RBCs) and is proposed to be the largest intravascular storage pool of vasoactive NO. The mechanism by which nitrite exerts NO vasoactivity remains unclear but deoxyHb exhibits nitrite reductase activity. NitrosylHb (HbFe(II)NO) is formed on nitrite reduction by excess deoxyHb, and S-nitrosated Hb (HbSNO) has also been detected in nitrite/deoxyHb incubations. We report data consistent with efficient HbSNO generation from a nitrosylHb intermediate on oxygenation of anaerobic deoxyHb incubations containing physiologically revelant levels of nitrite, whereas previously a labile nitrosylmetHb (HbFe(III)NO) transient was proposed. The HbSNO yield as a function of the initial nitrite concentration varies with the nitrite/deoxyHb ratio, the incubation time, the concentration of added metHb (a nitrite trap), and the concentration of added cyanide (a strong metHb ligand). Our results reveal that metHb strongly attenuates HbSNO formation, which suggests that the met protein may play a regulatory role by limiting the amount of free (or non-Hb-bound) nitrite within RBCs to prevent hypotension.
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Affiliation(s)
- Julie Laterreur
- Department of Chemistry and Biochemistry, Concordia University, 7141 Sherbrooke West, Montreal, QC, Canada H4B 1R6
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Rashid AK, Weber RE. Functional differentiation in trematode hemoglobin isoforms. EUROPEAN JOURNAL OF BIOCHEMISTRY 1999; 260:717-25. [PMID: 10103000 DOI: 10.1046/j.1432-1327.1999.00194.x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
The Hbs and the major electrophoretic Hb components (isoHbs) were isolated from three species of the trematodes, Explanatum explanatum (Ee), Gastrothylax crumenifer (Gc) and Paramphistomum epiclitum (Pe), that parasitise the common Indian water buffalo Bubalus bubalis. The Hbs are monomeric and resemble the so-called nonfunctional mutant hemoglobins that have Tyr at B10 or E7 positions (replacing Leu and the His residues, respectively). However, they are capable of binding with O2 and CO. O2 equilibrium studies of trematode Hb isoforms reveal extremely high O2 affinities, with half-saturation O2 tension (P50) values up to 800 times lower than those of human hemoglobins. This correlates with Tyr residues at B10 and at the distal position (E7) that decrease the O2 dissociation rate by contributing hydrogen bonds (H-bonds) to the bound O2. These substitutions also increase the O2 association rates either due to orientation of E7-Tyr towards the solvent and/or by sterically hindering the entry of water molecules into the heme pocket. The latter may account for the low rate of autoxidation of trematode Hbs. The Hbs and their isoforms from different species exhibited pronounced variation in O2 affinity, which may relate to subtle differences in the structure of the heme pocket. The O2 affinities of the composite (unfractionated) Hbs were intermediate to those of the individual Hb isoform. The P50 values of Hbs here obtained by direct O2 equilibrium measurements differed from those calculated from kinetic data already published [Kiger, L., Rashid, A. K., Griffon, N., Haque, M., Moens, L.,Gibson, Q. H., Poyart, C., & Marden, M. C. (1998). Biophys. J. 75, 990-998.] Intermediate state(s) due to slow reorientation of E7-Tyr may account for this difference. Some Hb isoforms showed slight (either normal or reverse) Bohr effects. The hyperbolic O2 equilibrium curve, Hill coefficient (n) values near unity accord with a monomeric nature of trematode Hbs. In marked contrast to vertebrate Hbs, CO does not seem to compete effectively with O2 in trematode Hbs, as evident from partition coefficient values (M) below 1.
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Affiliation(s)
- A K Rashid
- Danish Center for Respiratory Adaptation (CRA), Department of Zoophysiology, Institute of Biological Sciences, Denmark
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Bolognesi M, Bordo D, Rizzi M, Tarricone C, Ascenzi P. Nonvertebrate hemoglobins: structural bases for reactivity. PROGRESS IN BIOPHYSICS AND MOLECULAR BIOLOGY 1998; 68:29-68. [PMID: 9481144 DOI: 10.1016/s0079-6107(97)00017-5] [Citation(s) in RCA: 146] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- M Bolognesi
- Centro Biotecnologie Avanzate, IST, Università di Genova, Italy
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