1
|
Ansari M, Bhattacharjee S, Pantazis DA. Correlating Structure with Spectroscopy in Ascorbate Peroxidase Compound II. J Am Chem Soc 2024; 146:9640-9656. [PMID: 38530124 PMCID: PMC11009960 DOI: 10.1021/jacs.3c13169] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2023] [Revised: 03/15/2024] [Accepted: 03/15/2024] [Indexed: 03/27/2024]
Abstract
Structural and spectroscopic investigations of compound II in ascorbate peroxidase (APX) have yielded conflicting conclusions regarding the protonation state of the crucial Fe(IV) intermediate. Neutron diffraction and crystallographic data support an iron(IV)-hydroxo formulation, whereas Mössbauer, X-ray absorption (XAS), and nuclear resonance vibrational spectroscopy (NRVS) studies appear consistent with an iron(IV)-oxo species. Here we examine APX with spectroscopy-oriented QM/MM calculations and extensive exploration of the conformational space for both possible formulations of compound II. We establish that irrespective of variations in the orientation of a vicinal arginine residue and potential reorganization of proximal water molecules and hydrogen bonding, the Fe-O distances for the oxo and hydroxo forms consistently fall within distinct, narrow, and nonoverlapping ranges. The accuracy of geometric parameters is validated by coupled-cluster calculations with the domain-based local pair natural orbital approach, DLPNO-CCSD(T). QM/MM calculations of spectroscopic properties are conducted for all structural variants, encompassing Mössbauer, optical, X-ray absorption, and X-ray emission spectroscopies and NRVS. All spectroscopic observations can be assigned uniquely to an Fe(IV)═O form. A terminal hydroxy group cannot be reconciled with the spectroscopic data. Under no conditions can the Fe(IV)═O distance be sufficiently elongated to approach the crystallographically reported Fe-O distance. The latter is consistent only with a hydroxo species, either Fe(IV) or Fe(III). Our findings strongly support the Fe(IV)═O formulation of APX-II and highlight unresolved discrepancies in the nature of samples used across different experimental studies.
Collapse
Affiliation(s)
- Mursaleem Ansari
- Max-Planck-Institut für
Kohlenforschung, Kaiser-Wilhelm-Platz
1, Mülheim an der Ruhr 45470, Germany
| | - Sinjini Bhattacharjee
- Max-Planck-Institut für
Kohlenforschung, Kaiser-Wilhelm-Platz
1, Mülheim an der Ruhr 45470, Germany
| | - Dimitrios A. Pantazis
- Max-Planck-Institut für
Kohlenforschung, Kaiser-Wilhelm-Platz
1, Mülheim an der Ruhr 45470, Germany
| |
Collapse
|
2
|
The oxidative nuclease activity of human cytochrome c with mutations in Ω-loop C/D. BIOCHIMICA ET BIOPHYSICA ACTA. PROTEINS AND PROTEOMICS 2023; 1871:140897. [PMID: 36642204 DOI: 10.1016/j.bbapap.2023.140897] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2022] [Revised: 01/06/2023] [Accepted: 01/09/2023] [Indexed: 01/15/2023]
Abstract
Natural and artificial nucleases have extensive applications in biotechnology and biomedicine. The exploration of protein with potential DNA cleavage activity also inspires the design of artificial nuclease and helps to understand the physiological process of DNA damage. In this study, we engineered four human cytochrome c (Cyt c) mutants (N52S, N52A, I81N, and I81D Cyt c), which showed enhanced DNA cleavage activity and degradation in comparison with WT Cyt c, especially under acidic conditions. The mechanism assays revealed that the superoxide (O2•-) plays an important role in the nuclease reaction. The kinetic assays showed that the peroxidase activity of the I81D Cyt c mutant enhanced up to 9-fold at pH 5. This study suggests that the mutations of Ile81 and Asn52 in Ω-loop C/D are critical for the nuclease activity of Cyt c, which may have physiological significance in DNA damage and potential applications in biomedicine.
Collapse
|
3
|
Lučić M, Wilson MT, Tosha T, Sugimoto H, Shilova A, Axford D, Owen RL, Hough MA, Worrall JAR. Serial Femtosecond Crystallography Reveals the Role of Water in the One- or Two-Electron Redox Chemistry of Compound I in the Catalytic Cycle of the B-Type Dye-Decolorizing Peroxidase DtpB. ACS Catal 2022; 12:13349-13359. [PMID: 36366763 PMCID: PMC9638988 DOI: 10.1021/acscatal.2c03754] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2022] [Revised: 10/05/2022] [Indexed: 11/30/2022]
Abstract
![]()
Controlling the reactivity
of high-valent Fe(IV)–O
catalytic
intermediates, Compounds I and II, generated in heme enzymes upon
reaction with dioxygen or hydrogen peroxide, is important for function.
It has been hypothesized that the presence (wet) or absence (dry)
of distal heme pocket water molecules can influence whether Compound
I undergoes sequential one-electron additions or a concerted two-electron
reduction. To test this hypothesis, we investigate the role of water
in the heme distal pocket of a dye-decolorizing peroxidase utilizing
a combination of serial femtosecond crystallography and rapid kinetic
studies. In a dry distal heme site, Compound I reduction proceeds
through a mechanism in which Compound II concentration is low. This
reaction shows a strong deuterium isotope effect, indicating that
reduction is coupled to proton uptake. The resulting protonated Compound
II (Fe(IV)–OH) rapidly reduces to the ferric state, giving
the appearance of a two-electron transfer process. In a wet site,
reduction of Compound I is faster, has no deuterium effect, and yields
highly populated Compound II, which is subsequently reduced to the
ferric form. This work provides a definitive experimental test of
the hypothesis advanced in the literature that relates sequential
or concerted electron transfer to Compound I in wet or dry distal
heme sites.
Collapse
Affiliation(s)
- Marina Lučić
- School of Life Sciences, University of Essex, Wivenhoe Park,
Essex, ColchesterCO4 3SQ, U.K
| | - Michael T. Wilson
- School of Life Sciences, University of Essex, Wivenhoe Park,
Essex, ColchesterCO4 3SQ, U.K
| | - Takehiko Tosha
- RIKEN, Spring-8 Center, 1-1-1 Kouto, Sayo, Hyogo679-5148Japan
| | | | - Anastasya Shilova
- Diamond Light Source, Harwell Science and Innovation Campus, Oxfordshire, DidcotOX11 0DE, U.K
| | - Danny Axford
- Diamond Light Source, Harwell Science and Innovation Campus, Oxfordshire, DidcotOX11 0DE, U.K
| | - Robin L. Owen
- Diamond Light Source, Harwell Science and Innovation Campus, Oxfordshire, DidcotOX11 0DE, U.K
| | - Michael A. Hough
- School of Life Sciences, University of Essex, Wivenhoe Park,
Essex, ColchesterCO4 3SQ, U.K
- Diamond Light Source, Harwell Science and Innovation Campus, Oxfordshire, DidcotOX11 0DE, U.K
| | - Jonathan A. R. Worrall
- School of Life Sciences, University of Essex, Wivenhoe Park,
Essex, ColchesterCO4 3SQ, U.K
| |
Collapse
|
4
|
Geeraerts Z, Stiller OR, Lukat-Rodgers GS, Rodgers KR. Roles of High-Valent Hemes and pH Dependence in Halite Decomposition Catalyzed by Chlorite Dismutase from Dechloromonas aromatica. ACS Catal 2022; 12:8641-8657. [DOI: 10.1021/acscatal.2c01428] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Zachary Geeraerts
- Department of Chemistry and Biochemistry, North Dakota State University, Fargo, North Dakota 58108, United States
| | - Olivia R. Stiller
- Department of Chemistry and Biochemistry, North Dakota State University, Fargo, North Dakota 58108, United States
| | - Gudrun S. Lukat-Rodgers
- Department of Chemistry and Biochemistry, North Dakota State University, Fargo, North Dakota 58108, United States
| | - Kenton R. Rodgers
- Department of Chemistry and Biochemistry, North Dakota State University, Fargo, North Dakota 58108, United States
| |
Collapse
|
5
|
Nayek A, Ahmed ME, Samanta S, Dinda S, Patra S, Dey SG, Dey A. Bioinorganic Chemistry on Electrodes: Methods to Functional Modeling. J Am Chem Soc 2022; 144:8402-8429. [PMID: 35503922 DOI: 10.1021/jacs.2c01842] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
One of the major goals of bioinorganic chemistry has been to mimic the function of elegant metalloenzymes. Such functional modeling has been difficult to attain in solution, in particular, for reactions that require multiple protons and multiple electrons (nH+/ne-). Using a combination of heterogeneous electrochemistry, electrode and molecule design one may control both electron transfer (ET) and proton transfer (PT) of these nH+/ne- reactions. Such control can allow functional modeling of hydrogenases (H+ + e- → 1/2 H2), cytochrome c oxidase (O2 + 4 e- + 4 H+ → 2 H2O), monooxygenases (RR'CH2 + O2 + 2 e- + 2 H+ → RR'CHOH + H2O) and dioxygenases (S + O2 → SO2; S = organic substrate) in aqueous medium and at room temperatures. In addition, these heterogeneous constructs allow probing unnatural bioinspired reactions and estimation of the inner- and outer-sphere reorganization energy of small molecules and proteins.
Collapse
Affiliation(s)
- Abhijit Nayek
- School of Chemical Sciences, Indian Association for the Cultivation of Science, 2A Raja SC Mullick Road, Kolkata, WB India 700032
| | - Md Estak Ahmed
- School of Chemical Sciences, Indian Association for the Cultivation of Science, 2A Raja SC Mullick Road, Kolkata, WB India 700032
| | - Soumya Samanta
- School of Chemical Sciences, Indian Association for the Cultivation of Science, 2A Raja SC Mullick Road, Kolkata, WB India 700032
| | - Souvik Dinda
- School of Chemical Sciences, Indian Association for the Cultivation of Science, 2A Raja SC Mullick Road, Kolkata, WB India 700032
| | - Suman Patra
- School of Chemical Sciences, Indian Association for the Cultivation of Science, 2A Raja SC Mullick Road, Kolkata, WB India 700032
| | - Somdatta Ghosh Dey
- School of Chemical Sciences, Indian Association for the Cultivation of Science, 2A Raja SC Mullick Road, Kolkata, WB India 700032
| | - Abhishek Dey
- School of Chemical Sciences, Indian Association for the Cultivation of Science, 2A Raja SC Mullick Road, Kolkata, WB India 700032
| |
Collapse
|
6
|
Srinivas V, Banerjee R, Lebrette H, Jones JC, Aurelius O, Kim IS, Pham CC, Gul S, Sutherlin KD, Bhowmick A, John J, Bozkurt E, Fransson T, Aller P, Butryn A, Bogacz I, Simon P, Keable S, Britz A, Tono K, Kim KS, Park SY, Lee SJ, Park J, Alonso-Mori R, Fuller FD, Batyuk A, Brewster AS, Bergmann U, Sauter NK, Orville AM, Yachandra VK, Yano J, Lipscomb JD, Kern J, Högbom M. High-Resolution XFEL Structure of the Soluble Methane Monooxygenase Hydroxylase Complex with its Regulatory Component at Ambient Temperature in Two Oxidation States. J Am Chem Soc 2020; 142:14249-14266. [PMID: 32683863 DOI: 10.1021/jacs.0c05613] [Citation(s) in RCA: 37] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Soluble methane monooxygenase (sMMO) is a multicomponent metalloenzyme that catalyzes the conversion of methane to methanol at ambient temperature using a nonheme, oxygen-bridged dinuclear iron cluster in the active site. Structural changes in the hydroxylase component (sMMOH) containing the diiron cluster caused by complex formation with a regulatory component (MMOB) and by iron reduction are important for the regulation of O2 activation and substrate hydroxylation. Structural studies of metalloenzymes using traditional synchrotron-based X-ray crystallography are often complicated by partial X-ray-induced photoreduction of the metal center, thereby obviating determination of the structure of the enzyme in pure oxidation states. Here, microcrystals of the sMMOH:MMOB complex from Methylosinus trichosporium OB3b were serially exposed to X-ray free electron laser (XFEL) pulses, where the ≤35 fs duration of exposure of an individual crystal yields diffraction data before photoreduction-induced structural changes can manifest. Merging diffraction patterns obtained from thousands of crystals generates radiation damage-free, 1.95 Å resolution crystal structures for the fully oxidized and fully reduced states of the sMMOH:MMOB complex for the first time. The results provide new insight into the manner by which the diiron cluster and the active site environment are reorganized by the regulatory protein component in order to enhance the steps of oxygen activation and methane oxidation. This study also emphasizes the value of XFEL and serial femtosecond crystallography (SFX) methods for investigating the structures of metalloenzymes with radiation sensitive metal active sites.
Collapse
Affiliation(s)
- Vivek Srinivas
- Department of Biochemistry and Biophysics, Stockholm University, Arrhenius Laboratories for Natural Sciences, Stockholm 106 91, Sweden
| | - Rahul Banerjee
- Department of Biochemistry, Molecular Biology and Biophysics, University of Minnesota, Minneapolis, Minnesota 55391, United States
| | - Hugo Lebrette
- Department of Biochemistry and Biophysics, Stockholm University, Arrhenius Laboratories for Natural Sciences, Stockholm 106 91, Sweden
| | - Jason C Jones
- Department of Biochemistry, Molecular Biology and Biophysics, University of Minnesota, Minneapolis, Minnesota 55391, United States
| | - Oskar Aurelius
- Department of Biochemistry and Biophysics, Stockholm University, Arrhenius Laboratories for Natural Sciences, Stockholm 106 91, Sweden
| | - In-Sik Kim
- Molecular Biophysics and Integrated Bioimaging Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Cindy C Pham
- Molecular Biophysics and Integrated Bioimaging Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Sheraz Gul
- Molecular Biophysics and Integrated Bioimaging Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Kyle D Sutherlin
- Molecular Biophysics and Integrated Bioimaging Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Asmit Bhowmick
- Molecular Biophysics and Integrated Bioimaging Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Juliane John
- Department of Biochemistry and Biophysics, Stockholm University, Arrhenius Laboratories for Natural Sciences, Stockholm 106 91, Sweden
| | - Esra Bozkurt
- Department of Biochemistry and Biophysics, Stockholm University, Arrhenius Laboratories for Natural Sciences, Stockholm 106 91, Sweden
| | - Thomas Fransson
- Interdisciplinary Center for Scientific Computing, University of Heidelberg, 69120 Heidelberg, Germany
| | - Pierre Aller
- Diamond Light Source, Harwell Science and Innovation Campus, Didcot, Oxfordshire OX11 0DE, United Kingdom
| | - Agata Butryn
- Diamond Light Source, Harwell Science and Innovation Campus, Didcot, Oxfordshire OX11 0DE, United Kingdom
| | - Isabel Bogacz
- Molecular Biophysics and Integrated Bioimaging Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Philipp Simon
- Molecular Biophysics and Integrated Bioimaging Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Stephen Keable
- Molecular Biophysics and Integrated Bioimaging Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Alexander Britz
- LCLS, SLAC National Accelerator Laboratory, Menlo Park, California 94025, United States
| | - Kensuke Tono
- Japan Synchrotron Radiation Research Institute, Sayo-gun 679 5198, Japan
| | - Kyung Sook Kim
- Pohang Accelerator Laboratory, Gyeongsangbuk-do 37673, South Korea
| | - Sang-Youn Park
- Pohang Accelerator Laboratory, Gyeongsangbuk-do 37673, South Korea
| | - Sang Jae Lee
- Pohang Accelerator Laboratory, Gyeongsangbuk-do 37673, South Korea
| | - Jaehyun Park
- Pohang Accelerator Laboratory, Gyeongsangbuk-do 37673, South Korea
| | - Roberto Alonso-Mori
- LCLS, SLAC National Accelerator Laboratory, Menlo Park, California 94025, United States
| | - Franklin D Fuller
- LCLS, SLAC National Accelerator Laboratory, Menlo Park, California 94025, United States
| | - Alexander Batyuk
- LCLS, SLAC National Accelerator Laboratory, Menlo Park, California 94025, United States
| | - Aaron S Brewster
- Molecular Biophysics and Integrated Bioimaging Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Uwe Bergmann
- Stanford PULSE Institute, SLAC National Accelerator Laboratory, Menlo Park, California 94025, United States
| | - Nicholas K Sauter
- Molecular Biophysics and Integrated Bioimaging Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Allen M Orville
- Diamond Light Source, Harwell Science and Innovation Campus, Didcot, Oxfordshire OX11 0DE, United Kingdom.,Research Complex at Harwell, Rutherford Appleton Laboratory, Didcot, Oxfordshire OX11 0FA, United Kingdom
| | - Vittal K Yachandra
- Molecular Biophysics and Integrated Bioimaging Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Junko Yano
- Molecular Biophysics and Integrated Bioimaging Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - John D Lipscomb
- Department of Biochemistry, Molecular Biology and Biophysics, University of Minnesota, Minneapolis, Minnesota 55391, United States
| | - Jan Kern
- Molecular Biophysics and Integrated Bioimaging Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Martin Högbom
- Department of Biochemistry and Biophysics, Stockholm University, Arrhenius Laboratories for Natural Sciences, Stockholm 106 91, Sweden
| |
Collapse
|
7
|
Pfanzagl V, Beale JH, Michlits H, Schmidt D, Gabler T, Obinger C, Djinović-Carugo K, Hofbauer S. X-ray-induced photoreduction of heme metal centers rapidly induces active-site perturbations in a protein-independent manner. J Biol Chem 2020; 295:13488-13501. [PMID: 32723869 DOI: 10.1074/jbc.ra120.014087] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2020] [Revised: 07/24/2020] [Indexed: 12/31/2022] Open
Abstract
Since the advent of protein crystallography, atomic-level macromolecular structures have provided a basis to understand biological function. Enzymologists use detailed structural insights on ligand coordination, interatomic distances, and positioning of catalytic amino acids to rationalize the underlying electronic reaction mechanisms. Often the proteins in question catalyze redox reactions using metal cofactors that are explicitly intertwined with their function. In these cases, the exact nature of the coordination sphere and the oxidation state of the metal is of utmost importance. Unfortunately, the redox-active nature of metal cofactors makes them especially susceptible to photoreduction, meaning that information obtained by photoreducing X-ray sources about the environment of the cofactor is the least trustworthy part of the structure. In this work we directly compare the kinetics of photoreduction of six different heme protein crystal species by X-ray radiation. We show that a dose of ∼40 kilograys already yields 50% ferrous iron in a heme protein crystal. We also demonstrate that the kinetics of photoreduction are completely independent from variables unique to the different samples tested. The photoreduction-induced structural rearrangements around the metal cofactors have to be considered when biochemical data of ferric proteins are rationalized by constraints derived from crystal structures of reduced enzymes.
Collapse
Affiliation(s)
- Vera Pfanzagl
- Department of Chemistry, Institute of Biochemistry, BOKU-University of Natural Resources and Life Sciences, Vienna, Austria.
| | | | - Hanna Michlits
- Department of Chemistry, Institute of Biochemistry, BOKU-University of Natural Resources and Life Sciences, Vienna, Austria
| | - Daniel Schmidt
- Department of Chemistry, Institute of Biochemistry, BOKU-University of Natural Resources and Life Sciences, Vienna, Austria
| | - Thomas Gabler
- Department of Chemistry, Institute of Biochemistry, BOKU-University of Natural Resources and Life Sciences, Vienna, Austria
| | - Christian Obinger
- Department of Chemistry, Institute of Biochemistry, BOKU-University of Natural Resources and Life Sciences, Vienna, Austria
| | - Kristina Djinović-Carugo
- Department of Structural and Computational Biology, Max Perutz Labs, University of Vienna, Vienna, Austria; Department of Biochemistry, Faculty of Chemistry and Chemical Technology, University of Ljubljana, Ljubljana, Slovenia
| | - Stefan Hofbauer
- Department of Chemistry, Institute of Biochemistry, BOKU-University of Natural Resources and Life Sciences, Vienna, Austria.
| |
Collapse
|
8
|
de Visser SP. Mechanistic Insight on the Activity and Substrate Selectivity of Nonheme Iron Dioxygenases. CHEM REC 2018; 18:1501-1516. [PMID: 29878456 DOI: 10.1002/tcr.201800033] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2018] [Accepted: 05/18/2018] [Indexed: 01/05/2023]
Abstract
Nonheme iron dioxygenases catalyze vital reactions for human health particularly related to aging processes. They are involved in the biosynthesis of amino acids, but also the biodegradation of toxic compounds. Typically they react with their substrate(s) through oxygen atom transfer, although often with the assistance of a co-substrate like α-ketoglutarate that is converted to succinate and CO2 . Many reaction processes catalyzed by the nonheme iron dioxygenases are stereoselective or regiospecific and hence understanding the mechanism and protein involvement in the selectivity is important for the design of biotechnological applications of these enzymes. To this end, I will review recent work of our group on nonheme iron dioxygenases and include background information on their general structure and catalytic cycle. Examples of stereoselective and regiospecific reaction mechanisms we elucidated are for the AlkB repair enzyme, prolyl-4-hydroxylase and the ergothioneine biosynthesis enzyme. Finally, I cover an example where we bioengineered S-p-hydroxymandelate synthase into the R-p-hydroxymandelate synthase.
Collapse
Affiliation(s)
- Sam P de Visser
- Manchester Institute of Biotechnology and School of Chemical Engineering and Analytical Science, The University of Manchester, 131 Princess Street, Manchester, M1 7DN, United Kingdom
| |
Collapse
|
9
|
Crystal structure of CO-bound cytochrome c oxidase determined by serial femtosecond X-ray crystallography at room temperature. Proc Natl Acad Sci U S A 2017; 114:8011-8016. [PMID: 28698372 DOI: 10.1073/pnas.1705628114] [Citation(s) in RCA: 45] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Cytochrome c oxidase (CcO), the terminal enzyme in the electron transfer chain, translocates protons across the inner mitochondrial membrane by harnessing the free energy generated by the reduction of oxygen to water. Several redox-coupled proton translocation mechanisms have been proposed, but they lack confirmation, in part from the absence of reliable structural information due to radiation damage artifacts caused by the intense synchrotron radiation. Here we report the room temperature, neutral pH (6.8), damage-free structure of bovine CcO (bCcO) in the carbon monoxide (CO)-bound state at a resolution of 2.3 Å, obtained by serial femtosecond X-ray crystallography (SFX) with an X-ray free electron laser. As a comparison, an equivalent structure was obtained at a resolution of 1.95 Å, from data collected at a synchrotron light source. In the SFX structure, the CO is coordinated to the heme a3 iron atom, with a bent Fe-C-O angle of ∼142°. In contrast, in the synchrotron structure, the Fe-CO bond is cleaved; CO relocates to a new site near CuB, which, in turn, moves closer to the heme a3 iron by ∼0.38 Å. Structural comparison reveals that ligand binding to the heme a3 iron in the SFX structure is associated with an allosteric structural transition, involving partial unwinding of the helix-X between heme a and a3, thereby establishing a communication linkage between the two heme groups, setting the stage for proton translocation during the ensuing redox chemistry.
Collapse
|
10
|
Kekilli D, Moreno-Chicano T, Chaplin AK, Horrell S, Dworkowski FSN, Worrall JAR, Strange RW, Hough MA. Photoreduction and validation of haem-ligand intermediate states in protein crystals by in situ single-crystal spectroscopy and diffraction. IUCRJ 2017; 4:263-270. [PMID: 28512573 PMCID: PMC5414400 DOI: 10.1107/s2052252517002159] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/16/2016] [Accepted: 02/09/2017] [Indexed: 05/24/2023]
Abstract
Powerful synergies are available from the combination of multiple methods to study proteins in the crystalline form. Spectroscopies which probe the same region of the crystal from which X-ray crystal structures are determined can give insights into redox, ligand and spin states to complement the information gained from the electron-density maps. The correct assignment of crystal structures to the correct protein redox and ligand states is essential to avoid the misinterpretation of structural data. This is a particular concern for haem proteins, which can occupy a wide range of redox states and are exquisitely sensitive to becoming reduced by solvated electrons generated from interactions of X-rays with water molecules in the crystal. Here, single-crystal spectroscopic fingerprinting has been applied to investigate the laser photoreduction of ferric haem in cytochrome c'. Furthermore, in situ X-ray-driven generation of haem intermediates in crystals of the dye-decolourizing-type peroxidase A (DtpA) from Streptomyces lividans is described.
Collapse
Affiliation(s)
- Demet Kekilli
- School of Biological Sciences, University of Essex, Wivenhoe Park, Colchester CO4 3SQ, England
| | - Tadeo Moreno-Chicano
- School of Biological Sciences, University of Essex, Wivenhoe Park, Colchester CO4 3SQ, England
| | - Amanda K. Chaplin
- School of Biological Sciences, University of Essex, Wivenhoe Park, Colchester CO4 3SQ, England
| | - Sam Horrell
- School of Biological Sciences, University of Essex, Wivenhoe Park, Colchester CO4 3SQ, England
| | | | - Jonathan A. R. Worrall
- School of Biological Sciences, University of Essex, Wivenhoe Park, Colchester CO4 3SQ, England
| | - Richard W. Strange
- School of Biological Sciences, University of Essex, Wivenhoe Park, Colchester CO4 3SQ, England
| | - Michael A. Hough
- School of Biological Sciences, University of Essex, Wivenhoe Park, Colchester CO4 3SQ, England
| |
Collapse
|
11
|
Li XX, Postils V, Sun W, Faponle AS, Solà M, Wang Y, Nam W, de Visser SP. Reactivity Patterns of (Protonated) Compound II and Compound I of Cytochrome P450: Which is the Better Oxidant? Chemistry 2017; 23:6406-6418. [PMID: 28295741 DOI: 10.1002/chem.201700363] [Citation(s) in RCA: 56] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2017] [Indexed: 01/27/2023]
Abstract
The cytochromes P450 are versatile enzymes in human physiology that perform substrate hydroxylation reactions extremely efficiently. In this work, we present results of a computational study on the reactivity patterns of Compound I, Compound II, and protonated Compound II with model substrates, and we address the question of which of these compounds is the most effective oxidant? All calculations, regardless of the substrate, implicated that Compound I is the superior oxidant of the three. However, Compound II and protonated Compound II were found to react with free energies of activation that are only a few kcal mol-1 higher in energy than those obtained with Compound I. Therefore, Compound II and protonated Compound II should be able to react with aliphatic groups with moderate C-H bond strengths. We have analysed all results in detail and have given electronic, thermochemical, valence bond, and molecular orbital rationalizations on the reactivity differences and explained experimental product distributions. Overall, the findings implied that alternative oxidants could operate alongside Compound I in complex reaction mechanisms of enzymatic and synthetic iron porphyrinoid complexes.
Collapse
Affiliation(s)
- Xiao-Xi Li
- State Key Laboratory for Oxo Synthesis and Selective Oxidation, Suzhou Research Institute of LICP, Lanzhou Institute of Chemical Physics (LICP), Chinese Academy of Sciences, Lanzhou, 730000, P. R. China
| | - Verònica Postils
- Institut de Química Computacional i Catàlisi (IQCC) and Department de Química, Universitat de Girona, Campus de Montilivi, C/ Maria Aurèlia Capmany 6, 17003, Girona, Catalonia, Spain.,The Manchester Institute of Biotechnology and School of Chemical Engineering and Analytical Science, The University of Manchester, 131 Princess Street, Manchester, M1 7DN, UK
| | - Wei Sun
- State Key Laboratory for Oxo Synthesis and Selective Oxidation, Suzhou Research Institute of LICP, Lanzhou Institute of Chemical Physics (LICP), Chinese Academy of Sciences, Lanzhou, 730000, P. R. China
| | - Abayomi S Faponle
- The Manchester Institute of Biotechnology and School of Chemical Engineering and Analytical Science, The University of Manchester, 131 Princess Street, Manchester, M1 7DN, UK
| | - Miquel Solà
- Institut de Química Computacional i Catàlisi (IQCC) and Department de Química, Universitat de Girona, Campus de Montilivi, C/ Maria Aurèlia Capmany 6, 17003, Girona, Catalonia, Spain
| | - Yong Wang
- State Key Laboratory for Oxo Synthesis and Selective Oxidation, Suzhou Research Institute of LICP, Lanzhou Institute of Chemical Physics (LICP), Chinese Academy of Sciences, Lanzhou, 730000, P. R. China
| | - Wonwoo Nam
- State Key Laboratory for Oxo Synthesis and Selective Oxidation, Suzhou Research Institute of LICP, Lanzhou Institute of Chemical Physics (LICP), Chinese Academy of Sciences, Lanzhou, 730000, P. R. China.,Department of Chemistry and Nano Science, Ewha Womans University, Seoul, 03760, Korea
| | - Sam P de Visser
- The Manchester Institute of Biotechnology and School of Chemical Engineering and Analytical Science, The University of Manchester, 131 Princess Street, Manchester, M1 7DN, UK
| |
Collapse
|
12
|
Chintapalli SV, Jayanthi S, Mallipeddi PL, Gundampati R, Suresh Kumar TK, van Rossum DB, Anishkin A, Adams SH. Novel Molecular Interactions of Acylcarnitines and Fatty Acids with Myoglobin. J Biol Chem 2016; 291:25133-25143. [PMID: 27758871 DOI: 10.1074/jbc.m116.754978] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2016] [Revised: 09/29/2016] [Indexed: 11/06/2022] Open
Abstract
Previous research has indicated that long-chain fatty acids can bind myoglobin (Mb) in an oxygen-dependent manner. This suggests that oxy-Mb may play an important role in fuel delivery in Mb-rich muscle fibers (e.g. type I fibers and cardiomyocytes), and raises the possibility that Mb also serves as an acylcarnitine-binding protein. We report for the first time the putative interaction and affinity characteristics for different chain lengths of both fatty acids and acylcarnitines with oxy-Mb using molecular dynamic simulations and isothermal titration calorimetry experiments. We found that short- to medium-chain fatty acids or acylcarnitines (ranging from C2:0 to C10:0) fail to achieve a stable conformation with oxy-Mb. Furthermore, our results indicate that C12:0 is the minimum chain length essential for stable binding of either fatty acids or acylcarnitines with oxy-Mb. Importantly, the empirical lipid binding studies were consistent with structural modeling. These results reveal that: (i) the lipid binding affinity for oxy-Mb increases as the chain length increases (i.e. C12:0 to C18:1), (ii) the binding affinities of acylcarnitines are higher when compared with their respective fatty acid counterparts, and (iii) both fatty acids and acylcarnitines bind to oxy-Mb in 1:1 stoichiometry. Taken together, our results support a model in which oxy-Mb is a novel regulator of long-chain acylcarnitine and fatty acid pools in Mb-rich tissues. This has important implications for physiological fuel management during exercise, and relevance to pathophysiological conditions (e.g. fatty acid oxidation disorders and cardiac ischemia) where long-chain acylcarnitine accumulation is evident.
Collapse
Affiliation(s)
- Sree V Chintapalli
- From the Arkansas Children's Nutrition Center and Department of Pediatrics, University of Arkansas for Medical Sciences, Little Rock, Arkansas 72202,
| | - Srinivas Jayanthi
- the Department of Chemistry and Biochemistry, University of Arkansas, Fayetteville, Arkansas 72701
| | - Prema L Mallipeddi
- the Department of Biology and Biochemistry, University of Houston, Houston, Texas 77204
| | - Ravikumar Gundampati
- the Department of Chemistry and Biochemistry, University of Arkansas, Fayetteville, Arkansas 72701
| | | | - Damian B van Rossum
- the Center for Computational Proteomics and.,the Department of Biology, The Pennsylvania State University, University Park, Pennsylvania 16802, and
| | - Andriy Anishkin
- the Department of Biology, University of Maryland, College Park, Maryland 20742
| | - Sean H Adams
- From the Arkansas Children's Nutrition Center and Department of Pediatrics, University of Arkansas for Medical Sciences, Little Rock, Arkansas 72202,
| |
Collapse
|
13
|
Tiwari MK, Mishra PC. Catalytic role of iron-superoxide dismutase in hydrogen abstraction by super oxide radical anion from ascorbic acid. RSC Adv 2016. [DOI: 10.1039/c6ra11455e] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
The catalytic role of iron-superoxide dismutase (Fe-SOD) in the working of ascorbic acid (AA) as a superoxide radical anion scavenger has been studied by employing a model developed recently for the active site of the enzyme.
Collapse
Affiliation(s)
- Manish K. Tiwari
- Department of Physics
- Institute of Science
- Banaras Hindu University
- Varanasi – 221 005
- India
| | - Phool C. Mishra
- Department of Physics
- Institute of Science
- Banaras Hindu University
- Varanasi – 221 005
- India
| |
Collapse
|
14
|
Ascenzi P, Sbardella D, Fiocchetti M, Santucci R, Coletta M. NO2−-mediated nitrosylation of ferrous microperoxidase-11. J Inorg Biochem 2015; 153:121-127. [DOI: 10.1016/j.jinorgbio.2015.06.022] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2015] [Revised: 06/03/2015] [Accepted: 06/30/2015] [Indexed: 11/29/2022]
|
15
|
Uporov IV, Forlemu NY, Nori R, Aleksandrov T, Sango BA, Mbote YEB, Pothuganti S, Thomasson KA. Introducing DInaMo: A Package for Calculating Protein Circular Dichroism Using Classical Electromagnetic Theory. Int J Mol Sci 2015; 16:21237-76. [PMID: 26370961 PMCID: PMC4613251 DOI: 10.3390/ijms160921237] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2015] [Revised: 06/09/2015] [Accepted: 06/30/2015] [Indexed: 01/23/2023] Open
Abstract
The dipole interaction model is a classical electromagnetic theory for calculating circular dichroism (CD) resulting from the π-π* transitions of amides. The theoretical model, pioneered by J. Applequist, is assembled into a package, DInaMo, written in Fortran allowing for treatment of proteins. DInaMo reads Protein Data Bank formatted files of structures generated by molecular mechanics or reconstructed secondary structures. Crystal structures cannot be used directly with DInaMo; they either need to be rebuilt with idealized bond angles and lengths, or they need to be energy minimized to adjust bond lengths and bond angles because it is common for crystal structure geometries to have slightly short bond lengths, and DInaMo is sensitive to this. DInaMo reduces all the amide chromophores to points with anisotropic polarizability and all nonchromophoric aliphatic atoms including hydrogens to points with isotropic polarizability; all other atoms are ignored. By determining the interactions among the chromophoric and nonchromophoric parts of the molecule using empirically derived polarizabilities, the rotational and dipole strengths are determined leading to the calculation of CD. Furthermore, ignoring hydrogens bound to methyl groups is initially explored and proves to be a good approximation. Theoretical calculations on 24 proteins agree with experiment showing bands with similar morphology and maxima.
Collapse
Affiliation(s)
- Igor V Uporov
- Chemistry Department, University of North Dakota, 151 Cornell St. Stop 9024, Grand Forks, ND 58202, USA.
- Faculty of Chemistry, M. V. Lomonosov Moscow State University, GSP-1, 1-3 Leninskiye Gory, 119991 Moscow, Russia.
| | - Neville Y Forlemu
- Chemistry Department, University of North Dakota, 151 Cornell St. Stop 9024, Grand Forks, ND 58202, USA.
- Georgia Gwinnett College, 1000 University Center Lane, Lawrenceville, GA 30043, USA.
| | - Rahul Nori
- Chemistry Department, University of North Dakota, 151 Cornell St. Stop 9024, Grand Forks, ND 58202, USA.
| | - Tsvetan Aleksandrov
- Chemistry Department, University of North Dakota, 151 Cornell St. Stop 9024, Grand Forks, ND 58202, USA.
| | - Boris A Sango
- Chemistry Department, University of North Dakota, 151 Cornell St. Stop 9024, Grand Forks, ND 58202, USA.
| | - Yvonne E Bongfen Mbote
- Chemistry Department, University of North Dakota, 151 Cornell St. Stop 9024, Grand Forks, ND 58202, USA.
- James E. Hurley College of Science & Mathematics, Oklahoma Baptist University, OBU Box 61772, 500 W. University, Shawnee, OK 74804, USA.
| | - Sandeep Pothuganti
- Chemistry Department, University of North Dakota, 151 Cornell St. Stop 9024, Grand Forks, ND 58202, USA.
| | - Kathryn A Thomasson
- Chemistry Department, University of North Dakota, 151 Cornell St. Stop 9024, Grand Forks, ND 58202, USA.
| |
Collapse
|
16
|
Chintapalli SV, Bhardwaj G, Patel R, Shah N, Patterson RL, van Rossum DB, Anishkin A, Adams SH. Molecular dynamic simulations reveal the structural determinants of Fatty Acid binding to oxy-myoglobin. PLoS One 2015; 10:e0128496. [PMID: 26030763 PMCID: PMC4451517 DOI: 10.1371/journal.pone.0128496] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2014] [Accepted: 04/27/2015] [Indexed: 11/18/2022] Open
Abstract
The mechanism(s) by which fatty acids are sequestered and transported in muscle have not been fully elucidated. A potential key player in this process is the protein myoglobin (Mb). Indeed, there is a catalogue of empirical evidence supporting direct interaction of globins with fatty acid metabolites; however, the binding pocket and regulation of the interaction remains to be established. In this study, we employed a computational strategy to elucidate the structural determinants of fatty acids (palmitic & oleic acid) binding to Mb. Sequence analysis and docking simulations with a horse (Equus caballus) structural Mb reference reveals a fatty acid-binding site in the hydrophobic cleft near the heme region in Mb. Both palmitic acid and oleic acid attain a "U" shaped structure similar to their conformation in pockets of other fatty acid-binding proteins. Specifically, we found that the carboxyl head group of palmitic acid coordinates with the amino group of Lys45, whereas the carboxyl group of oleic acid coordinates with both the amino groups of Lys45 and Lys63. The alkyl tails of both fatty acids are supported by surrounding hydrophobic residues Leu29, Leu32, Phe33, Phe43, Phe46, Val67, Val68 and Ile107. In the saturated palmitic acid, the hydrophobic tail moves freely and occasionally penetrates deeper inside the hydrophobic cleft, making additional contacts with Val28, Leu69, Leu72 and Ile111. Our simulations reveal a dynamic and stable binding pocket in which the oxygen molecule and heme group in Mb are required for additional hydrophobic interactions. Taken together, these findings support a mechanism in which Mb acts as a muscle transporter for fatty acid when it is in the oxygenated state and releases fatty acid when Mb converts to deoxygenated state.
Collapse
Affiliation(s)
- Sree V. Chintapalli
- Arkansas Children’s Nutrition Center, and Department of Pediatrics, University of Arkansas for Medical Sciences, Little Rock, Arkansas, United States of America
- * E-mail: (SVC); (SHA)
| | - Gaurav Bhardwaj
- Department of Biochemistry and Molecular Medicine, School of Medicine, University of California Davis, Davis, California, United States of America
| | - Reema Patel
- Department of Biochemistry and Molecular Medicine, School of Medicine, University of California Davis, Davis, California, United States of America
- Department of Physiology and Membrane Biology, School of Medicine, University of California Davis, Davis, California, United States of America
| | - Natasha Shah
- Department of Biochemistry and Molecular Medicine, School of Medicine, University of California Davis, Davis, California, United States of America
- Department of Physiology and Membrane Biology, School of Medicine, University of California Davis, Davis, California, United States of America
| | - Randen L. Patterson
- Department of Biochemistry and Molecular Medicine, School of Medicine, University of California Davis, Davis, California, United States of America
- Department of Physiology and Membrane Biology, School of Medicine, University of California Davis, Davis, California, United States of America
| | - Damian B. van Rossum
- Center for Computational Proteomics, The Pennsylvania State University, State College, Pennsylvania, United States of America
- Department of Biology, The Pennsylvania State University, State College, Pennsylvania, United States of America
| | - Andriy Anishkin
- Department of Biology, University of Maryland, College Park, Maryland, United States of America
| | - Sean H. Adams
- Arkansas Children’s Nutrition Center, and Department of Pediatrics, University of Arkansas for Medical Sciences, Little Rock, Arkansas, United States of America
- * E-mail: (SVC); (SHA)
| |
Collapse
|
17
|
Abstract
It was recently demonstrated that in ferric myoglobins (Mb) the fluorescence quenching of the photoexcited tryptophan 14 (*Trp(14)) residue is in part due to an electron transfer to the heme porphyrin (porph), turning it to the ferrous state. However, the invariance of *Trp decay times in ferric and ferrous Mbs raises the question as to whether electron transfer may also be operative in the latter. Using UV pump/visible probe transient absorption, we show that this is indeed the case for deoxy-Mb. We observe that the reduction generates (with a yield of about 30%) a low-valence Fe-porphyrin π [Fe(II)(porph(●-))] -anion radical, which we observe for the first time to our knowledge under physiological conditions. We suggest that the pathway for the electron transfer proceeds via the leucine 69 (Leu(69)) and valine 68 (Val(68)) residues. The results on ferric Mbs and the present ones highlight the generality of Trp-porphyrin electron transfer in heme proteins.
Collapse
|
18
|
Stadler AM, Koza MM, Fitter J. Determination of Conformational Entropy of Fully and Partially Folded Conformations of Holo- and Apomyoglobin. J Phys Chem B 2014; 119:72-82. [DOI: 10.1021/jp509732q] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Andreas M. Stadler
- Jülich
Centre for Neutron Science JCNS and Institute for Complex Systems
ICS, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany
| | | | - Jörg Fitter
- Institute
of Complex Systems (ICS-5): Molecular Biophysics, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany
- I.
Physikalisches Institut (IA), AG Biophysik, RWTH Aachen, Sommerfeldstrasse
14, 52074 Aachen, Germany
| |
Collapse
|
19
|
Shelby ML, Mara MW, Chen LX. New insight into metalloporphyrin excited state structures and axial ligand binding from X-ray transient absorption spectroscopic studies. Coord Chem Rev 2014. [DOI: 10.1016/j.ccr.2014.05.025] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
|
20
|
Hayashi T, Morita Y, Mizohata E, Oohora K, Ohbayashi J, Inoue T, Hisaeda Y. Co(ii)/Co(i) reduction-induced axial histidine-flipping in myoglobin reconstituted with a cobalt tetradehydrocorrin as a methionine synthase model. Chem Commun (Camb) 2014; 50:12560-3. [DOI: 10.1039/c4cc05448b] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
21
|
Jones EM, Monza E, Balakrishnan G, Blouin GC, Mak PJ, Zhu Q, Kincaid JR, Guallar V, Spiro TG. Differential control of heme reactivity in alpha and beta subunits of hemoglobin: a combined Raman spectroscopic and computational study. J Am Chem Soc 2014; 136:10325-39. [PMID: 24991732 PMCID: PMC4353013 DOI: 10.1021/ja503328a] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2014] [Indexed: 12/05/2022]
Abstract
The use of hybrid hemoglobin (Hb), with mesoheme substituted for protoheme, allows separate monitoring of the α or β hemes along the allosteric pathway. Using resonance Raman (rR) spectroscopy in silica gel, which greatly slows protein motions, we have observed that the Fe-histidine stretching frequency, νFeHis, which is a monitor of heme reactivity, evolves between frequencies characteristic of the R and T states, for both α or β chains, prior to the quaternary R-T and T-R shifts. Computation of νFeHis, using QM/MM and the conformational search program PELE, produced remarkable agreement with experiment. Analysis of the PELE structures showed that the νFeHis shifts resulted from heme distortion and, in the α chain, Fe-His bond tilting. These results support the tertiary two-state model of ligand binding (Henry et al., Biophys. Chem. 2002, 98, 149). Experimentally, the νFeHis evolution is faster for β than for α chains, and pump-probe rR spectroscopy in solution reveals an inflection in the νFeHis time course at 3 μs for β but not for α hemes, an interval previously shown to be the first step in the R-T transition. In the α chain νFeHis dropped sharply at 20 μs, the final step in the R-T transition. The time courses are fully consistent with recent computational mapping of the R-T transition via conjugate peak refinement by Karplus and co-workers (Fischer et al., Proc. Natl. Acad. Sci. U. S. A. 2011, 108, 5608). The effector molecule IHP was found to lower νFeHis selectively for α chains within the R state, and a binding site in the α1α2 cleft is suggested.
Collapse
Affiliation(s)
- Eric M. Jones
- Department
of Chemistry, University of Washington, Box 351700, Seattle, Washington 98195-1700, United States
| | - Emanuele Monza
- Joint
BSC-IRB Research Program in Computational Biology, Barcelona Supercomputing Center, c/Jordi Girona 29, 08034 Barcelona, Spain
| | - Gurusamy Balakrishnan
- Department
of Chemistry, University of Washington, Box 351700, Seattle, Washington 98195-1700, United States
| | - George C. Blouin
- Department
of Chemistry, University of Washington, Box 351700, Seattle, Washington 98195-1700, United States
| | - Piotr J. Mak
- Department
of Chemistry, Marquette University, Milwaukee, Wisconsin 53233, United States
| | - Qianhong Zhu
- Department
of Chemistry, Marquette University, Milwaukee, Wisconsin 53233, United States
| | - James R. Kincaid
- Department
of Chemistry, Marquette University, Milwaukee, Wisconsin 53233, United States
| | - Victor Guallar
- Joint
BSC-IRB Research Program in Computational Biology, Barcelona Supercomputing Center, c/Jordi Girona 29, 08034 Barcelona, Spain
- Institució
Catalana de Recerca i Estudis Avançats (ICREA), Passeig Lluís Companys 23, 08010 Barcelona, Spain
| | - Thomas G. Spiro
- Department
of Chemistry, University of Washington, Box 351700, Seattle, Washington 98195-1700, United States
| |
Collapse
|
22
|
Davydov R, Laryukhin M, Ledbetter-Rogers A, Sono M, Dawson JH, Hoffman BM. Electron paramagnetic resonance and electron-nuclear double resonance studies of the reactions of cryogenerated hydroperoxoferric-hemoprotein intermediates. Biochemistry 2014; 53:4894-903. [PMID: 25046203 PMCID: PMC4144713 DOI: 10.1021/bi500296d] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
![]()
The fleeting ferric peroxo and hydroperoxo
intermediates of dioxygen
activation by hemoproteins can be readily trapped and characterized
during cryoradiolytic reduction of ferrous hemoprotein–O2 complexes at 77 K. Previous cryoannealing studies suggested
that the relaxation of cryogenerated hydroperoxoferric intermediates
of myoglobin (Mb), hemoglobin, and horseradish peroxidase (HRP), either
trapped directly at 77 K or generated by cryoannealing of a trapped
peroxo-ferric state, proceeds through dissociation of bound H2O2 and formation of the ferric heme without formation
of the ferryl porphyrin π-cation radical intermediate, compound
I (Cpd I). Herein we have reinvestigated the mechanism of decays of
the cryogenerated hydroperoxyferric intermediates of α- and
β-chains of human hemoglobin, HRP, and chloroperoxidase (CPO).
The latter two proteins are well-known to form spectroscopically detectable
quasistable Cpds I. Peroxoferric intermediates are trapped during
77 K cryoreduction of oxy Mb, α-chains, and β-chains of
human hemoglobin and CPO. They convert into hydroperoxoferric intermediates
during annealing at temperatures above 160 K. The hydroperoxoferric
intermediate of HRP is trapped directly at 77 K. All studied hydroperoxoferric
intermediates decay with measurable rates at temperatures above 170
K with appreciable solvent kinetic isotope effects. The hydroperoxoferric
intermediate of β-chains converts to the S =
3/2 Cpd I, which in turn decays to an electron paramagnetic resonance
(EPR)-silent product at temperature above 220 K. For all the other
hemoproteins studied, cryoannealing of the hydroperoxo intermediate
directly yields an EPR-silent majority product. In each case, a second
follow-up 77 K γ-irradiation of the annealed samples yields
low-spin EPR signals characteristic of cryoreduced ferrylheme (compound
II, Cpd II). This indicates that in general the hydroperoxoferric
intermediates relax to Cpd I during cryoanealing at low temperatures,
but when this state is not captured by reaction with a bound substrate,
it is reduced to Cpd II by redox-active products of radiolysis.
Collapse
Affiliation(s)
- Roman Davydov
- Department of Chemistry, Northwestern University , 2145 Sheridan Road, Evanston, Illinois 60208-3113, United States
| | | | | | | | | | | |
Collapse
|
23
|
Sowole MA, Konermann L. Effects of Protein–Ligand Interactions on Hydrogen/Deuterium Exchange Kinetics: Canonical and Noncanonical Scenarios. Anal Chem 2014; 86:6715-22. [DOI: 10.1021/ac501849n] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
- Modupeola A. Sowole
- Department
of Chemistry, The University of Western Ontario, London, Ontario N6A 5B7, Canada
| | - Lars Konermann
- Department
of Chemistry, The University of Western Ontario, London, Ontario N6A 5B7, Canada
| |
Collapse
|
24
|
Yosca TH, Behan RK, Krest CM, Onderko EL, Langston MC, Green MT. Setting an upper limit on the myoglobin iron(IV)hydroxide pK(a): insight into axial ligand tuning in heme protein catalysis. J Am Chem Soc 2014; 136:9124-31. [PMID: 24875119 PMCID: PMC4091272 DOI: 10.1021/ja503588n] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
To provide insight into the iron(IV)hydroxide pK(a) of histidine ligated heme proteins, we have probed the active site of myoglobin compound II over the pH range of 3.9-9.5, using EXAFS, Mössbauer, and resonance Raman spectroscopies. We find no indication of ferryl protonation over this pH range, allowing us to set an upper limit of 2.7 on the iron(IV)hydroxide pK(a) in myoglobin. Together with the recent determination of an iron(IV)hydroxide pK(a) ∼ 12 in the thiolate-ligated heme enzyme cytochrome P450, this result provides insight into Nature's ability to tune catalytic function through its choice of axial ligand.
Collapse
Affiliation(s)
- Timothy H Yosca
- Department of Chemistry, Pennsylvania State University , University Park, State College, Pennsylvania 16802, United States
| | | | | | | | | | | |
Collapse
|
25
|
Choi J, Tojo S, Fujitsuka M, Majima T. Dynamics in the heme geometry of myoglobin induced by the one-electron reduction. Int J Radiat Biol 2014; 90:459-67. [DOI: 10.3109/09553002.2013.876115] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
|
26
|
Cerda JF, Malloy MC, Werkheiser BO, Stockhausen AT, Gallagher MF, Lawler AC. Evaluation of Heme Peripheral Group Interactions in Extremely Low-Dielectric Constant Media and Their Contributions to the Heme Reduction Potential. Inorg Chem 2013; 53:182-8. [DOI: 10.1021/ic401986n] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Jose F. Cerda
- Department of Chemistry, Saint Joseph’s University, Philadelphia, Pennsylvania 19131, United States
| | - Mary C. Malloy
- Department of Chemistry, Saint Joseph’s University, Philadelphia, Pennsylvania 19131, United States
| | - Brady O. Werkheiser
- Department of Chemistry, Saint Joseph’s University, Philadelphia, Pennsylvania 19131, United States
| | - Alaina T. Stockhausen
- Department of Chemistry, Saint Joseph’s University, Philadelphia, Pennsylvania 19131, United States
| | - Michael F. Gallagher
- Department of Chemistry, Saint Joseph’s University, Philadelphia, Pennsylvania 19131, United States
| | - Andrew C. Lawler
- Department of Chemistry, Saint Joseph’s University, Philadelphia, Pennsylvania 19131, United States
| |
Collapse
|
27
|
Harcourt RD. The McClure and Weiss models of Fe–O2 bonding for oxyhemes, and the HbO2 + NO reaction. J Biol Inorg Chem 2013; 19:113-23. [DOI: 10.1007/s00775-013-1066-5] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2013] [Accepted: 11/06/2013] [Indexed: 10/25/2022]
|
28
|
Abstract
![]()
Myoglobin
(Mb) binds diatomic ligands, like O2, CO,
and NO, in a cavity that is only transiently accessible. Crystallography
and molecular simulations show that the ligands can migrate through
an extensive network of transiently connected cavities but disagree
on the locations and occupancy of internal hydration sites. Here,
we use water 2H and 17O magnetic relaxation
dispersion (MRD) to characterize the internal water molecules in Mb
under physiological conditions. We find that equine carbonmonoxy Mb
contains 4.5 ± 1.0 ordered internal water molecules with a mean
survival time of 5.6 ± 0.5 μs at 25 °C. The likely
locations of these water molecules are the four polar hydration sites,
including one of the xenon-binding cavities, that are fully occupied
in all high-resolution crystal structures of equine Mb. The finding
that water escapes from these sites, located 17–31 Å apart
in the protein, on the same μs time scale suggests a global
exchange mechanism. We propose that this mechanism involves transient
penetration of the protein by H-bonded water chains. Such a mechanism
could play a functional role by eliminating trapped ligands. In addition,
the MRD results indicate that 2 or 3 of the 11 histidine residues
of equine Mb undergo intramolecular hydrogen exchange on a μs
time scale.
Collapse
Affiliation(s)
- Shuji Kaieda
- Department of Biophysical Chemistry, Lund University , P.O. Box 124, SE-22100 Lund, Sweden
| | | |
Collapse
|
29
|
Cirera J, Alvarez S. Stereospinomers of pentacoordinate iron porphyrin complexes: the case of the [Fe(porphyrinato)(CN)]− anions. Dalton Trans 2013; 42:7002-8. [DOI: 10.1039/c3dt50168j] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
30
|
Nakano S, Takahashi M, Sakamoto A, Morikawa H, Katayanagi K. The reductive reaction mechanism of tobacco nitrite reductase derived from a combination of crystal structures and ultraviolet-visible microspectroscopy. Proteins 2012; 80:2035-45. [PMID: 22499059 DOI: 10.1002/prot.24094] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2012] [Revised: 03/28/2012] [Accepted: 04/05/2012] [Indexed: 11/05/2022]
Abstract
Assimilatory nitrite reductase (aNiR) reduces nitrite to an ammonium ion and has siroheme and a [Fe(4)S(4)] cluster as prosthetic groups. A reaction mechanism for Nii3, an aNiR from tobacco, is proposed based on high resolution X-ray structures and UV-Vis (ultraviolet-visible) microspectroscopy of Nii3-ligand complexes. Analysis of UV-Vis spectral changes in Nii3 crystals with increasing X-ray exposure showed prosthetic group reductions. In Nii3-NO2(-) structures, X-ray irradiation enhanced the progress of the reduction reaction, and cleavage of the N-O bond was observed when X-ray doses were increased. Crystal structures of Nii3 with other bound ligands, such as Nii3-NO and Nii3-NH(2)OH, were also determined. Further, by combining information from these Nii3 ligand-bound structures, including that of Nii3-NO2(-), with UV-Vis microspectral data obtained using different X-ray doses, a reaction mechanism for aNiR was suggested. Cleavage of the two N-O bonds of nitrite was envisaged as a two-step process: first, the N-O bond close to Lys224 was cleaved, followed by cleavage of the N-O bond close to Arg109. X-ray structures also indicated that aNiR-catalyzed nitrite reduction proceeded without the need for conformation changes in active site residues. Geometrical changes in the ligand molecules and the placement of neighboring water molecules appeared to be important to the stability of the active site residue interactions (Arg109, Arg179, and Lys224) and the ligand molecule. These interactions may contribute to the efficiency of aNiR reduction reactions.
Collapse
Affiliation(s)
- Shogo Nakano
- Department of Mathematical and Life Sciences, Graduate School of Science, Hiroshima University, Higashi-Hiroshima, Japan
| | | | | | | | | |
Collapse
|
31
|
Stadler AM, Pellegrini E, Johnson M, Fitter J, Zaccai G. Dynamics-stability relationships in apo- and holomyoglobin: a combined neutron scattering and molecular dynamics simulations study. Biophys J 2012; 102:351-9. [PMID: 22339872 DOI: 10.1016/j.bpj.2011.12.031] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2011] [Revised: 10/20/2011] [Accepted: 12/21/2011] [Indexed: 11/15/2022] Open
Abstract
The removal of the heme group from myoglobin (Mb) results in a destabilization of the protein structure. The dynamic basis of the destabilization was followed by comparative measurements on holo- (holo-Mb) and apomyoglobin (apo-Mb). Mean-squared displacements (MSD) and protein resilience on the picosecond-to-nanosecond timescale were measured by elastic incoherent neutron scattering. Differences in thermodynamic parameters, MSD, and resilience were observed for both proteins. The resilience of holo-Mb was significantly lower than that of apo-Mb, indicating entropic stabilization by a higher degree of conformational sampling in the heme-bound folded protein. Molecular dynamics simulations provided site-specific information. Averaged over the whole structure, the molecular dynamics simulations yielded similar MSD and resilience values for the two proteins. The mobility of residues around the heme group in holo-Mb showed a smaller MSD and higher resilience compared to the same residue group in apo-Mb. It is of interest that in holo-Mb, higher MSD values are observed for the residues outside the heme pocket, indicating an entropic contribution to protein stabilization by heme binding, which is in agreement with experimental results.
Collapse
|
32
|
Tran DT, Banerjee S, Alayash AI, Crumbliss AL, Fitzgerald MC. Slow histidine H/D exchange protocol for thermodynamic analysis of protein folding and stability using mass spectrometry. Anal Chem 2012; 84:1653-60. [PMID: 22185579 DOI: 10.1021/ac202927p] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Described here is a mass spectrometry-based protocol to study the thermodynamic stability of proteins and protein-ligand complexes using the chemical denaturant dependence of the slow H/D exchange reaction of the imidazole C(2) proton in histidine side chains. The protocol is developed using several model protein systems including: ribonuclease (Rnase) A, myoglobin, bovine carbonic anhydrase (BCA) II, hemoglobin (Hb), and the hemoglobin-haptoglobin (Hb-Hp) protein complex. Folding free energies consistent with those previously determined by other more conventional techniques were obtained for the two-state folding proteins, Rnase A and myoglobin. The protocol successfully detected a previously observed partially unfolded intermediate stabilized in the BCA II folding/unfolding reaction, and it could be used to generate a K(d) value of 0.24 nM for the Hb-Hp complex. The compatibility of the protocol with conventional mass spectrometry-based proteomic sample preparation and analysis methods was also demonstrated in an experiment in which the protocol was used to detect the binding of zinc to superoxide dismutase in the yeast cell lysate sample. The yeast cell sample analyses also helped define the scope of the technique, which requires the presence of globally protected histidine residues in a protein's three-dimensional structure for successful application.
Collapse
Affiliation(s)
- Duc T Tran
- Department of Biochemistry, Duke University Medical Center, Durham, North Carolina 27708, USA
| | | | | | | | | |
Collapse
|
33
|
Mechanistic insight from thermal activation parameters for oxygenation reactions of different substrates with biomimetic iron porphyrin models for compounds I and II. J Biol Inorg Chem 2011; 17:27-36. [DOI: 10.1007/s00775-011-0822-7] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2011] [Accepted: 07/07/2011] [Indexed: 10/17/2022]
|
34
|
Orville AM, Buono R, Cowan M, Héroux A, Shea-McCarthy G, Schneider DK, Skinner JM, Skinner MJ, Stoner-Ma D, Sweet RM. Correlated single-crystal electronic absorption spectroscopy and X-ray crystallography at NSLS beamline X26-C. JOURNAL OF SYNCHROTRON RADIATION 2011; 18:358-66. [PMID: 21525643 PMCID: PMC3083912 DOI: 10.1107/s0909049511006315] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/29/2010] [Accepted: 02/19/2011] [Indexed: 05/05/2023]
Abstract
The research philosophy and new capabilities installed at NSLS beamline X26-C to support electronic absorption and Raman spectroscopies coupled with X-ray diffraction are reviewed. This beamline is dedicated full time to multidisciplinary studies with goals that include revealing the relationship between the electronic and atomic structures in macromolecules. The beamline instrumentation has been fully integrated such that optical absorption spectra and X-ray diffraction images are interlaced. Therefore, optical changes induced by X-ray exposure can be correlated with X-ray diffraction data collection. The installation of Raman spectroscopy into the beamline is also briefly reviewed. Data are now routinely generated almost simultaneously from three complementary types of experiments from the same sample. The beamline is available now to the NSLS general user population.
Collapse
Affiliation(s)
- Allen M Orville
- Biology Department, Brookhaven National Laboratory, Upton, NY 11973-5000, USA.
| | | | | | | | | | | | | | | | | | | |
Collapse
|
35
|
Afanasiev P, Kudrik EV, Millet JMM, Bouchu D, Sorokin AB. High-valent diiron species generated from N-bridged diiron phthalocyanine and H2O2. Dalton Trans 2011; 40:701-10. [DOI: 10.1039/c0dt00958j] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
36
|
Ronda L, Bruno S, Bettati S, Mozzarelli A. Protein crystal microspectrophotometry. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2010; 1814:734-41. [PMID: 21184848 DOI: 10.1016/j.bbapap.2010.12.008] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/08/2010] [Revised: 12/10/2010] [Accepted: 12/11/2010] [Indexed: 11/16/2022]
Abstract
Single crystal microspectrophotometry has emerged as a valuable technique for monitoring molecular events that take place within protein crystals, thus tightly coupling structure to function. Absorption and fluorescence spectra, ligand binding affinities and kinetic constants can be determined, allowing i) the definition of the experimental conditions for X-ray crystallography experiments and their interpretation, ii) the assessment of whether crystal lattice forces have altered conformational equilibria, iii) the comparison with data obtained in solution. Microspectrophotometric measurements using oriented crystals and linearly polarized light are carried out usually off-line with respect to X-ray data collection and are aimed at an in- depth characterization of protein function in the crystal, leading to robust structure-function relationships. The power of this approach is highlighted by reporting a few case studies, including hemoglobins, pyridoxal 5'-phosphate-dependent enzymes and acetylcholinesterases. This article is part of a Special Issue entitled: Protein Structure and Function in the Crystalline State.
Collapse
Affiliation(s)
- Luca Ronda
- Department of Biochemistry and Molecular Biology, University of Parma, Parma, Italy
| | | | | | | |
Collapse
|
37
|
Hersleth HP, Andersson KK. How different oxidation states of crystalline myoglobin are influenced by X-rays. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2010; 1814:785-96. [PMID: 20691815 DOI: 10.1016/j.bbapap.2010.07.019] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/20/2010] [Revised: 07/14/2010] [Accepted: 07/20/2010] [Indexed: 10/19/2022]
Abstract
X-ray induced radiation damage of protein crystals is well known to occur even at cryogenic temperatures. Redox active sites like metal sites seem especially vulnerable for these radiation-induced reductions. It is essential to know correctly the oxidation state of metal sites in protein crystal structures to be able to interpret the structure-function relation. Through previous structural studies, we have tried to characterise and understand the reactions between myoglobin and peroxides. These reaction intermediates are relevant because myoglobin is proposed to take part as scavenger of reactive oxygen species during oxidative stress, and because these intermediates are similar among the haem peroxidases and oxygenases. We have in our previous studies shown that these different myoglobin states are influenced by the X-rays used. In this study, we have in detail investigated the impact that X-rays have on these different oxidation states of myoglobin. An underlying goal has been to find a way to be able to determine mostly unreduced states. We have by using single-crystal light absorption spectroscopy found that the different oxidation states of myoglobin are to a different extent influenced by the X-rays (e.g. ferric Fe(III) myoglobin is faster reduced than ferryl Fe(IV)═O myoglobin). We observe that the higher oxidation states are not reduced to normal ferrous Fe(II) or ferric Fe(III) states, but end up in some intermediate and possibly artificial states. For ferric myoglobin, it seems that annealing of the radiation-induced/reduced state can reversibly more or less give the starting point (ferric myoglobin). Both scavengers and different dose-rates might influence to which extent the different states are affected by the X-rays. Our study shows that it is essential to do a time/dose monitoring of the influence X-rays have on each specific redox-state with spectroscopic techniques like single-crystal light absorption spectroscopy. This will determine to which extent you can collect X-ray diffraction data on your crystal before it becomes too heavily influenced/reduced by X-rays. This article is part of a Special Issue entitled: Protein Structure and Function in the Crystalline State.
Collapse
Affiliation(s)
- Hans-Petter Hersleth
- Department of Molecular Biosciences, University of Oslo, P.O. Box 1041 Blindern, NO-0316 Oslo, Norway.
| | | |
Collapse
|
38
|
Dong XY, Meng Y, Feng XD, Sun Y. A metal-chelate affinity reverse micellar system for protein extraction. Biotechnol Prog 2010; 26:150-8. [PMID: 19830821 DOI: 10.1002/btpr.291] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
A new nonionic reverse micellar system is developed by blending two nonionic surfactants, Triton X-45 and Span 80. At total surfactant concentrations lower than 60 mmol/L and molar fractions of Triton X-45 less than 0.6, thermodynamically stable reverse micelles of water content (W(0)) up to 30 are formed. Di(2-ethylhexyl) phosphoric acid (HDEHP; 1-2 mmol/L) is introduced into the system for chelating transition metal ions that have binding affinity for histidine-rich proteins. HDEHP exists in a dimeric form in organic solvents and a dimer associated with one transition metal ion, including copper, zinc, and nickel. The copper-chelate reverse micelles (Cu-RM) are characterized for their W(0), hydrodynamic radius (R(h)), and aggregation number (N(ag)). Similar with reverse micelles of bis-2-ethylhexyl sodium sulfosuccinate (AOT), R(h) of the Cu-RM is also linearly related to W(0). However, N(ag) is determined to be 30-90 at W(0) of 5-30, only quarter to half of the AOT reverse micelles. Then, selective metal-chelate extraction of histidine-rich protein (myoglobin) by the Cu-RM is successfully performed with pure and mixed protein systems (myoglobin and lysozyme). The solubilized protein can be recovered by stripping with imidazole or ethylinediaminetetraacetic acid (EDTA) solution. Because various transition metal ions can be chelated to the reverse micelles, it is convinced that the system would be useful for application in protein purification as well as simultaneous isolation and refolding of recombinant histidine-tagged proteins expressed as inclusion bodies.
Collapse
Affiliation(s)
- Xiao-Yan Dong
- Dept. of Biochemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
| | | | | | | |
Collapse
|
39
|
Zoppellaro G, Bren KL, Ensign AA, Harbitz E, Kaur R, Hersleth HP, Ryde U, Hederstedt L, Andersson KK. Review: studies of ferric heme proteins with highly anisotropic/highly axial low spin (S = 1/2) electron paramagnetic resonance signals with bis-histidine and histidine-methionine axial iron coordination. Biopolymers 2009; 91:1064-82. [PMID: 19536822 PMCID: PMC2852197 DOI: 10.1002/bip.21267] [Citation(s) in RCA: 65] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Six-coordinated heme groups are involved in a large variety of electron transfer reactions because of their ability to exist in both the ferrous (Fe(2+)) and ferric (Fe(3+)) state without any large differences in structure. Our studies on hemes coordinated by two histidines (bis-His) and hemes coordinated by histidine and methionine (His-Met) will be reviewed. In both of these coordination environments, the heme core can exhibit ferric low spin (electron paramagnetic resonance EPR) signals with large g(max) values (also called Type I, highly anisotropic low spin, or highly axial low spin, HALS species) as well as rhombic EPR (Type II) signals. In bis-His coordinated hemes rhombic and HALS envelopes are related to the orientation of the His groups with respect to each other such that (i) parallel His planes results in a rhombic signal and (ii) perpendicular His planes results in a HALS signal. Correlation between the structure of the heme and its ligands for heme with His-Met axial ligation and ligand-field parameters, as derived from a large series of cytochrome c variants, show, however, that for such a combination of axial ligands there is no clear-cut difference between the large g(max) and the "small g-anisotropy" cases as a result of the relative Met-His arrangements. Nonetheless, a new linear correlation links the average shift delta of the heme methyl groups with the g(max) values.
Collapse
Affiliation(s)
- Giorgio Zoppellaro
- Department of Molecular Biosciences, University of Oslo, PO Box 1041 Blindern, Oslo NO–0316, Norway
| | - Kara L. Bren
- Department of Chemistry, University of Rochester, Rochester, New York 146270216, USA
| | - Amy A. Ensign
- Department of Chemistry, University of Rochester, Rochester, New York 146270216, USA
| | - Espen Harbitz
- Department of Molecular Biosciences, University of Oslo, PO Box 1041 Blindern, Oslo NO–0316, Norway
| | - Ravinder Kaur
- Department of Chemistry, University of Rochester, Rochester, New York 146270216, USA
| | - Hans-Petter Hersleth
- Department of Molecular Biosciences, University of Oslo, PO Box 1041 Blindern, Oslo NO–0316, Norway
| | - Ulf Ryde
- Department Theoretical Chemistry, Lund University, Chemical Centre, P. O. Box 124, SE–221 00 Lund, Sweden
| | - Lars Hederstedt
- Department of Cell & Organism Biology, Lund University, Sölvegatan 35, SE–22362 Lund, Sweden
| | - K. Kristoffer Andersson
- Department of Molecular Biosciences, University of Oslo, PO Box 1041 Blindern, Oslo NO–0316, Norway
| |
Collapse
|
40
|
Hersleth HP, Hsiao YW, Ryde U, Görbitz CH, Andersson KK. The influence of X-rays on the structural studies of peroxide-derived myoglobin intermediates. Chem Biodivers 2008; 5:2067-2089. [PMID: 18972498 DOI: 10.1002/cbdv.200890189] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
In recent years, the awareness of potential radiation damage of metal centers in protein crystals during crystallographic data collection has received increasing attention. The radiation damage can lead to radiation-induced changes and reduction of the metal sites. One of the research fields where these concerns have been comprehensively addressed is the study of the reaction intermediates of the heme peroxidase and oxygenase reaction cycles. For both the resting states and the high-valent intermediates, the X-rays used in the structure determination have given undesired side effects through radiation-induced changes to the trapped intermediates. However, X-rays have been used to generate and trap the peroxy/hydroperoxy state in crystals. In this review, the structural work and the influence of X-rays on these intermediates in myoglobin are summarized and viewed in light of analogous studies on similar intermediates in peroxidases and oxygenases.
Collapse
Affiliation(s)
- Hans-Petter Hersleth
- University of Oslo, Department of Molecular Biosciences, P. O. Box 1041 Blindern, N-0316 Oslo
| | | | | | | | | |
Collapse
|
41
|
Alfonso-Prieto M, Vidossich P, Rodríguez-Fortea A, Carpena X, Fita I, Loewen PC, Rovira C. Electronic State of the Molecular Oxygen Released by Catalase. J Phys Chem A 2008; 112:12842-8. [DOI: 10.1021/jp801512h] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Mercedes Alfonso-Prieto
- Laboratori de Simulació Computacional i Modelització (CoSMoLab), Parc Científic de Barcelona, Baldiri Reixac 10-12, 08028 Barcelona, Spain, Institut de Química Teòrica i Computacional de la Universitat de Barcelona (IQTCUB), Departament de Química Física i Inorgànica, Universitat Rovira i Virgili, Marcel.lí Domingo s/n, 43007 Tarragona, Spain, Institut de Biologia Molecular (IBMB-CSIC), Institut de Recerca Biomèdica (IRB), Parc Científic de Barcelona, Josep Samitier 1-5, 08028 Barcelona, Spain,Department
| | - Pietro Vidossich
- Laboratori de Simulació Computacional i Modelització (CoSMoLab), Parc Científic de Barcelona, Baldiri Reixac 10-12, 08028 Barcelona, Spain, Institut de Química Teòrica i Computacional de la Universitat de Barcelona (IQTCUB), Departament de Química Física i Inorgànica, Universitat Rovira i Virgili, Marcel.lí Domingo s/n, 43007 Tarragona, Spain, Institut de Biologia Molecular (IBMB-CSIC), Institut de Recerca Biomèdica (IRB), Parc Científic de Barcelona, Josep Samitier 1-5, 08028 Barcelona, Spain,Department
| | - Antonio Rodríguez-Fortea
- Laboratori de Simulació Computacional i Modelització (CoSMoLab), Parc Científic de Barcelona, Baldiri Reixac 10-12, 08028 Barcelona, Spain, Institut de Química Teòrica i Computacional de la Universitat de Barcelona (IQTCUB), Departament de Química Física i Inorgànica, Universitat Rovira i Virgili, Marcel.lí Domingo s/n, 43007 Tarragona, Spain, Institut de Biologia Molecular (IBMB-CSIC), Institut de Recerca Biomèdica (IRB), Parc Científic de Barcelona, Josep Samitier 1-5, 08028 Barcelona, Spain,Department
| | - Xavi Carpena
- Laboratori de Simulació Computacional i Modelització (CoSMoLab), Parc Científic de Barcelona, Baldiri Reixac 10-12, 08028 Barcelona, Spain, Institut de Química Teòrica i Computacional de la Universitat de Barcelona (IQTCUB), Departament de Química Física i Inorgànica, Universitat Rovira i Virgili, Marcel.lí Domingo s/n, 43007 Tarragona, Spain, Institut de Biologia Molecular (IBMB-CSIC), Institut de Recerca Biomèdica (IRB), Parc Científic de Barcelona, Josep Samitier 1-5, 08028 Barcelona, Spain,Department
| | - Ignacio Fita
- Laboratori de Simulació Computacional i Modelització (CoSMoLab), Parc Científic de Barcelona, Baldiri Reixac 10-12, 08028 Barcelona, Spain, Institut de Química Teòrica i Computacional de la Universitat de Barcelona (IQTCUB), Departament de Química Física i Inorgànica, Universitat Rovira i Virgili, Marcel.lí Domingo s/n, 43007 Tarragona, Spain, Institut de Biologia Molecular (IBMB-CSIC), Institut de Recerca Biomèdica (IRB), Parc Científic de Barcelona, Josep Samitier 1-5, 08028 Barcelona, Spain,Department
| | - Peter C. Loewen
- Laboratori de Simulació Computacional i Modelització (CoSMoLab), Parc Científic de Barcelona, Baldiri Reixac 10-12, 08028 Barcelona, Spain, Institut de Química Teòrica i Computacional de la Universitat de Barcelona (IQTCUB), Departament de Química Física i Inorgànica, Universitat Rovira i Virgili, Marcel.lí Domingo s/n, 43007 Tarragona, Spain, Institut de Biologia Molecular (IBMB-CSIC), Institut de Recerca Biomèdica (IRB), Parc Científic de Barcelona, Josep Samitier 1-5, 08028 Barcelona, Spain,Department
| | - Carme Rovira
- Laboratori de Simulació Computacional i Modelització (CoSMoLab), Parc Científic de Barcelona, Baldiri Reixac 10-12, 08028 Barcelona, Spain, Institut de Química Teòrica i Computacional de la Universitat de Barcelona (IQTCUB), Departament de Química Física i Inorgànica, Universitat Rovira i Virgili, Marcel.lí Domingo s/n, 43007 Tarragona, Spain, Institut de Biologia Molecular (IBMB-CSIC), Institut de Recerca Biomèdica (IRB), Parc Científic de Barcelona, Josep Samitier 1-5, 08028 Barcelona, Spain,Department
| |
Collapse
|
42
|
The crystal structure of peroxymyoglobin generated through cryoradiolytic reduction of myoglobin compound III during data collection. Biochem J 2008; 412:257-64. [DOI: 10.1042/bj20070921] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2007] [Revised: 01/22/2008] [Accepted: 01/23/2008] [Indexed: 11/17/2022]
Abstract
Myoglobin has the ability to react with hydrogen peroxide, generating high-valent complexes similar to peroxidases (compounds I and II), and in the presence of excess hydrogen peroxide a third intermediate, compound III, with an oxymyoglobin-type structure is generated from compound II. The compound III is, however, easily one-electron reduced to peroxymyoglobin by synchrotron radiation during crystallographic data collection. We have generated and solved the 1.30 Å (1 Å=0.1 nm) resolution crystal structure of the peroxymyoglobin intermediate, which is isoelectric to compound 0 and has a Fe–O distance of 1.8 Å and O–O bond of 1.3 Å in accordance with a FeII–O–O− (or FeIII–O–O2−) structure. The generation of the peroxy intermediate through reduction of compound III by X-rays shows the importance of using single-crystal microspectrophotometry when doing crystallography on metalloproteins. After having collected crystallographic data on a peroxy-generated myoglobin crystal, we were able (by a short annealing) to break the O–O bond leading to formation of compound II. These results indicate that the cryoradiolytic-generated peroxymyoglobin is biologically relevant through its conversion into compound II upon heating. Additionally, we have observed that the Xe1 site is occupied by a water molecule, which might be the leaving group in the compound II to compound III reaction.
Collapse
|
43
|
Davydov R, Osborne RL, Kim SH, Dawson JH, Hoffman BM. EPR and ENDOR studies of cryoreduced compounds II of peroxidases and myoglobin. Proton-coupled electron transfer and protonation status of ferryl hemes. Biochemistry 2008; 47:5147-55. [PMID: 18407661 DOI: 10.1021/bi702514d] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The nature of the [Fe(IV)-O] center in hemoprotein Compounds II has recently received considerable attention, as several experimental and theoretical investigations have suggested that this group is not necessarily the traditionally assumed ferryl ion, [Fe(IV)=O]2+, but can be the protonated ferryl, [Fe(IV)-OH]3+. We show here that cryoreduction of the EPR-silent Compound II by gamma-irradiation at 77 K produces Fe(III) species retaining the structure of the precursor [Fe(IV)=O]2+ or [Fe(IV)-OH]3+, and that the properties of the cryogenerated species provide a report on structural features and the protonation state of the parent Compound II when studied by EPR and 1H and 14N ENDOR spectroscopies. To give the broadest view of the properties of Compounds II we have carried out such measurements on cryoreduced Compounds II of HRP, Mb, DHP and CPO and on CCP Compound ES. EPR and ENDOR spectra of cryoreduced HRP II, CPO II and CCP ES are characteristic of low-spin hydroxy-Fe(III) heme species. In contrast, cryoreduced "globins", Mb II, Hb II, and DHP II, show EPR spectra having lower rhombicity. In addition the cryogenerated ferric "globin" species display strongly coupled exchangeable (1)H ENDOR signals, with A max approximately 20 MHz and a iso approximately 14 MHz, both substantially greater than for hydroxide/water ligand protons. Upon annealing at T > 180 K the cryoreduced globin compounds II relax to the low-spin hydroxy-ferric form with a solvent kinetic isotope effect, KIE > 6. The results presented here together with published resonance Raman and Mossbauer data suggest that the high-valent iron center of globin and HRP compounds II, as well as of CCP ES, is [Fe(IV)=O]2+, and that its cryoreduction produces [Fe(III)-O]+. Instead, as proposed by Green and co-workers, CPO II contains [Fe(IV)-OH]3+ which forms [Fe(III)-OH]2+ upon radiolysis. The [Fe(III)-O]+ generated by cryoreduction of HRP II and CCP ES protonate at 77 K, presumably because the heme is linked to a distal-pocket hydrogen bonding/proton-delivery network through an H-bond to the "oxide" ligand. The data also indicate that Mb and HRP compounds II exist as two major conformational substates.
Collapse
Affiliation(s)
- Roman Davydov
- Department of Chemistry, Northwestern University, 2145 Sheridan Road, Tech K148, Evanston, Illinois 60208-3113, USA
| | | | | | | | | |
Collapse
|
44
|
Badyal SK, Metcalfe CL, Basran J, Efimov I, Moody PCE, Raven EL. Iron Oxidation State Modulates Active Site Structure in a Heme Peroxidase,. Biochemistry 2008; 47:4403-9. [DOI: 10.1021/bi702337n] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Sandip K. Badyal
- Department of Chemistry, Henry Wellcome Building, University of Leicester, University Road, Leicester LE1 7RH, England, U.K., and Department of Biochemistry and Henry Wellcome Laboratories for Structural Biology, Henry Wellcome Building, University of Leicester, Lancaster Road, Leicester LE1 9HN, England, U.K
| | - Clive L. Metcalfe
- Department of Chemistry, Henry Wellcome Building, University of Leicester, University Road, Leicester LE1 7RH, England, U.K., and Department of Biochemistry and Henry Wellcome Laboratories for Structural Biology, Henry Wellcome Building, University of Leicester, Lancaster Road, Leicester LE1 9HN, England, U.K
| | - Jaswir Basran
- Department of Chemistry, Henry Wellcome Building, University of Leicester, University Road, Leicester LE1 7RH, England, U.K., and Department of Biochemistry and Henry Wellcome Laboratories for Structural Biology, Henry Wellcome Building, University of Leicester, Lancaster Road, Leicester LE1 9HN, England, U.K
| | - Igor Efimov
- Department of Chemistry, Henry Wellcome Building, University of Leicester, University Road, Leicester LE1 7RH, England, U.K., and Department of Biochemistry and Henry Wellcome Laboratories for Structural Biology, Henry Wellcome Building, University of Leicester, Lancaster Road, Leicester LE1 9HN, England, U.K
| | - Peter C. E. Moody
- Department of Chemistry, Henry Wellcome Building, University of Leicester, University Road, Leicester LE1 7RH, England, U.K., and Department of Biochemistry and Henry Wellcome Laboratories for Structural Biology, Henry Wellcome Building, University of Leicester, Lancaster Road, Leicester LE1 9HN, England, U.K
| | - Emma Lloyd Raven
- Department of Chemistry, Henry Wellcome Building, University of Leicester, University Road, Leicester LE1 7RH, England, U.K., and Department of Biochemistry and Henry Wellcome Laboratories for Structural Biology, Henry Wellcome Building, University of Leicester, Lancaster Road, Leicester LE1 9HN, England, U.K
| |
Collapse
|
45
|
Hersleth HP, Varnier A, Harbitz E, Røhr ÅK, Schmidt PP, Sørlie M, Cederkvist FH, Marchal S, Gorren AC, Mayer B, Uchida T, Schünemann V, Kitagawa T, Trautwein AX, Shimizu T, Lange R, Görbitz CH, Andersson KK. Reactive complexes in myoglobin and nitric oxide synthase. Inorganica Chim Acta 2008. [DOI: 10.1016/j.ica.2007.09.045] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
|
46
|
Zeng W, Barabanschikov A, Zhang Y, Zhao J, Sturhahn W, Alp EE, Sage JT. Synchrotron-Derived Vibrational Data Confirm Unprotonated Oxo Ligand in Myoglobin Compound II. J Am Chem Soc 2008; 130:1816-7. [DOI: 10.1021/ja077823+] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|