1
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Benjamín-Rivera J, Otero MP, Tinoco AD. Reinforcing Protein Biochemistry: A Two-Week Experiment Studying Iron(III) Binding by the Transferrin Protein through Stoichiometric Determination, Stability Analysis, and Visualization of the Binding Site. JOURNAL OF CHEMICAL EDUCATION 2024; 101:1656-1664. [PMID: 38654892 PMCID: PMC11033862 DOI: 10.1021/acs.jchemed.3c01016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/04/2023] [Revised: 02/29/2024] [Accepted: 03/01/2024] [Indexed: 04/26/2024]
Abstract
The two-week protein biochemistry experience described herein focuses on reinforcing key biochemical concepts and achieving significant learning domain accomplishments for students (Content Knowledge, Logical Mathematical Reasoning, Visualization, Information Literacy, and Knowledge Integration) and valuable teaching opportunities for instructors. The experience encompasses an exploration of the transport protein serum transferrin as an important regulator of Fe(III) biochemistry and incorporates techniques to assess protein-metal stoichiometry and protein stability and to perform molecular visualization. Students gain practical experience in utilizing spectrophotometric analysis for constructing stoichiometric curves, in performing urea-PAGE, and in applying the PyMOL program to evaluate metal coordination at a protein binding site and the associated protein structural change. The learning and teaching accomplishments provide valuable skills that can be extended into research and translated to other teaching formats.
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Affiliation(s)
- Josué
A. Benjamín-Rivera
- Department
of Chemistry, University of Puerto Rico, Río Piedras Campus, Río Piedras, Puerto Rico 00931, United States
| | - Mariela Pérez Otero
- Department
of Biology, University of Puerto Rico, Río Piedras Campus, Río Piedras, Puerto Rico 00931, United States
| | - Arthur D. Tinoco
- Department
of Chemistry, University of Puerto Rico, Río Piedras Campus, Río Piedras, Puerto Rico 00931, United States
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2
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Khan S, Cho WC, Hussain A, Azimi S, Babadaei MMN, Bloukh SH, Edis Z, Saeed M, Ten Hagen TLM, Ahmadi H, Ale-Ebrahim M, Jaragh-Alhadad LA, Khan RH, Falahati M, Zhang X, Bai Q. The interaction mechanism of plasma iron transport protein transferrin with nanoparticles. Int J Biol Macromol 2023; 240:124441. [PMID: 37060978 DOI: 10.1016/j.ijbiomac.2023.124441] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2022] [Revised: 03/21/2023] [Accepted: 04/10/2023] [Indexed: 04/17/2023]
Abstract
In the biological systems, exposure to nanoparticles (NPs) can cause complicated interactions with proteins, the formation of protein corona and structural changes to proteins. These changes depend not only on NP physicochemical properties, but also on the intrinsic stability of protein molecules. Although, the formation of protein corona on the surface of NPs and the underlying mechanisms have been fully explored in various studies, no comprehensive review has discussed the direct biochemical and biophysical interactions between NPs and blood proteins, particularly transferrin. In this review, we first discussed the interaction of NPs with proteins to comprehend the effects of physicochemical properties of NPs on protein structure. We then overviewed the transferrin structure and its direct interaction with NPs to explore transferrin stability and its iron ion (Fe3+) release behavior. Afterwards, we surveyed the various biological functions of transferrin, such as Fe3+ binding, receptor binding, antibacterial activity, growth, differentiation, and coagulation, followed by the application of transferrin-modified NPs in the development of drug delivery systems for cancer therapy. We believe that this study can provide useful insight into the design and development of bioconjugates containing NP-transferrin for potential biomedical applications.
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Affiliation(s)
- Suliman Khan
- The Second Affiliated Hospital of Zhengzhou University, Zhengzhou, China; Department of Medical Lab Technology, The University of Haripur, Pakistan
| | - William C Cho
- Department of Clinical Oncology, Queen Elizabeth Hospital, Kowloon, Hong Kong
| | - Arif Hussain
- School of Life Sciences, Manipal Academy of Higher Education, Dubai, United Arab Emirates
| | - Sadaf Azimi
- Department of Biology, Science and Research Branch, Islamic Azad University, Tehran, Iran
| | - Mohammad Mahdi Nejadi Babadaei
- Department of Molecular Genetics, Faculty of Biological Science, North Tehran Branch, Islamic Azad University, Tehran, Iran
| | - Samir Haj Bloukh
- Department of Clinical Sciences, College of Pharmacy and Health Sciences, Ajman University, PO Box 346, Ajman, United Arab Emirates; Centre of Medical and Bio-allied Health Sciences Research, Ajman University, Ajman, United Arab Emirates
| | - Zehra Edis
- Centre of Medical and Bio-allied Health Sciences Research, Ajman University, Ajman, United Arab Emirates; Department of Pharmaceutical Sciences, College of Pharmacy and Health Sciences, Ajman University, PO Box 346, Ajman, United Arab Emirates
| | - Mesha Saeed
- Precision Medicine in Oncology (PrMiO), Department of Pathology, Erasmus MC Cancer Institute, Erasmus MC, Rotterdam, the Netherlands
| | - Timo L M Ten Hagen
- Precision Medicine in Oncology (PrMiO), Department of Pathology, Erasmus MC Cancer Institute, Erasmus MC, Rotterdam, the Netherlands; Nanomedicine Innovation Center Erasmus (NICE), Erasmus MC, Rotterdam, the Netherlands
| | - Hosein Ahmadi
- Department of Molecular Medicine, Institute of Medical Biotechnology, National Institute of Genetic Engineering and Biotechnology (NIGEB), Tehran, Iran
| | - Mahsa Ale-Ebrahim
- Department of Physiology, Faculty of Medicine, Tehran Medical Sciences, Islamic Azad University, Tehran, Iran
| | | | - Rizwan Hasan Khan
- Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh, UP 202002, India.
| | - Mojtaba Falahati
- Precision Medicine in Oncology (PrMiO), Department of Pathology, Erasmus MC Cancer Institute, Erasmus MC, Rotterdam, the Netherlands; Nanomedicine Innovation Center Erasmus (NICE), Erasmus MC, Rotterdam, the Netherlands.
| | - Xiaoju Zhang
- Department of Respiratory and Clinical Care Medicine, Henan Provisional People's Hospital, Zhengzhou, China.
| | - Qian Bai
- The Second Affiliated Hospital of Zhengzhou University, Zhengzhou, China.
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3
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Borko V, Friganović T, Weitner T. Glycoproteomics meets thermodynamics: A calorimetric study of the effect of sialylation and synergistic anion on the binding of iron to human serum transferrin. J Inorg Biochem 2023; 244:112207. [PMID: 37054508 DOI: 10.1016/j.jinorgbio.2023.112207] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2023] [Revised: 03/20/2023] [Accepted: 04/02/2023] [Indexed: 04/09/2023]
Abstract
The thermodynamic parameters for the binding of ferric ions to human serum transferrin (hTf) as the major mediator of iron transport in blood plasma were determined by isothermal titration calorimetry in the presence of carbonate and oxalate as synergistic anions at pH 7.4. The results indicate that the binding of ferric ions to the two binding sites of hTf is driven both enthalpically and entropically in a lobe-dependent manner: binding to the C-site is mainly enthalpically driven, whereas binding to the N-site is mainly entropically driven. Lower sialic acid content of hTf leads to more exothermic apparent binding enthalpies for both lobes, while the increased apparent binding constants for both sites were found in the presence of carbonate. Sialylation also unequally affected the heat change rates for both sites only in the presence of carbonate, but not in the presence of oxalate. Overall, the results suggest that the desialylated hTf has a higher iron sequestering ability, which may have implications for iron metabolism.
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4
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Kumar R, Sharma D, Kumar N, Kumari B, Kumar S, Kumar R. Substitution of carbonate by non-physiological synergistic anion modulates the stability and iron release kinetics of serum transferrin. BIOCHIMICA ET BIOPHYSICA ACTA. PROTEINS AND PROTEOMICS 2023; 1871:140856. [PMID: 36252939 DOI: 10.1016/j.bbapap.2022.140856] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/14/2022] [Revised: 09/26/2022] [Accepted: 10/04/2022] [Indexed: 11/06/2022]
Abstract
Serum transferrin (sTf) is a bi-lobal protein. Each lobe of sTf binds one Fe3+ ion in the presence of a synergistic anion. Physiologically, carbonate is the main synergistic anion but other anions such as oxalate, malonate, glycolate, maleate, glycine, etc. can substitute for carbonate in vitro. The present work provides the possible pathways by which the substitution of carbonate with oxalate affects the structural, kinetic, thermodynamic, and functional properties of blood plasma sTf. Analysis of equilibrium experiments measuring iron release and structural unfolding of carbonate and oxalate bound diferric-sTf (Fe2sTf) as a function of pH, urea concentration, and temperature reveal that the structural and iron-centers stability of Fe2sTf increase by substitution of carbonate with oxalate. Analysis of isothermal titration calorimetry (ITC) scans showed that the affinity of Fe3+ with apo-sTf is enhanced by substituting carbonate with oxalate. Analysis of kinetic and thermodynamic parameters measured for the iron release from the carbonate and oxalate bound monoferric-N-lobe of sTf (FeNsTf) and Fe2sTf at pH 7.4 and pH 5.6 reveals that the substitution of carbonate with oxalate inhibits/retards the iron release via increasing the enthalpic barriers.
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Affiliation(s)
- Rajesh Kumar
- School of Chemistry and Biochemistry, Thapar University, Patiala 147004, India
| | - Deepak Sharma
- Council of Scientific and Industrial Research-Institute of Microbial Technology, Sector 39A, Chandigarh, India
| | - Navinder Kumar
- Council of Scientific and Industrial Research-Institute of Microbial Technology, Sector 39A, Chandigarh, India
| | - Beeta Kumari
- Deparment of Chemistry, School of Basic Sciences, Central University of Punjab, Ghudda, Bathinda 151401, India
| | - Sanjeev Kumar
- Deparment of Chemistry, School of Basic Sciences, Central University of Punjab, Ghudda, Bathinda 151401, India
| | - Rajesh Kumar
- Deparment of Chemistry, School of Basic Sciences, Central University of Punjab, Ghudda, Bathinda 151401, India; School of Chemistry and Biochemistry, Thapar University, Patiala 147004, India.
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5
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Moreau T, Gautron J, Hincke MT, Monget P, Réhault-Godbert S, Guyot N. Antimicrobial Proteins and Peptides in Avian Eggshell: Structural Diversity and Potential Roles in Biomineralization. Front Immunol 2022; 13:946428. [PMID: 35967448 PMCID: PMC9363672 DOI: 10.3389/fimmu.2022.946428] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2022] [Accepted: 06/22/2022] [Indexed: 11/21/2022] Open
Abstract
The calcitic avian eggshell provides physical protection for the embryo during its development, but also regulates water and gaseous exchange, and is a calcium source for bone mineralization. The calcified eggshell has been extensively investigated in the chicken. It is characterized by an inventory of more than 900 matrix proteins. In addition to proteins involved in shell mineralization and regulation of its microstructure, the shell also contains numerous antimicrobial proteins and peptides (AMPPs) including lectin-like proteins, Bacterial Permeability Increasing/Lipopolysaccharide Binding Protein/PLUNC family proteins, defensins, antiproteases, and chelators, which contribute to the innate immune protection of the egg. In parallel, some of these proteins are thought to be crucial determinants of the eggshell texture and its resulting mechanical properties. During the progressive solubilization of the inner mineralized eggshell during embryonic development (to provide calcium to the embryo), some antimicrobials may be released simultaneously to reinforce egg defense and protect the egg from contamination by external pathogens, through a weakened eggshell. This review provides a comprehensive overview of the diversity of avian eggshell AMPPs, their three-dimensional structures and their mechanism of antimicrobial activity. The published chicken eggshell proteome databases are integrated for a comprehensive inventory of its AMPPs. Their biochemical features, potential dual function as antimicrobials and as regulators of eggshell biomineralization, and their phylogenetic evolution will be described and discussed with regard to their three-dimensional structural characteristics. Finally, the repertoire of chicken eggshell AMPPs are compared to orthologs identified in other avian and non-avian eggshells. This approach sheds light on the similarities and differences exhibited by AMPPs, depending on bird species, and leads to a better understanding of their sequential or dual role in biomineralization and innate immunity.
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Affiliation(s)
- Thierry Moreau
- INRAE, Université de Tours, BOA, Nouzilly, France
- *Correspondence: Nicolas Guyot, ; Thierry Moreau,
| | - Joël Gautron
- INRAE, Université de Tours, BOA, Nouzilly, France
| | - Maxwell T. Hincke
- Department of Innovation in Medical Education, Faculty of Medicine, University of Ottawa, Ottawa, ON, Canada
- Department of Cellular and Molecular Medicine, Faculty of Medicine, University of Ottawa, Ottawa, ON, Canada
| | - Philippe Monget
- INRAE, CNRS, IFCE, Université de Tours, PRC, Nouzilly, France
| | | | - Nicolas Guyot
- INRAE, Université de Tours, BOA, Nouzilly, France
- *Correspondence: Nicolas Guyot, ; Thierry Moreau,
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6
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Sherry D, Pandian R, Sayed Y. Non-active site mutations in the HIV protease: Diminished drug binding affinity is achieved through modulating the hydrophobic sliding mechanism. Int J Biol Macromol 2022; 217:27-41. [PMID: 35817239 DOI: 10.1016/j.ijbiomac.2022.07.033] [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: 04/12/2022] [Revised: 06/17/2022] [Accepted: 07/05/2022] [Indexed: 11/27/2022]
Abstract
The global HIV/AIDS epidemic still currently affects approximately 38 million individuals globally. The protease enzyme of the human immunodeficiency virus is a major drug target in antiviral therapy, however, under the influence of reverse transcriptase and in the context of drug pressure, the rapid PR mutation rate contributes significantly to clinical failure. The set of cooperative non-active site mutations, I13V/I62V/V77I, have been associated with reduced inhibitor susceptibility and are the focus of the current study. When compared to the wild-type protease the mutant protease exhibited decreased binding affinities towards ATV and DRV by 64- and 12-fold, respectively, and decreased the overall favourable Gibbs free energy for ATV, DRV, RTV and SQV. Moreover, these mutations decreased the thermal stability of the protease when in complex with ATV and DRV by approximately 6.4 and 4.2 °C, respectively. The crystal structure of the mutant protease revealed that the location of these mutations and their effect on the hydrophobic sliding mechanism may be crucial in their role in resistance.
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Affiliation(s)
- Dean Sherry
- Protein Structure-Function Research Unit, School of Molecular and Cell Biology, University of the Witwatersrand, Johannesburg 2050, South Africa
| | - Ramesh Pandian
- Protein Structure-Function Research Unit, School of Molecular and Cell Biology, University of the Witwatersrand, Johannesburg 2050, South Africa
| | - Yasien Sayed
- Protein Structure-Function Research Unit, School of Molecular and Cell Biology, University of the Witwatersrand, Johannesburg 2050, South Africa.
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7
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Telek E, Ujfalusi Z, Kemenesi G, Zana B, Jakab F, Hild G, Lukács A, Hild G. A Possible Way to Relate the Effects of SARS-CoV-2-Induced Changes in Transferrin to Severe COVID-19-Associated Diseases. Int J Mol Sci 2022; 23:ijms23116189. [PMID: 35682873 PMCID: PMC9181396 DOI: 10.3390/ijms23116189] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2022] [Revised: 05/25/2022] [Accepted: 05/30/2022] [Indexed: 02/04/2023] Open
Abstract
SARS-CoV-2 infections are responsible for the COVID-19 pandemic. Transferrin has been found to explain the link between diseases associated with impaired iron transport and COVID-19 infection. The effect of SARS-CoV-2 on human whole blood was studied by differential scanning calorimetry. The analysis of the thermal transition curves showed that the melting temperature of the transferrin-related peak decreased in the presence of SARS-CoV-2. The ratio of the under-curve area of the two main peaks was greatly affected, while the total enthalpy of the heat denaturation remained nearly unchanged in the presence of the virus. These results indicate that SARS-CoV-2, through binding to transferrin, may influence its Fe3+ uptake by inducing thermodynamic changes. Therefore, transferrin may remain in an iron-free apo-conformational state, which depends on the SARS-CoV-2 concentration. SARS-CoV-2 can induce disturbance in erythropoiesis due to toxicity generated by free iron overload.
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Affiliation(s)
- Elek Telek
- Department of Biophysics, Medical School, University of Pécs, Szigeti Str. 12, H-7624 Pécs, Hungary; (E.T.); (Z.U.); (A.L.)
| | - Zoltán Ujfalusi
- Department of Biophysics, Medical School, University of Pécs, Szigeti Str. 12, H-7624 Pécs, Hungary; (E.T.); (Z.U.); (A.L.)
| | - Gábor Kemenesi
- Szentágothai Research Centre, Virological Research Group, University of Pécs, Ifjúság Str. 20, H-7624 Pécs, Hungary; (G.K.); (B.Z.); (F.J.)
- Faculty of Sciences, Institute of Biology, University of Pécs, Ifjúság Str. 6, H-7624 Pécs, Hungary
- National Laboratory of Virology, University of Pécs, Ifjúság Str. 20, H-7624 Pécs, Hungary
| | - Brigitta Zana
- Szentágothai Research Centre, Virological Research Group, University of Pécs, Ifjúság Str. 20, H-7624 Pécs, Hungary; (G.K.); (B.Z.); (F.J.)
- Faculty of Sciences, Institute of Biology, University of Pécs, Ifjúság Str. 6, H-7624 Pécs, Hungary
- National Laboratory of Virology, University of Pécs, Ifjúság Str. 20, H-7624 Pécs, Hungary
| | - Ferenc Jakab
- Szentágothai Research Centre, Virological Research Group, University of Pécs, Ifjúság Str. 20, H-7624 Pécs, Hungary; (G.K.); (B.Z.); (F.J.)
- Faculty of Sciences, Institute of Biology, University of Pécs, Ifjúság Str. 6, H-7624 Pécs, Hungary
- National Laboratory of Virology, University of Pécs, Ifjúság Str. 20, H-7624 Pécs, Hungary
| | - Gabriella Hild
- Languages for Biomedical Purposes and Communication, Medical School, University of Pécs, Szigeti Str. 12, H-7624 Pécs, Hungary;
| | - András Lukács
- Department of Biophysics, Medical School, University of Pécs, Szigeti Str. 12, H-7624 Pécs, Hungary; (E.T.); (Z.U.); (A.L.)
| | - Gábor Hild
- Department of Biophysics, Medical School, University of Pécs, Szigeti Str. 12, H-7624 Pécs, Hungary; (E.T.); (Z.U.); (A.L.)
- Department of Medical Imaging, Clinical Centre, University of Pécs, Ifjúság Str. 13, H-7624 Pécs, Hungary
- Correspondence:
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8
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Guillén S, Cebrián G. Relationship between iron bioavailability and Salmonella Typhimurium fitness in raw and pasteurized liquid whole egg. Food Microbiol 2022; 104:104008. [DOI: 10.1016/j.fm.2022.104008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2021] [Revised: 02/16/2022] [Accepted: 02/21/2022] [Indexed: 11/27/2022]
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9
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Jiménez-Barrios P, Jaén-Cano CM, Malumbres R, Cilveti-Vidaurreta F, Bellanco-Sevilla A, Miralles B, Recio I, Martínez-Sanz M. Thermal stability of bovine lactoferrin prepared by cation exchange chromatography and its blends with authorized additives for infant formulas. Lebensm Wiss Technol 2022. [DOI: 10.1016/j.lwt.2021.112744] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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10
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Silva AM, Moniz T, de Castro B, Rangel M. Human transferrin: An inorganic biochemistry perspective. Coord Chem Rev 2021. [DOI: 10.1016/j.ccr.2021.214186] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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11
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Rathnapala ECN, Ahn DU, Abeyrathne EDNS. Enzymatic Hydrolysis of Ovotransferrin and the Functional Properties of Its Hydrolysates. Food Sci Anim Resour 2021; 41:608-622. [PMID: 34291210 PMCID: PMC8277180 DOI: 10.5851/kosfa.2021.e19] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2020] [Revised: 02/15/2021] [Accepted: 04/04/2021] [Indexed: 11/17/2022] Open
Abstract
Bioactive peptides have great potentials as nutraceutical and pharmaceutical
agents that can improve human health. The objectives of this research were to
produce functional peptides from ovotransferrin, a major egg white protein,
using single enzyme treatments, and to analyze the properties of the
hydrolysates produced. Lyophilized ovotransferrin was dissolved in distilled
water at 20 mg/mL, treated with protease, elastase, papain, trypsin, or
α-chymotrypsin at 1% (w/v) level of substrate, and incubated for
0–24 h at the optimal temperature of each enzyme (protease 55°C,
papain 37°C, elastase 25°C, trypsin 37°C,
α-chymotrypsin 37°C). The hydrolysates were tested for
antioxidant, metal-chelating, and antimicrobial activities. Protease, papain,
trypsin, and α-chymotrypsin hydrolyzed ovotransferrin relatively well
after 3 h of incubation, but it took 24 h with elastase to reach a similar
degree of hydrolysis. The hydrolysates obtained after 3 h of incubation with
protease, papain, trypsin, α-chymotrypsin, and after 24 h with elastase
were selected as the best products to analyze their functional properties. None
of the hydrolysates exhibited antioxidant properties in the oil emulsion nor
antimicrobial property at 20 mg/mL concentration. However, ovotransferrin with
α-chymotrypsin and with elastase had higher
Fe3+-chelating activities (1.06±0.88%,
1.25±0.24%) than the native ovotransferrin
(0.46±0.60%). Overall, the results indicated that the
single-enzyme treatments of ovotransferrin were not effective to produce
peptides with antioxidant, antimicrobial, or Fe3+-chelating
activity. Further research on the effects of enzyme combinations may be
needed.
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Affiliation(s)
| | - Dong Uk Ahn
- Department of Animal Science, Iowa State University, Ames IA 50011, USA
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12
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Singh CSB, Eyford BA, Abraham T, Munro L, Choi KB, Okon M, Vitalis TZ, Gabathuler R, Lu CJ, Pfeifer CG, Tian MM, Jefferies WA. Discovery of a Highly Conserved Peptide in the Iron Transporter Melanotransferrin that Traverses an Intact Blood Brain Barrier and Localizes in Neural Cells. Front Neurosci 2021; 15:596976. [PMID: 34149342 PMCID: PMC8212695 DOI: 10.3389/fnins.2021.596976] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2020] [Accepted: 04/01/2021] [Indexed: 11/13/2022] Open
Abstract
The blood-brain barrier (BBB) hinders the distribution of therapeutics intended for treatment of diseases of the brain. Our previous studies demonstrated that that a soluble form of melanotransferrin (MTf; Uniprot P08582; also known as p97, MFI2, and CD228), a mammalian iron-transport protein, is an effective carrier for delivery of drug conjugates across the BBB into the brain and was the first BBB targeting delivery system to demonstrate therapeutic efficacy within the brain. Here, we performed a screen to identify peptides from MTf capable of traversing the BBB. We identified a highly conserved 12-amino acid peptide, termed MTfp, that retains the ability to cross the intact BBB intact, distributes throughout the parenchyma, and enter endosomes and lysosomes within neurons, astrocytes and microglia in the brain. This peptide may provide a platform for the transport of therapeutics to the CNS, and thereby offers new avenues for potential treatments of neuropathologies that are currently refractory to existing therapies.
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Affiliation(s)
- Chaahat S B Singh
- Michael Smith Laboratories, University of British Columbia, Vancouver, BC, Canada.,The Vancouver Prostate Centre, Vancouver General Hospital, Vancouver, BC, Canada.,Centre for Blood Research, University of British Columbia, Vancouver, BC, Canada.,The Djavad Mowafaghian Centre for Brain Health, University of British Columbia, Vancouver, BC, Canada.,Department of Medical Genetics, University of British Columbia, Vancouver, BC, Canada
| | - Brett A Eyford
- Michael Smith Laboratories, University of British Columbia, Vancouver, BC, Canada.,The Vancouver Prostate Centre, Vancouver General Hospital, Vancouver, BC, Canada.,Centre for Blood Research, University of British Columbia, Vancouver, BC, Canada.,The Djavad Mowafaghian Centre for Brain Health, University of British Columbia, Vancouver, BC, Canada
| | - Thomas Abraham
- Department of Neural and Behavioral Sciences and Microscopy Imaging Core Lab, Pennsylvania State College of Medicine, Hershey, PA, United States
| | - Lonna Munro
- Michael Smith Laboratories, University of British Columbia, Vancouver, BC, Canada.,The Vancouver Prostate Centre, Vancouver General Hospital, Vancouver, BC, Canada.,Centre for Blood Research, University of British Columbia, Vancouver, BC, Canada.,The Djavad Mowafaghian Centre for Brain Health, University of British Columbia, Vancouver, BC, Canada
| | - Kyung Bok Choi
- Michael Smith Laboratories, University of British Columbia, Vancouver, BC, Canada.,The Vancouver Prostate Centre, Vancouver General Hospital, Vancouver, BC, Canada.,Centre for Blood Research, University of British Columbia, Vancouver, BC, Canada.,The Djavad Mowafaghian Centre for Brain Health, University of British Columbia, Vancouver, BC, Canada
| | - Mark Okon
- Department of Chemistry, University of British Columbia, Vancouver, BC, Canada
| | | | - Reinhard Gabathuler
- Bioasis Technologies Inc., Guilford, CT, United States.,King's College London, London, United Kingdom
| | - Chieh-Ju Lu
- Michael Smith Laboratories, University of British Columbia, Vancouver, BC, Canada.,The Vancouver Prostate Centre, Vancouver General Hospital, Vancouver, BC, Canada.,Centre for Blood Research, University of British Columbia, Vancouver, BC, Canada.,The Djavad Mowafaghian Centre for Brain Health, University of British Columbia, Vancouver, BC, Canada
| | - Cheryl G Pfeifer
- Michael Smith Laboratories, University of British Columbia, Vancouver, BC, Canada.,The Vancouver Prostate Centre, Vancouver General Hospital, Vancouver, BC, Canada.,Centre for Blood Research, University of British Columbia, Vancouver, BC, Canada.,The Djavad Mowafaghian Centre for Brain Health, University of British Columbia, Vancouver, BC, Canada
| | - Mei Mei Tian
- Bioasis Technologies Inc., Guilford, CT, United States
| | - Wilfred A Jefferies
- Michael Smith Laboratories, University of British Columbia, Vancouver, BC, Canada.,The Vancouver Prostate Centre, Vancouver General Hospital, Vancouver, BC, Canada.,Centre for Blood Research, University of British Columbia, Vancouver, BC, Canada.,The Djavad Mowafaghian Centre for Brain Health, University of British Columbia, Vancouver, BC, Canada.,Department of Medical Genetics, University of British Columbia, Vancouver, BC, Canada.,Department of Urologic Sciences, University of British Columbia, Vancouver, BC, Canada.,Department of Microbiology and Immunology, University of British Columbia, Vancouver, BC, Canada.,Department of Zoology, University of British Columbia, Vancouver, BC, Canada
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13
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Legros J, Jan S, Bonnassie S, Gautier M, Croguennec T, Pezennec S, Cochet MF, Nau F, Andrews SC, Baron F. The Role of Ovotransferrin in Egg-White Antimicrobial Activity: A Review. Foods 2021; 10:823. [PMID: 33920211 PMCID: PMC8070150 DOI: 10.3390/foods10040823] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2021] [Revised: 04/07/2021] [Accepted: 04/08/2021] [Indexed: 12/17/2022] Open
Abstract
Eggs are a whole food which affordably support human nutritional requirements worldwide. Eggs strongly resist bacterial infection due to an arsenal of defensive systems, many of which reside in the egg white. However, despite improved control of egg production and distribution, eggs remain a vehicle for foodborne transmission of Salmonella enterica serovar Enteritidis, which continues to represent a major public health challenge. It is generally accepted that iron deficiency, mediated by the iron-chelating properties of the egg-white protein ovotransferrin, has a key role in inhibiting infection of eggs by Salmonella. Ovotransferrin has an additional antibacterial activity beyond iron-chelation, which appears to depend on direct interaction with the bacterial cell surface, resulting in membrane perturbation. Current understanding of the antibacterial role of ovotransferrin is limited by a failure to fully consider its activity within the natural context of the egg white, where a series relevant environmental factors (such as alkalinity, high viscosity, ionic composition, and egg white protein interactions) may exert significant influence on ovotransferrin activity. This review provides an overview of what is known and what remains to be determined regarding the antimicrobial activity of ovotransferrin in egg white, and thus enhances understanding of egg safety through improved insight of this key antimicrobial component of eggs.
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Affiliation(s)
- Julie Legros
- STLO, INRAE, Institut Agro, 35042 Rennes, France; (J.L.); (S.J.); (M.G.); (T.C.); (S.P.); (M.-F.C.); (F.N.)
- School of Biological Sciences, Health and Life Sciences Building, University of Reading, Reading RG6 6AX, UK;
| | - Sophie Jan
- STLO, INRAE, Institut Agro, 35042 Rennes, France; (J.L.); (S.J.); (M.G.); (T.C.); (S.P.); (M.-F.C.); (F.N.)
| | - Sylvie Bonnassie
- UFR Sciences de la vie et de L’environnement, Université de Rennes 1, 35000 Rennes, France;
| | - Michel Gautier
- STLO, INRAE, Institut Agro, 35042 Rennes, France; (J.L.); (S.J.); (M.G.); (T.C.); (S.P.); (M.-F.C.); (F.N.)
| | - Thomas Croguennec
- STLO, INRAE, Institut Agro, 35042 Rennes, France; (J.L.); (S.J.); (M.G.); (T.C.); (S.P.); (M.-F.C.); (F.N.)
| | - Stéphane Pezennec
- STLO, INRAE, Institut Agro, 35042 Rennes, France; (J.L.); (S.J.); (M.G.); (T.C.); (S.P.); (M.-F.C.); (F.N.)
| | - Marie-Françoise Cochet
- STLO, INRAE, Institut Agro, 35042 Rennes, France; (J.L.); (S.J.); (M.G.); (T.C.); (S.P.); (M.-F.C.); (F.N.)
| | - Françoise Nau
- STLO, INRAE, Institut Agro, 35042 Rennes, France; (J.L.); (S.J.); (M.G.); (T.C.); (S.P.); (M.-F.C.); (F.N.)
| | - Simon C. Andrews
- School of Biological Sciences, Health and Life Sciences Building, University of Reading, Reading RG6 6AX, UK;
| | - Florence Baron
- STLO, INRAE, Institut Agro, 35042 Rennes, France; (J.L.); (S.J.); (M.G.); (T.C.); (S.P.); (M.-F.C.); (F.N.)
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Rathnapala ECN, Ahn DU, Abeyrathne S. Functional properties of ovotransferrin from chicken egg white and its derived peptides: a review. Food Sci Biotechnol 2021; 30:619-630. [PMID: 33814941 PMCID: PMC8006106 DOI: 10.1007/s10068-021-00901-3] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2020] [Revised: 02/25/2021] [Accepted: 03/04/2021] [Indexed: 01/17/2023] Open
Abstract
With emerging trends in the food and pharmaceutical industries, potential applications of egg-derived bioactive compounds were recognized. Ovotransferrin is a major egg white functional protein responsible for multiple bioactivities. The objectives of this review are to provide scientific evidence of the functional properties of chicken ovotransferrin and its derived peptides and to identify future research approaches and applications. Various easy, economical, and non-toxic methods have been reported to produce ovotransferrin with high yield and purity, and chemical and enzymatic approaches have been employed to release bioactive peptides. The native ovotransferrin is known to have antimicrobial, antioxidant, anticancer, and immunomodulatory activities. The peptides produced from ovotransferrin also are reported to have antioxidant, antimicrobial, antihypertensive, and anticancer properties. However, little or no application of these compounds in the food and pharmaceutical areas is available yet. Therefore, the practical application of OTF in nutraceutical and pharmaceutical areas are among the emerging areas of research.
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Benjamín-Rivera JA, Cardona-Rivera AE, Vázquez-Maldonado ÁL, Dones-Lassalle CY, Pabón-Colon HL, Rodríguez-Rivera HM, Rodríguez I, González-Espiet JC, Pazol J, Pérez-Ríos JD, Catala-Torres JF, Carrasquillo Rivera M, De Jesus-Soto MG, Cordero-Virella NA, Cruz-Maldonado PM, González-Pagan P, Hernández-Ríos R, Gaur K, Loza-Rosas SA, Tinoco AD. Exploring Serum Transferrin Regulation of Nonferric Metal Therapeutic Function and Toxicity. INORGANICS 2020; 8:48. [PMID: 36844373 PMCID: PMC9957567 DOI: 10.3390/inorganics8090048] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Serum transferrin (sTf) plays a pivotal role in regulating iron biodistribution and homeostasis within the body. The molecular details of sTf Fe(III) binding blood transport, and cellular delivery through transferrin receptor-mediated endocytosis are generally well-understood. Emerging interest exists in exploring sTf complexation of nonferric metals as it facilitates the therapeutic potential and toxicity of several of them. This review explores recent X-ray structural and physiologically relevant metal speciation studies to understand how sTf partakes in the bioactivity of key non-redox active hard Lewis acidic metals. It challenges preconceived notions of sTf structure function correlations that were based exclusively on the Fe(III) model by revealing distinct coordination modalities that nonferric metal ions can adopt and different modes of binding to metal-free and Fe(III)-bound sTf that can directly influence how they enter into cells and, ultimately, how they may impact human health. This knowledge informs on biomedical strategies to engineer sTf as a delivery vehicle for metal-based diagnostic and therapeutic agents in the cancer field. It is the intention of this work to open new avenues for characterizing the functionality and medical utility of nonferric-bound sTf and to expand the significance of this protein in the context of bioinorganic chemistry.
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Affiliation(s)
- Josué A. Benjamín-Rivera
- Department of Chemistry, University of Puerto Rico, Río Piedras Campus, Río Piedras, PR 00931, USA)
| | - Andrés E. Cardona-Rivera
- Department of Chemistry, University of Puerto Rico, Río Piedras Campus, Río Piedras, PR 00931, USA)
| | | | | | - Héctor L. Pabón-Colon
- Department of Chemistry, University of Puerto Rico, Río Piedras Campus, Río Piedras, PR 00931, USA)
| | | | - Israel Rodríguez
- Department of Chemistry, University of Puerto Rico, Río Piedras Campus, Río Piedras, PR 00931, USA)
| | - Jean C. González-Espiet
- Department of Chemistry, University of Puerto Rico, Río Piedras Campus, Río Piedras, PR 00931, USA)
| | - Jessika Pazol
- Department of Chemistry, University of Puerto Rico, Río Piedras Campus, Río Piedras, PR 00931, USA)
| | - Jobaniel D. Pérez-Ríos
- Department of Chemistry, University of Puerto Rico, Río Piedras Campus, Río Piedras, PR 00931, USA)
| | - José F. Catala-Torres
- Department of Chemistry, University of Puerto Rico, Río Piedras Campus, Río Piedras, PR 00931, USA)
| | | | - Michael G. De Jesus-Soto
- Department of Chemistry, University of Puerto Rico, Río Piedras Campus, Río Piedras, PR 00931, USA)
| | | | - Paola M. Cruz-Maldonado
- Department of Chemistry, University of Puerto Rico, Río Piedras Campus, Río Piedras, PR 00931, USA)
| | - Patricia González-Pagan
- Department of Chemistry, University of Puerto Rico, Río Piedras Campus, Río Piedras, PR 00931, USA)
| | - Raul Hernández-Ríos
- Department of Chemistry, University of Puerto Rico, Río Piedras Campus, Río Piedras, PR 00931, USA)
| | - Kavita Gaur
- Department of Chemistry, University of Puerto Rico, Río Piedras Campus, Río Piedras, PR 00931, USA)
| | - Sergio A. Loza-Rosas
- Departamento de Química y Bioquímica, Facultad de Ciencias e Ingeniería, Universidad de Boyacá, Tunja 150003, Colombia
| | - Arthur D. Tinoco
- Department of Chemistry, University of Puerto Rico, Río Piedras Campus, Río Piedras, PR 00931, USA)
- Correspondence: ; Tel.: +1-939-319-9701
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Martens U, Böttcher D, Talbot D, Bornscheuer U, Abou-Hassan A, Delcea M. Maghemite nanoparticles stabilize the protein corona formed with transferrin presenting different iron-saturation levels. NANOSCALE 2019; 11:16063-16070. [PMID: 31432845 DOI: 10.1039/c9nr04967c] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Magnetic nanoparticles are ideal candidates for biomedical applications given their potential use in magnetic resonance imaging, magnetic hyperthermia and targeted drug delivery. Understanding protein-nanoparticle interactions in the blood stream is of major importance due to their potential risks, especially immunogenicity (i.e. the ability to induce an immune response). Here, we report on the interaction of superparamagnetic maghemite (γ-Fe2O3) nanoparticles with human blood plasma protein transferrin presenting different iron-saturation levels: partially iron-saturated (i.e. transferrin) and iron-free transferrin (i.e. apotransferrin). The nanoparticle-protein interaction and the protein corona formation were studied using biophysical and chemical approaches based on dynamic light scattering, gel electrophoresis, circular dichroism spectroscopy and differential scanning fluorimetry. We found that iron content governs the protein corona formation and induces a strong effect on the thermal stability of the bound protein. Our results demonstrate a stabilizing effect of the nanoparticles with a change of the unfolding position of approximately 10 °C towards higher temperatures for transferrin. Our study may be relevant for the further development of magnetic nanoparticles as diagnostic and therapeutic tools.
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Affiliation(s)
- Ulrike Martens
- Institute of Biochemistry, University of Greifswald, Felix-Hausdorff-Str. 4, 17489 Greifswald, Germany. and ZIK HIKE - Center for Innovation Competence "Humoral Immune Reactions in Cardiovascular Diseases", University of Greifswald, Fleischmannstr. 42-44, 17489 Greifswald, Germany
| | - Dominique Böttcher
- Institute of Biochemistry, University of Greifswald, Felix-Hausdorff-Str. 4, 17489 Greifswald, Germany.
| | - Delphine Talbot
- Sorbonne Université, CNRS, Physico-chimie des Electrolytes et Nanosystèmes InterfaciauX, F-75005 Paris, France
| | - Uwe Bornscheuer
- Institute of Biochemistry, University of Greifswald, Felix-Hausdorff-Str. 4, 17489 Greifswald, Germany.
| | - Ali Abou-Hassan
- Sorbonne Université, CNRS, Physico-chimie des Electrolytes et Nanosystèmes InterfaciauX, F-75005 Paris, France
| | - Mihaela Delcea
- Institute of Biochemistry, University of Greifswald, Felix-Hausdorff-Str. 4, 17489 Greifswald, Germany. and ZIK HIKE - Center for Innovation Competence "Humoral Immune Reactions in Cardiovascular Diseases", University of Greifswald, Fleischmannstr. 42-44, 17489 Greifswald, Germany
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17
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The anti-bacterial iron-restriction defence mechanisms of egg white; the potential role of three lipocalin-like proteins in resistance against Salmonella. Biometals 2019; 32:453-467. [PMID: 30810876 PMCID: PMC6584246 DOI: 10.1007/s10534-019-00180-w] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2019] [Accepted: 01/25/2019] [Indexed: 11/26/2022]
Abstract
Salmonella enterica serovar Enteritidis (SE) is the most frequently-detected Salmonella in foodborne outbreaks in the European Union. Among such outbreaks, egg and egg products were identified as the most common vehicles of infection. Possibly, the major antibacterial property of egg white is iron restriction, which results from the presence of the iron-binding protein, ovotransferrin. To circumvent iron restriction, SE synthesise catecholate siderophores (i.e. enterobactin and salmochelin) that can chelate iron from host iron-binding proteins. Here, we highlight the role of lipocalin-like proteins found in egg white that could enhance egg-white iron restriction through sequestration of certain siderophores, including enterobactin. Indeed, it is now apparent that the egg-white lipocalin, Ex-FABP, can inhibit bacterial growth via its siderophore-binding capacity in vitro. However, it remains unclear whether Ex-FABP performs such a function in egg white or during bird infection. Regarding the two other lipocalins of egg white (Cal-γ and α-1-glycoprotein), there is currently no evidence to indicate that they sequester siderophores.
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18
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Saxena M, Loza-Rosas SA, Gaur K, Sharma S, Pérez Otero SC, Tinoco AD. Exploring titanium(IV) chemical proximity to iron(III) to elucidate a function for Ti(IV) in the human body. Coord Chem Rev 2018; 363:109-125. [PMID: 30270932 PMCID: PMC6159949 DOI: 10.1016/j.ccr.2018.03.006] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Despite its natural abundance and widespread use as food, paint additive, and in bone implants, no specific biological function of titanium is known in the human body. High concentrations of Ti(IV) could result in cellular toxicity, however, the absence of Ti toxicity in the blood of patients with titanium bone implants indicates the presence of one or more biological mechanisms to mitigate toxicity. Similar to Fe(III), Ti(IV) in blood binds to the iron transport protein serum transferrin (sTf), which gives credence to the possibility of its cellular uptake mechanism by transferrin-directed endocytosis. However, once inside the cell, how sTf bound Ti(IV) is released into the cytoplasm, utilized, or stored remain largely unknown. To explain the molecular mechanisms involved in Ti use in cells we have drawn parallels with those for Fe(III). Based on its chemical similarities with Fe(III), we compare the biological coordination chemistry of Fe(III) and Ti(IV) and hypothesize that Ti(IV) can bind to similar intracellular biomolecules. The comparable ligand affinity profiles suggest that at high Ti(IV) concentrations, Ti(IV) could compete with Fe(III) to bind to biomolecules and would inhibit Fe bioavailability. At the typical Ti concentrations in the body, Ti might exist as a labile pool of Ti(IV) in cells, similar to Fe. Ti could exhibit different types of properties that would determine its cellular functions. We predict some of these functions to mimic those of Fe in the cell and others to be specific to Ti. Bone and cellular speciation and localization studies hint toward various intracellular targets of Ti like phosphoproteins, DNA, ribonucleotide reductase, and ferritin. However, to decipher the exact mechanisms of how Ti might mediate these roles, development of innovative and more sensitive methods are required to track this difficult to trace metal in vivo.
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Affiliation(s)
- Manoj Saxena
- Department of Chemistry, University of Puerto Rico Río Piedras, San Juan, PR 00931
| | - Sergio A. Loza-Rosas
- Department of Chemistry, University of Puerto Rico Río Piedras, San Juan, PR 00931
| | - Kavita Gaur
- Department of Chemistry, University of Puerto Rico Río Piedras, San Juan, PR 00931
| | - Shweta Sharma
- Department of Environmental Sciences, University of Puerto Rico Río Piedras, San Juan, PR 00931
| | - Sofia C. Pérez Otero
- Department of Chemistry, University of Puerto Rico Río Piedras, San Juan, PR 00931
| | - Arthur D. Tinoco
- Department of Chemistry, University of Puerto Rico Río Piedras, San Juan, PR 00931
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Tadrowski S, Pedroso MM, Sieber V, Larrabee JA, Guddat LW, Schenk G. Metal Ions Play an Essential Catalytic Role in the Mechanism of Ketol-Acid Reductoisomerase. Chemistry 2016; 22:7427-36. [PMID: 27136273 DOI: 10.1002/chem.201600620] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2016] [Indexed: 01/13/2023]
Abstract
Ketol-acid reductoisomerase (KARI) is a Mg(2+) -dependent enzyme in the branched-chain amino acid biosynthesis pathway. It catalyses a complex two-part reaction: an alkyl migration followed by a NADPH-dependent reduction. Both reactions occur within the one active site, but in particular, the mechanism of the isomerisation step is poorly understood. Here, using a combination of kinetic, thermodynamic and spectroscopic techniques, the reaction mechanisms of both Escherichia coli and rice KARI have been investigated. We propose a conserved mechanism of catalysis, whereby a hydroxide, bridging the two Mg(2+) ions in the active site, initiates the reaction by abstracting a proton from the C2 alcohol group of the substrate. While the μ-hydroxide-bridged dimetallic centre is pre-assembled in the bacterial enzyme, in plant KARI substrate binding leads to a reduction of the metal-metal distance with the concomitant formation of a hydroxide bridge. Only Mg(2+) is capable of promoting the isomerisation reaction, likely to be due to non-competent substrate binding in the presence of other metal ions.
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Affiliation(s)
- Sonya Tadrowski
- School of Chemistry and Molecular Biosciences, The University of Queensland, St. Lucia, QLD 4072, Australia
| | - Marcelo M Pedroso
- School of Chemistry and Molecular Biosciences, The University of Queensland, St. Lucia, QLD 4072, Australia
| | - Volker Sieber
- Straubing Center of Science, Technische Universität München, Straubing, Germany
| | - James A Larrabee
- Department of Chemistry and Biochemistry, Middlebury College, Middlebury, VT, 05753, USA
| | - Luke W Guddat
- School of Chemistry and Molecular Biosciences, The University of Queensland, St. Lucia, QLD 4072, Australia.
| | - Gerhard Schenk
- School of Chemistry and Molecular Biosciences, The University of Queensland, St. Lucia, QLD 4072, Australia.
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20
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Tinoco AD, Saxena M, Sharma S, Noinaj N, Delgado Y, Quiñones González EP, Conklin SE, Zambrana N, Loza-Rosas SA, Parks TB. Unusual Synergism of Transferrin and Citrate in the Regulation of Ti(IV) Speciation, Transport, and Toxicity. J Am Chem Soc 2016; 138:5659-65. [PMID: 27070073 DOI: 10.1021/jacs.6b01966] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Human serum transferrin (sTf) is a protein that mediates the transport of iron from blood to cells. Assisted by the synergistic anion carbonate, sTf transports Fe(III) by binding the metal ion in a closed conformation. Previous studies suggest sTf's role as a potential transporter of other metals such as titanium. Ti is a widely used metal in colorants, foods, and implants. A substantial amount of Ti is leached into blood from these implants. However, the fate of the leached Ti and its transport into the cells is not known. Understanding Ti interaction with sTf assumes a greater significance with our ever increasing exposure to Ti in the form of implants. On the basis of in vitro studies, it was speculated that transferrin can bind Ti(IV) assisted by a synergistic anion. However, the role and identity of the synergistic anion(s) and the conformational state in which sTf binds Ti(IV) are not known. Here we have solved the first X-ray crystal structure of a Ti(IV)-bound sTf. We find that sTf binds Ti(IV) in an open conformation with both carbonate and citrate as synergistic anions at the metal binding sites, an unprecedented role for citrate. Studies with cell lines suggest that Ti(IV)-sTf is transported into cells and that sTf and citrate regulate the metal's blood speciation and attenuate its cytotoxic property. Our results provide the first glimpse into the citrate-transferrin synergism in the regulation of Ti(IV) bioactivity and offers insight into the future design of Ti(IV)-based anticancer drugs.
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Affiliation(s)
| | | | | | - Nicholas Noinaj
- Department of Biological Sciences, Purdue University , 240 S. Martin Jischke Drive, Hockmeyer Hall, West Lafayette, Indiana 47907, United States
| | | | | | | | | | | | - Timothy B Parks
- VA Caribbean Healthcare System, 10 Casia Street, San Juan, Puerto Rico 00921
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Moderate conformational impact of citrate on ovotransferrin considerably increases its capacity to self-assemble at the interface. J Colloid Interface Sci 2015; 437:219-226. [DOI: 10.1016/j.jcis.2014.09.035] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2014] [Revised: 09/12/2014] [Accepted: 09/15/2014] [Indexed: 11/30/2022]
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22
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Varon O, Allen KJ, Bennett DC, Mesak LR, Scaman CH. Purification and characterization of tinamou egg white ovotransferrin as an antimicrobial agent against foodborne pathogenic bacteria. Food Res Int 2013. [DOI: 10.1016/j.foodres.2013.02.041] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Kumar R, Mauk AG. Protonation and Anion Binding Control the Kinetics of Iron Release from Human Transferrin. J Phys Chem B 2012; 116:3795-807. [DOI: 10.1021/jp205879h] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Rajesh Kumar
- Department of Biochemistry
and Molecular Biology and the Centre for
Blood Research, Life Sciences Centre, 2350 Health Sciences
Mall, University of British Columbia, Vancouver,
BC V6T 1Z3 Canada
- School of Chemistry
and Biochemistry, Thapar University, Patiala 147004, India
| | - A. Grant Mauk
- Department of Biochemistry
and Molecular Biology and the Centre for
Blood Research, Life Sciences Centre, 2350 Health Sciences
Mall, University of British Columbia, Vancouver,
BC V6T 1Z3 Canada
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25
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Physiological roles of ovotransferrin. Biochim Biophys Acta Gen Subj 2011; 1820:218-25. [PMID: 21854833 DOI: 10.1016/j.bbagen.2011.08.004] [Citation(s) in RCA: 81] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2011] [Revised: 07/29/2011] [Accepted: 08/04/2011] [Indexed: 01/24/2023]
Abstract
BACKGROUND Ovotransferrin is an iron-binding glycoprotein, found in avian egg white and in avian serum, belonging to the family of transferrin iron-binding glycoproteins. All transferrins show high sequence homology. In mammals are presents two different soluble glycoproteins with different functions: i) serum transferrin that is present in plasma and committed to iron transport and iron delivery to cells and ii) lactoferrin that is present in extracellular fluids and in specific granules of polymorphonuclear lymphocytes and committed to the so-called natural immunity. To the contrary, in birds, ovotransferrin remained the only soluble glycoprotein of the transferrin family present both in plasma and egg white. SCOPE OF REVIEW Substantial experimental evidences are summarized, illustrating the multiple physiological roles of ovotransferrin in an attempt to overcome the common belief that ovotransferrin is a protein dedicated only to iron transport and to iron withholding antibacterial activity. MAJOR CONCLUSIONS Similarly to the better known family member protein lactoferrin, ovotransferrin appears to be a multi-functional protein with a major role in avian natural immunity. GENERAL SIGNIFICANCE Biotechnological applications of ovotransferrin and ovotransferrin-related peptides could be considered in the near future, stimulating further research on this remarkable protein. This article is part of a Special Issue entitled Transferrins: Molecular mechanisms of iron transport and disorders.
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26
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Bengoechea C, Peinado I, McClements DJ. Formation of protein nanoparticles by controlled heat treatment of lactoferrin: Factors affecting particle characteristics. Food Hydrocoll 2011. [DOI: 10.1016/j.foodhyd.2010.12.014] [Citation(s) in RCA: 72] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Abstract
Following isolation and purification, it is often necessary to store proteins and peptides for extended periods of time before performing detailed biophysical, enzymatic, and structural proteomics. Therefore, it is essential that the pure target protein maintain its original biological (or functional) behavior over an extended period of storage which may range from weeks to years. Protein pharmaceuticals must remain viable following extensive shipping and storage, and they must remain devoid of all possible inactivation processes. The shelf life of a protein depends on both the intrinsic nature of the protein and the storage conditions. Proteins (especially enzymes) must be stored at an appropriate temperature and pH range and frequently in the presence of concentrated (approximately 1 M) glycerol, sucrose, or a similar substance, for the proteins to retain activity and prevent aggregation. This article discusses the major causes of protein inactivation and describes a range of measures that can be adopted to maintain the stability and solubility of proteins.
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Structural and functional characterization of recombinant human serum transferrin secreted from Pichia pastoris. Biosci Biotechnol Biochem 2010; 74:309-15. [PMID: 20139607 DOI: 10.1271/bbb.90635] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Serum transferrin is an iron-binding glycoprotein with a bilobal structure. It binds iron ions in the blood serum and delivers them into target cells via transferrin receptor. We identified structural and functional characteristics of recombinant human transferrin which is produced in the yeast Pichia pastoris. Using the signal sequence of the alpha factor of the yeast Saccharomyces cerevisiae, high-level secretion was obtained, up to 30 mg/l of culture medium. Correct processing at designed sites was confirmed by N-terminal sequence analysis. Carbohydrate modification was determined by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF-MS) analysis after digestion with endo-beta-N-acetylglucosaminidase H. Reflecting the secondary structure, the circular dichroism spectrum of the recombinant protein was indistinguishable from that of serum transferrin. Consequently, the recombinant product had an iron binding function just as the serum specimen has: two Fe(3+) sites existed in a recombinant transferrin molecule, as estimated by titration analysis using visible absorption, fluorescence spectra, and electrophoretic behavior in urea denaturing polyacrylamide gel electrophoresis (PAGE).
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Properties of a homogeneous C-lobe prepared by introduction of a TEV cleavage site between the lobes of human transferrin. Protein Expr Purif 2010; 72:32-41. [PMID: 20064616 DOI: 10.1016/j.pep.2010.01.008] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2009] [Revised: 01/04/2010] [Accepted: 01/05/2010] [Indexed: 11/20/2022]
Abstract
Essential to iron transport and delivery, human serum transferrin (hTF) is a bilobal glycoprotein capable of reversibly binding one ferric ion in each lobe (the N- and C-lobes). A complete description of iron release from hTF, as well as insight into the physiological significance of the bilobal structure, demands characterization of the isolated lobes. Although production of large amounts of isolated N-lobe and full-length hTF has been well documented, attempts to produce the C-lobe (by recombinant and/or proteolytic approaches) have met with more limited success. Our new strategy involves replacing the hepta-peptide, PEAPTDE (comprising the bridge between the lobes) with the sequence ENLYFQ/G in a His-tagged non-glycosylated monoferric hTF construct, designated Fe(C)hTF. The new bridge sequence of this construct, designated Fe(C)TEV hTF, is readily cleaved by the tobacco etch virus (TEV) protease yielding non-glycosylated C-lobe. Following nickel column chromatography (to remove the N-lobe and the TEV protease which are both His tagged), the homogeneity of the C-lobe has been confirmed by mass spectroscopy. Differing reactivity with a monoclonal antibody specific to the C-lobe indicates that introduction of the TEV cleavage site into the bridge alters its conformation. The spectral and kinetic properties of the isolated C-lobe differ significantly from those of the isolated N-lobe.
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Kumar R, Mauk AG. Atypical Effects of Salts on the Stability and Iron Release Kinetics of Human Transferrin. J Phys Chem B 2009; 113:12400-9. [DOI: 10.1021/jp903257c] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Rajesh Kumar
- Department of Biochemistry and Molecular Biology and the Centre for Blood Research, University of British Columbia, Vancouver, B.C. V6T 1Z3 Canada
| | - A. Grant Mauk
- Department of Biochemistry and Molecular Biology and the Centre for Blood Research, University of British Columbia, Vancouver, B.C. V6T 1Z3 Canada
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Yamniuk AP, Burling H, Vogel HJ. Thermodynamic characterization of the interactions between the immunoregulatory proteins osteopontin and lactoferrin. Mol Immunol 2009; 46:2395-402. [DOI: 10.1016/j.molimm.2009.04.024] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2009] [Accepted: 04/16/2009] [Indexed: 11/29/2022]
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Calorimetric studies of the interaction between the insulin-enhancing drug candidate bis(maltolato)oxovanadium(IV) (BMOV) and human serum apo-transferrin. J Inorg Biochem 2008; 103:643-7. [PMID: 19056126 DOI: 10.1016/j.jinorgbio.2008.10.009] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2008] [Revised: 10/01/2008] [Accepted: 10/08/2008] [Indexed: 10/21/2022]
Abstract
Bis(maltolato)oxovanadium(IV) (BMOV), and its ethylmaltol analog, bis(ethylmaltolato)oxovanadium(IV) (BEOV), are candidate insulin-enhancing agents for the treatment of type 2 diabetes mellitus; in mid-2008, BEOV advanced to phase II clinical testing. The interactions of BMOV and its inorganic congener, vanadyl sulfate (VOSO(4)), with human serum apo-transferrin (hTf) were investigated using differential scanning calorimetry (DSC). Addition of BMOV or VOSO(4) to apo-hTf resulted in an increase in thermal stability of both the C- and N-lobes of transferrin as a result of binding to either vanadyl compound. A series of DSC thermograms of hTf solutions containing different molar ratios of BMOV and VOSO(4) were used to determine binding constants; at 25 degrees C the binding constants of BMOV to the C- and N-lobes of apo-hTf were found to be 3 (+/-1)x10(5) and 1.8 (+/-0.7)x10(5)M(-1), respectively. The corresponding values for VOSO(4) were 1.7 (+/-0.3)x10(5) and 7 (+/-2)x10(4)M(-1). The results show that the vanadium species initially presented as either BMOV or VOSO(4) had similar affinities for human serum transferrin due to oxidation of solvated vanadyl(IV) prior to complexation to transferrin. Binding of metavanadate (VO(3)(-)) was confirmed by DSC and isothermal titration calorimetry (ITC) experiments of the interaction between sodium metavanadate (NaVO(3)) and hTf.
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Effect of glycosylation on the extracellular domain of the Ag43 bacterial autotransporter: enhanced stability and reduced cellular aggregation. Biochem J 2008; 412:563-77. [DOI: 10.1042/bj20071497] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Autotransporters constitute the biggest group of secreted proteins in Gram-negative bacteria and contain a membrane-bound β-domain and a passenger domain secreted to the extracellular environment via an unusually long N-terminal sequence. Several passenger domains are known to be glycosylated by cytosolic glycosyl transferases, promoting bacterial attachment to mammalian cells. In the present study we describe the effect of glycosylation on the extracellular passenger domain of the Escherichia coli autotransporter Ag43α, which induces frizzy colony morphology and cell settling. We identify 16 glycosylation sites and suggest two possible glycosylation motifs for serine and threonine residues. Glycosylation stabilizes against thermal and chemical denaturation and increases refolding kinetics. Unexpectedly, glycosylation also reduces the stabilizing effect of Ca2+ ions, removes the ability of Ca2+ to promote cell adhesion, reduces the ability of Ag43α-containing cells to form bacterial amyloid and increases the susceptibility of the resulting amyloid to proteolysis. In addition, our results indicate that Ag43α folds without a stable intermediate, unlike pertactin, indicating that autotransporters may arrive at the native state by a variety of different mechanisms despite a common overall structure. A small but significant fraction of Ag43α can survive intact in the periplasm if expressed without the β-domain, suggesting that it is able to adopt a protease-resistant structure prior to translocation across the membrane. The present study demonstrates that glycosylation may play significant roles in structural and functional properties of bacterial autotransporters at many different levels.
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Conesa C, Sánchez L, Rota C, Pérez MD, Calvo M, Farnaud S, Evans RW. Isolation of lactoferrin from milk of different species: Calorimetric and antimicrobial studies. Comp Biochem Physiol B Biochem Mol Biol 2008; 150:131-9. [DOI: 10.1016/j.cbpb.2008.02.005] [Citation(s) in RCA: 111] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2008] [Revised: 02/15/2008] [Accepted: 02/15/2008] [Indexed: 11/16/2022]
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35
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On the evolutionary significance and metal-binding characteristics of a monolobal transferrin from Ciona intestinalis. Proc Natl Acad Sci U S A 2008; 105:3268-73. [PMID: 18287008 DOI: 10.1073/pnas.0705037105] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Transferrins are a family of proteins that bind and transport Fe(III). Modern transferrins are typically bilobal and are believed to have evolved from an ancient gene duplication of a monolobal form. A novel monolobal transferrin, nicatransferrin (nicaTf), was identified in the primitive ascidian species Ciona intestinalis that possesses the characteristic features of the proposed ancestral Tf protein. In this work, nicaTf was expressed in Pichia pastoris. Extensive solution studies were performed on nicaTf, including UV-vis, fluorescence, CD, EPR and NMR spectroscopies, and electrospray time-of-flight mass spectrometry. The expressed protein is nonglycosylated, unlike the protein isolated from the organism. This property does not affect its ability to bind Fe(III). However, Fe(III)-bound nicaTf displays important spectral differences from other Fe(III)-bound transferrins, which are likely the consequence of differences in metal coordination. Coordination differences could also account for the weaker affinity of nicaTf for Fe(III) (log K = 18.5) compared with bilobal human serum transferrin (HsTf) (log K = 22.5 and 21.4). The Fe-nicaTf complex is not labile, as indicated by slow metal removal kinetics by the high-affinity chelator tiron at pH 7.4. The protein alternatively binds up to one equivalent of Ti(IV) or V(V), which suggests that it may transport nonferric metals. These solution studies provide insight into the structure and function of the primitive monolobal transferrin of C. intestinalis for comparison with higher order bilobal transferrins. They suggest that a major advantage for the evolution of modern transferrins, dominantly of bilobal form, is stronger Fe(III) affinity because of cooperativity.
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Kern S, Riester D, Hildmann C, Schwienhorst A, Meyer-Almes FJ. Inhibitor-mediated stabilization of the conformational structure of a histone deacetylase-like amidohydrolase. FEBS J 2007; 274:3578-3588. [PMID: 17627667 DOI: 10.1111/j.1742-4658.2007.05887.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
Histone deacetylases are major regulators of eukaryotic gene expression. Not unexpectedly, histone deacetylases are among the most promising targets in cancer therapy. However, despite huge efforts in histone deacetylase inhibitor design, very little is known about the impact of histone deacetylase inhibitors on enzyme stability. In this study, the conformational stability of a well-established histone deacetylase homolog with high structural similarity (histone deacetylase-like amidohydrolase from Bordetella/Alcaligenes species FB188) was investigated using denaturation titrations and stopped-flow kinetics. Based on the results of these complementary approaches, we conclude that the interconversion of native histone deacetylase-like amidohydrolase into its denatured form involves several intermediates possessing different enzyme activities and conformational structures. The refolding kinetics has shown to be strongly dependent on Zn(2+) and to a lesser extent on K(+), which underlines their importance not only for catalytic function but also for maintaining the correct conformational structure of the enzyme. Two main unfolding processes of histone deacetylase-like amidohydrolase were differentiated. The unfolding occurring at submolar concentrations of the denaturant guanidine hydrochloride was not affected by inhibitor binding, whereas the unfolding at higher concentrations of guanidine hydrochloride was strongly affected. It was shown that the known inhibitors suberoylanilide hydroxamic acid and cyclopentylpropionyl hydroxamate are capable of stabilizing the conformational structure of histone deacetylase-like amidrohydrolase. Judging from the free energies of unfolding, the protein stability was increased by 9.4 and 5.4 kJ.mol(-1) upon binding of suberoylanilide hydroxamic acid and cyclopentylpropionyl hydroxamate, respectively.
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Affiliation(s)
- Stefanie Kern
- Department of Chemical Engineering and Biotechnology, Darmstadt University of Applied Sciences, Germany Institut für Molekulare Genetik und Praeparative Molekularbiologie, Institut fuer Mikrobiologie und Genetik, Goettingen, Germany
| | - Daniel Riester
- Department of Chemical Engineering and Biotechnology, Darmstadt University of Applied Sciences, Germany Institut für Molekulare Genetik und Praeparative Molekularbiologie, Institut fuer Mikrobiologie und Genetik, Goettingen, Germany
| | - Christian Hildmann
- Department of Chemical Engineering and Biotechnology, Darmstadt University of Applied Sciences, Germany Institut für Molekulare Genetik und Praeparative Molekularbiologie, Institut fuer Mikrobiologie und Genetik, Goettingen, Germany
| | - Andreas Schwienhorst
- Department of Chemical Engineering and Biotechnology, Darmstadt University of Applied Sciences, Germany Institut für Molekulare Genetik und Praeparative Molekularbiologie, Institut fuer Mikrobiologie und Genetik, Goettingen, Germany
| | - Franz-Josef Meyer-Almes
- Department of Chemical Engineering and Biotechnology, Darmstadt University of Applied Sciences, Germany Institut für Molekulare Genetik und Praeparative Molekularbiologie, Institut fuer Mikrobiologie und Genetik, Goettingen, Germany
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Wally J, Buchanan SK. A structural comparison of human serum transferrin and human lactoferrin. Biometals 2007; 20:249-62. [PMID: 17216400 PMCID: PMC2547852 DOI: 10.1007/s10534-006-9062-7] [Citation(s) in RCA: 79] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2006] [Accepted: 11/28/2006] [Indexed: 12/01/2022]
Abstract
The transferrins are a family of proteins that bind free iron in the blood and bodily fluids. Serum transferrins function to deliver iron to cells via a receptor-mediated endocytotic process as well as to remove toxic free iron from the blood and to provide an anti-bacterial, low-iron environment. Lactoferrins (found in bodily secretions such as milk) are only known to have an anti-bacterial function, via their ability to tightly bind free iron even at low pH, and have no known transport function. Though these proteins keep the level of free iron low, pathogenic bacteria are able to thrive by obtaining iron from their host via expression of outer membrane proteins that can bind to and remove iron from host proteins, including both serum transferrin and lactoferrin. Furthermore, even though human serum transferrin and lactoferrin are quite similar in sequence and structure, and coordinate iron in the same manner, they differ in their affinities for iron as well as their receptor binding properties: the human transferrin receptor only binds serum transferrin, and two distinct bacterial transport systems are used to capture iron from serum transferrin and lactoferrin. Comparison of the recently solved crystal structure of iron-free human serum transferrin to that of human lactoferrin provides insight into these differences.
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Affiliation(s)
- Jeremy Wally
- National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, 50 South Drive, Bethesda, MD 20892 USA
| | - Susan K. Buchanan
- National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, 50 South Drive, Bethesda, MD 20892 USA
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38
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Shnyrova AV, Oliveira CS, Sarmento AC, Barros MT, Zhadan GG, Roig MG, Shnyrov VL. Effect of acetonitrile on Cynara cardunculus L. cardosin A stability. Int J Biol Macromol 2006; 39:273-9. [PMID: 16712922 DOI: 10.1016/j.ijbiomac.2006.04.007] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2006] [Accepted: 04/05/2006] [Indexed: 11/28/2022]
Abstract
The kinetics of the structural changes affecting cardosin A, a plant aspartic proteinase (AP) from Cynara cardunculus L., in the presence of a mixture of acetonitrile (AN) in water (W) was studied. Incubation of cardosin A with 10% (v/v) AN resulted in a gradual increase in protein helicity, accompanied by changes in the tertiary structure, seen by changes in the intrinsic fluorescence of tryptophan. Differential scanning calorimetry (DSC) revealed that the temperature of denaturation of cardosin A decreased upon the addition of AN. With longer incubation times, the small chain of cardosin A denatured completely, consequent exposure of the single tryptophan residue accounting well for the observed spectral shift intrinsic fluorescence of the protein. Enzymatic activity assays demonstrated that the kinetically determined unfolding of the small chain of cardosin A does not result in loss of the activity of this enzyme.
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Affiliation(s)
- Anna V Shnyrova
- Departamento de Bioquímica y Biología Molecular, Universidad de Salamanca, Salamanca, Spain
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Wally J, Halbrooks PJ, Vonrhein C, Rould MA, Everse SJ, Mason AB, Buchanan SK. The crystal structure of iron-free human serum transferrin provides insight into inter-lobe communication and receptor binding. J Biol Chem 2006; 281:24934-44. [PMID: 16793765 PMCID: PMC1895924 DOI: 10.1074/jbc.m604592200] [Citation(s) in RCA: 194] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
Serum transferrin reversibly binds iron in each of two lobes and delivers it to cells by a receptor-mediated, pH-dependent process. The binding and release of iron result in a large conformational change in which two subdomains in each lobe close or open with a rigid twisting motion around a hinge. We report the structure of human serum transferrin (hTF) lacking iron (apo-hTF), which was independently determined by two methods: 1) the crystal structure of recombinant non-glycosylated apo-hTF was solved at 2.7-A resolution using a multiple wavelength anomalous dispersion phasing strategy, by substituting the nine methionines in hTF with selenomethionine and 2) the structure of glycosylated apo-hTF (isolated from serum) was determined to a resolution of 2.7A by molecular replacement using the human apo-N-lobe and the rabbit holo-C1-subdomain as search models. These two crystal structures are essentially identical. They represent the first published model for full-length human transferrin and reveal that, in contrast to family members (human lactoferrin and hen ovotransferrin), both lobes are almost equally open: 59.4 degrees and 49.5 degrees rotations are required to open the N- and C-lobes, respectively (compared with closed pig TF). Availability of this structure is critical to a complete understanding of the metal binding properties of each lobe of hTF; the apo-hTF structure suggests that differences in the hinge regions of the N- and C-lobes may influence the rates of iron binding and release. In addition, we evaluate potential interactions between apo-hTF and the human transferrin receptor.
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Affiliation(s)
- Jeremy Wally
- From National Institute of Diabetes & Digestive & Kidney Diseases, National Institutes of Health, 50 South Drive, Bethesda, MD 20892 USA
| | - Peter J. Halbrooks
- Department of Biochemistry, University of Vermont, College of Medicine, 89 Beaumont Avenue, Burlington, VT 05405 USA
| | - Clemens Vonrhein
- Global Phasing Ltd., Sheraton House, Castle Park, Cambridge, CB3 0AX, UK, and
| | - Mark A. Rould
- Department of Molecular Physiology and Biophysics, University of Vermont, College of Medicine, 89 Beaumont Avenue, Burlington, VT 05405 USA
| | - Stephen J. Everse
- Department of Biochemistry, University of Vermont, College of Medicine, 89 Beaumont Avenue, Burlington, VT 05405 USA
| | - Anne B. Mason
- Department of Biochemistry, University of Vermont, College of Medicine, 89 Beaumont Avenue, Burlington, VT 05405 USA
| | - Susan K. Buchanan
- From National Institute of Diabetes & Digestive & Kidney Diseases, National Institutes of Health, 50 South Drive, Bethesda, MD 20892 USA
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40
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Kaltashov IA, Zhang M, Eyles SJ, Abzalimov RR. Investigation of structure, dynamics and function of metalloproteins with electrospray ionization mass spectrometry. Anal Bioanal Chem 2006; 386:472-81. [PMID: 16932945 DOI: 10.1007/s00216-006-0636-6] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2006] [Revised: 06/06/2006] [Accepted: 06/19/2006] [Indexed: 10/24/2022]
Abstract
Electrospray ionization mass spectrometry (ESI MS) has emerged recently as a powerful tool for analyzing many structural and behavioral aspects of metalloproteins in great detail. In this review we discuss recent developments in the field, placing particular emphasis on the unique features of ESI MS that lend themselves to metalloprotein characterization at a variety of levels. Direct mass measurement enables the determination of protein-metal ion binding stoichiometry in solution and metalloprotein higher order structure in the case of multi-subunit proteins. MS techniques have been developed for determining the locations of metal-binding centers, metal oxidation states and reaction intermediates of metal-containing enzymes. Other ESI MS techniques are also discussed, such as protein ion charge state distributions and hydrogen/deuterium exchange studies, which can be used to measure metal binding affinities and to shed light on vital dynamic aspects of the functional properties of metalloproteins endowed by metal binding.
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Affiliation(s)
- Igor A Kaltashov
- Department of Chemistry, University of Massachusetts-Amherst, 710 North Pleasant Street, Amherst, MA 01003, USA.
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41
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Zecchinon L, Oriol A, Netzel U, Svennberg J, Gerardin-Otthiers N, Feller G. Stability domains, substrate-induced conformational changes, and hinge-bending motions in a psychrophilic phosphoglycerate kinase. A microcalorimetric study. J Biol Chem 2005; 280:41307-14. [PMID: 16227206 DOI: 10.1074/jbc.m506464200] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The cold-active phosphoglycerate kinase from the Antarctic bacterium Pseudomonas sp. TACII18 exhibits two distinct stability domains in the free, open conformation. It is shown that these stability domains do not match the structural N- and C-domains as the heat-stable domain corresponds to about 80 residues of the C-domain, including the nucleotide binding site, whereas the remaining of the protein contributes to the main heat-labile domain. This was demonstrated by spectroscopic and microcalorimetric analyses of the native enzyme, of its mutants, and of the isolated recombinant structural domains. It is proposed that the heat-stable domain provides a compact structure improving the binding affinity of the nucleotide, therefore increasing the catalytic efficiency at low temperatures. Upon substrate binding, the enzyme adopts a uniformly more stable closed conformation. Substrate-induced stability changes suggest that the free energy of ligand binding is converted into an increased conformational stability used to drive the hinge-bending motions and domain closure.
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Affiliation(s)
- Laurent Zecchinon
- Laboratory of Biochemistry, University of Liège, Institute of Chemistry B6a, B-4000 Liège-Sart Tilman, Belgium
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42
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Gavel OY, Bursakov SA, Pina DG, Zhadan GG, Moura JJG, Moura I, Shnyrov VL. Structural stability of adenylate kinase from the sulfate-reducing bacteria Desulfovibrio gigas. Biophys Chem 2005; 110:83-92. [PMID: 15223146 DOI: 10.1016/j.bpc.2004.01.006] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2003] [Revised: 01/21/2004] [Accepted: 01/22/2004] [Indexed: 11/17/2022]
Abstract
A novel adenylate kinase (AK) has recently been purified from Desulfovibrio gigas and characterized as a Co(2+)/Zn(2+)-containing enzyme: this is an unusual characteristic for AKs from Gram-negative bacteria, in which these enzymes are normally devoid of metals. Here, we studied the conformational stability of holo- and apo-AK as a function of temperature by differential scanning calorimetry (DSC), circular dichroism (CD), and intrinsic fluorescence spectroscopy. The thermal unfolding of AK is a cooperative two-state process, and is sufficiently reversible in the 9-11 pH range, that can be correctly interpreted in terms of a simple two-state thermodynamic model. The spectral parameters as monitored by ellipticity changes in the CD spectra of the enzyme as well as the decrease in tryptophan intensity emission upon heating were seen to be good complements to the highly sensitive but integral DSC-method.
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Affiliation(s)
- Olga Yu Gavel
- Departamento de Química, Centro de Química Fina e Biotecnologia, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal
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43
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Creagh AL, Tiong JWC, Tian MM, Haynes CA, Jefferies WA. Calorimetric studies of melanotransferrin (p97) and its interaction with iron. J Biol Chem 2005; 280:15735-41. [PMID: 15705575 DOI: 10.1074/jbc.m414650200] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The mammalian molecule melanotransferrin (mTf), also called p97, is a member of the transferrin family of molecules. It exists in both secreted and glycosylphosphatidylinositol-anchored forms and is thought to play a role in angiogenesis and in transporting iron across the blood brain barrier. The binding affinity of iron to this molecule has not been formally established. Here, the binding of ferric ion (chelated with a 2-fold molar ratio of nitrilotriacetate) to mTf has been studied using isothermal titration calorimetry and differential scanning calorimetry. One iron-binding site was determined for mTf with similar binding characteristics to other transferrins. In the absence of bicarbonate, binding occurs quickly with an apparent association constant of 2.6 x 10(7) M(-1) at 25 degrees C. The presence of bicarbonate introduces kinetic effects that prevent direct determination of the apparent binding constant by isothermal titration calorimetry. Differential scanning calorimetry thermograms of mTf unfolding in the presence and absence of iron were therefore used to determine the apparent binding constant in the bicarbonate-containing system; at pH 7.5 and 25 degrees C, iron binding occurs in a 1:1 ratio with a K(app) of 4.4 x 10(17) M(-1). This affinity is intermediate between the high and low affinity lobes of transferrin and suggests that mTf is likely to play a significant role in iron transport where the high affinity lobe of transferrin is occupied or where transferrin is in proportionally low concentrations.
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Affiliation(s)
- A Louise Creagh
- Michael Smith Laboratories and Biomedical Research Centre, Department of Microbiology and Immunology, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada
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Yang B, Feng J, Li Y, Gao F, Zhao Y, Wang J. Spectral studies on aluminum ion binding to the ligands with phenolic group(s): implications for the differences between N- and C-terminal binding sites of human serum apotransferrin. J Inorg Biochem 2003; 96:416-24. [PMID: 12888278 DOI: 10.1016/s0162-0134(03)00241-1] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Both the binding and releasing of ferric ions in C-, and N-terminal binding sites of human serum transferrin are different. To understand the difference here the interactions of aluminum with the ligands containing phenolic group(s), including 8-hydroxyquinoline, salicylic acid, N,N'-di(2-hydroxybenzyl)ethylenediamine-N,N'-diacetic acid, N,N'-ethylenebis[2-(o-hydroxyphenolic)glycine], and human serum apotransferrin, respectively, are investigated by using UV difference and fluorescence spectra methods in 0.1 M N-2-hydroxyethylpiperazine-N-2-ethanesulfonic acid at pH 7.4. Aluminum binding produces a UV difference peak near 235 nm that is characteristic of phenolic groups binding to aluminum. The peak at 235 nm has been used to determine conditional binding constants of log K(Al-HBED)=8.88+/-0.74 and log K(Al-EHPG)=9.38+/-0.03. However, the effects of aluminum binding on the fluorescence intensity of N,N'-ethylenebis[2-(o-hydroxyphenolic)glycine], salicylic acid and N,N'-di(2-hydroxybenzyl) ethylenediamine-N,N'-diacetic acid, 8-hydroxyquinoline are disparate, the former showing a decrease and the latter an increase. At pH 7.4, there is N cdots, three dots, centered H-O type intramolecular hydrogen bond in 8-hydroxyquinoline, N,N'-di(2-hydroxybenzyl) ethylenediamine-N,N'-diacetic acid and O cdots, three dots, centered H-O type intramolecular hydrogen bond in salicylic acid, N,N'-ethylenebis[2-(o-hydroxyphenolic)glycine]. The effects of salts on the fluorescence intensity of the ligands containing phenolic group(s) show that fluorescence emission increases with the breaking of an N cdots, three dots, centered H-O type intramolecular hydrogen bond and fluorescence emission decreases with the breaking of an O cdots, three dots, centered H-O type intramolecular hydrogen bond. Fluorescence titrations of apotransferrin and both forms of monoferric transferrin with aluminum indicated that there is O cdots, three dots, centered H-O type intramolecular hydrogen bonds for the phenolic groups of Tyr426 and Tyr517 in the C-terminal binding site. While N cdots, three dots, centered H-O type intramolecular hydrogen bonds are found for the phenolic groups of Tyr95 and Tyr188 in the N-terminal binding site.
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Affiliation(s)
- Binsheng Yang
- Institute of Molecular Science, Shanxi University, No. 36 Wucheng Road, 030006, Taiyuan, China.
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Bounds PL, Sutter B, Koppenol WH. Studies of metal-binding properties of Cu,Zn superoxide dismutase by isothermal titration calorimetry. Methods Enzymol 2002; 349:115-23. [PMID: 11912901 DOI: 10.1016/s0076-6879(02)49327-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/24/2023]
Affiliation(s)
- Patricia L Bounds
- Laboratory of Inorganic Chemistry, Eidgenössische Technische Hochschule, CH-8093 Zurich, Switzerland
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Lin LN, Brandts JF, Brandts JM, Plotnikov V. Determination of the volumetric properties of proteins and other solutes using pressure perturbation calorimetry. Anal Biochem 2002; 302:144-60. [PMID: 11846388 DOI: 10.1006/abio.2001.5524] [Citation(s) in RCA: 150] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Pressure perturbation calorimetry is a new technique that measures the heat change in a solution that results when the pressure above the solution is changed. When used in a differential calorimeter containing a dilute solution of solute in the sample cell and the corresponding buffer in the reference cell, the measured differential heat can be used to calculate the thermal coefficient of expansion of the partial volume of the solute, alpha. For proteins in dilute aqueous solution, alpha is dominated by a temperature-dependent contribution arising from the interaction of protein groups with water at the protein-solvent interface. This arises due to the effect of the protein groups on the hydrogen-bonded structure of water, and thereby clearly differentiates between structure-making hydrophobic groups and structure-breaking hydrophilic groups. This solvation contribution to alpha can be accentuated in solvents having more structure (deuterium oxide) than water and attenuated in solvents having less structure (2.8 M guanidinium sulfate). Six different proteins (chymotrypsinogen, pepsinogen, lysozyme, bovine pancreatic trypsin inhibitor, ribonuclease A, and T4 lysozyme) were examined carefully by this technique, allowing estimates of various volumetric parameters including the volume change resulting from thermal unfolding of each protein. For ribonuclease A, results obtained in both water and deuterium oxide led to an estimate of the accessible surface area of the native protein of approximately 45% relative to the fully reduced unfolded protein. Also, it was also found that ligand binding to ribonuclease A led to changes in alpha, suggesting a burial of some surface area in the ligand-protein complex.
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Affiliation(s)
- Lung-Nan Lin
- MicroCal, LLC, 20 Industrial Drive East, Northampton, Massachusetts 01060, USA
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Xie H, Huff GR, Huff WE, Balog JM, Holt P, Rath NC. Identification of ovotransferrin as an acute phase protein in chickens. Poult Sci 2002; 81:112-20. [PMID: 11885890 DOI: 10.1093/ps/81.1.112] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Inflammation is homeostatic process associated with a variety of cellular injuries resulting from infections, toxicosis, and physical trauma. The studies on inflammation in avian species are limited. To understand the inflammation-induced changes, 4-wk-old male broiler chickens were subjected to experimental inflammation by a subcutaneous injection of croton oil (inflammatory) with changes in serum measured over time and were compared with birds treated similarly with olive oil (injected control). Croton oil treatment significantly elevated serum interleukin (IL)-6 concentrations and heterophil counts by 6 and 16 h postinjection, respectively, which returned to the basal levels of controls at 16 and 24 h, respectively. Croton oil treatment affected the serum protein profiles of chickens as assessed by SDS-PAGE and densitometric analyses. Compared with olive oil-injected or noninjected chicken sera, there were increases in the density of protein bands corresponding to molecular weights (MW) of 42, 65, 200, and 219 kDa and decreases in bands corresponding to 49 kDa (serum albumin) and a 56-kDa protein in chickens treated with croton oil. Most of these changes were evident at 24 h and lasted through 48 h. The protein band corresponding to 65 kDa was further characterized using two-dimensional gel electrophoresis and N-terminal sequence analyses. A sequence similarity search in the Genbank database using the first 22 amino acids yielded a complete homology with chicken ovotransferrin. Western blot analysis using antichicken serum transferrin or antichicken ovotransferrin antibodies also confirmed the 65-kDa protein band to be ovotransferrin. Under nonreducing conditions, the ovotransferrin standard also showed an apparent MW corresponding to 65 kDa, like the serum transferrin. The serum ovotransferrin was found to be glycosylated using a glycoprotein stain. Although the significance of ovotransferrin in avian inflammation is not clear, these results show that it is a major acute phase protein (APP) in chickens.
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Affiliation(s)
- H Xie
- USDA-ARS-Poultry Production and Product Safety Research Unit, University of Arkansas, Fayetteville 72701, USA
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Khajeh K, Ranjbar B, Naderi-Manesh H, Ebrahim Habibi A, Nemat-Gorgani M. Chemical modification of bacterial alpha-amylases: changes in tertiary structures and the effect of additional calcium. BIOCHIMICA ET BIOPHYSICA ACTA 2001; 1548:229-37. [PMID: 11513968 DOI: 10.1016/s0167-4838(01)00236-9] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A comparative study was performed on the effect of calcium on native and chemically modified forms of mesophilic and thermophilic alpha-amylases. Circular dichroism (CD) and irreversible thermoinactivation studies were carried out in the absence and presence of 10 mM calcium. From the CD experiments, changes in the tertiary structure of these enzymes, brought about by modification, were concluded. Furthermore, these changes were found to be influenced by the presence of calcium. Sorbitol was very effective in affording protection against irreversible thermoinactivation of native and modified forms of the enzymes, both in the absence and presence of calcium. Results are discussed in terms of the usefulness of this new approach involving a combination of medium and chemical modification for protein stabilization and enhancement of catalytic potential.
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Affiliation(s)
- K Khajeh
- Institute of Biochemistry and Biophysics, University of Tehran, Iran
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50
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Cai Y, Xie Q, Zhou A, Zhang Y, Yao S. A piezoelectric quartz crystal impedance study on Cu(2+)-induced precipitation of bovine serum albumin in aqueous solution. JOURNAL OF BIOCHEMICAL AND BIOPHYSICAL METHODS 2001; 47:209-19. [PMID: 11245892 DOI: 10.1016/s0165-022x(00)00140-8] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Piezoelectric quartz crystal impedance (QCI) technique was used for monitoring the Cu(2+)-induced precipitation of bovine serum albumin onto the gold electrode. The critical precipitate concentration of Cu(2+) reflected by the significant decrease in the resonant frequency was estimated to be 9.98 x 10(-5) mol x l(-1), and the saturated adherence of the precipitate on the electrode occurred when the Cu(2+) concentration was greater than 9.79x10(-3) mol x l(-1). The frequency shift in air was about 85.5% of that in liquid, and the Deltaf(0)/DeltaR(1) ratio found in solution was 82.67 Hz Omega(-1), suggesting that the frequency response was predominated by the mass change due to precipitate adherence to the electrode surface. The response of the resonant frequency was analyzed using an equation Deltaf=a(0) + a(1) e(-t/tau(1)) + a(2) e(-t/tau(2)). The relationship between the total a(0) values and the Cu(2+) concentration was discussed.
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Affiliation(s)
- Y Cai
- Chemical Research Institute, Hunan Normal University, 410081, Changsha, PR China
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