1
|
Chen X, Chen M, Wolynes PG, Wittung-Stafshede P, Gray HB. Frustration Dynamics and Electron-Transfer Reorganization Energies in Wild-Type and Mutant Azurins. J Am Chem Soc 2022; 144:4178-4185. [PMID: 35171591 PMCID: PMC8915257 DOI: 10.1021/jacs.1c13454] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
![]()
Long-range electron
tunneling through metalloproteins is facilitated
by evolutionary tuning of donor–acceptor electronic couplings,
formal electrochemical potentials, and active-site reorganization
energies. Although the minimal frustration of the folding landscape
enables this tuning, residual frustration in the vicinity of the metallocofactor
can allow conformational fluctuations required for protein function.
We show here that the constrained copper site in wild-type azurin
is governed by an intricate pattern of minimally frustrated local
and distant interactions that together enable rapid electron flow
to and from the protein. In contrast, sluggish electron transfer reactions
(unfavorable reorganization energies) of active-site azurin variants
are attributable to increased frustration near to as well as distant
from the copper site, along with an exaggerated oxidation-state dependence
of both minimally and highly frustrated interaction patterns.
Collapse
Affiliation(s)
- Xun Chen
- Center for Theoretical Biological Physics, Houston, Texas 77005, United States.,Department of Chemistry, Rice University, Houston, Texas 77005, United States
| | - Mingchen Chen
- Center for Theoretical Biological Physics, Houston, Texas 77005, United States
| | - Peter G Wolynes
- Center for Theoretical Biological Physics, Houston, Texas 77005, United States.,Department of Chemistry, Rice University, Houston, Texas 77005, United States.,Department of Biosciences, Rice University, Houston, Texas 77005, United States
| | - Pernilla Wittung-Stafshede
- Department of Biology and Biological Engineering, Chalmers University of Technology, 412 96 Gothenburg, Sweden
| | - Harry B Gray
- Beckman Institute and Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, United States
| |
Collapse
|
2
|
Stan RC, Kros A, Akkilic N, Sanghamitra NJ, Appel J. Direct wiring of the azurin redox center to gold electrodes investigated by protein film voltammetry. J Electroanal Chem (Lausanne) 2017. [DOI: 10.1016/j.jelechem.2017.01.039] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
3
|
Yu Y, Petrik ID, Chacón KN, Hosseinzadeh P, Chen H, Blackburn NJ, Lu Y. Effect of circular permutation on the structure and function of type 1 blue copper center in azurin. Protein Sci 2017; 26:218-226. [PMID: 27759897 PMCID: PMC5275729 DOI: 10.1002/pro.3071] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2016] [Revised: 10/13/2016] [Accepted: 10/14/2016] [Indexed: 11/10/2022]
Abstract
Type 1 copper (T1Cu) proteins are electron transfer (ET) proteins involved in many important biological processes. While the effects of changing primary and secondary coordination spheres in the T1Cu ET function have been extensively studied, few report has explored the effect of the overall protein structural perturbation on active site configuration or reduction potential of the protein, even though the protein scaffold has been proposed to play a critical role in enforcing the entatic or "rack-induced" state for ET functions. We herein report circular permutation of azurin by linking the N- and C-termini and creating new termini in the loops between 1st and 2nd β strands or between 3rd and 4th β strands. Characterization by electronic absorption, electron paramagnetic spectroscopies, as well as crystallography and cyclic voltammetry revealed that, while the overall structure and the primary coordination sphere of the circular permutated azurins remain the same as those of native azurin, their reduction potentials increased by 18 and 124 mV over that of WTAz. Such increases in reduction potentials can be attributed to subtle differences in the hydrogen-bonding network in secondary coordination sphere around the T1Cu center.
Collapse
Affiliation(s)
- Yang Yu
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of SciencesTianjin300308China
| | - Igor D. Petrik
- Department of Chemistry, University of Illinois at Urbana‐ChampaignUrbanaIllinois61801
| | | | - Parisa Hosseinzadeh
- Department of BiochemistryUniversity of Illinois at Urbana‐ChampaignUrbanaIllinois61801
| | - Honghui Chen
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of SciencesTianjin300308China
- Tianjin University of Science and TechnologyTianjin300457China
| | - Ninian J. Blackburn
- Institute of Environmental Health, Oregon Health and Science UniversityPortlandOregon97239
| | - Yi Lu
- Department of Chemistry, University of Illinois at Urbana‐ChampaignUrbanaIllinois61801
- Department of BiochemistryUniversity of Illinois at Urbana‐ChampaignUrbanaIllinois61801
| |
Collapse
|
4
|
Liu J, Chakraborty S, Hosseinzadeh P, Yu Y, Tian S, Petrik I, Bhagi A, Lu Y. Metalloproteins containing cytochrome, iron-sulfur, or copper redox centers. Chem Rev 2014; 114:4366-469. [PMID: 24758379 PMCID: PMC4002152 DOI: 10.1021/cr400479b] [Citation(s) in RCA: 549] [Impact Index Per Article: 54.9] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2013] [Indexed: 02/07/2023]
Affiliation(s)
- Jing Liu
- Department of Chemistry, Department of Biochemistry, and Center for Biophysics
and Computational
Biology, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
| | - Saumen Chakraborty
- Department of Chemistry, Department of Biochemistry, and Center for Biophysics
and Computational
Biology, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
| | - Parisa Hosseinzadeh
- Department of Chemistry, Department of Biochemistry, and Center for Biophysics
and Computational
Biology, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
| | - Yang Yu
- Department of Chemistry, Department of Biochemistry, and Center for Biophysics
and Computational
Biology, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
| | - Shiliang Tian
- Department of Chemistry, Department of Biochemistry, and Center for Biophysics
and Computational
Biology, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
| | - Igor Petrik
- Department of Chemistry, Department of Biochemistry, and Center for Biophysics
and Computational
Biology, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
| | - Ambika Bhagi
- Department of Chemistry, Department of Biochemistry, and Center for Biophysics
and Computational
Biology, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
| | - Yi Lu
- Department of Chemistry, Department of Biochemistry, and Center for Biophysics
and Computational
Biology, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
| |
Collapse
|
5
|
Warren JJ, Lancaster KM, Richards JH, Gray HB. Inner- and outer-sphere metal coordination in blue copper proteins. J Inorg Biochem 2012; 115:119-26. [PMID: 22658756 PMCID: PMC3434318 DOI: 10.1016/j.jinorgbio.2012.05.002] [Citation(s) in RCA: 69] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2012] [Revised: 04/30/2012] [Accepted: 05/01/2012] [Indexed: 10/28/2022]
Abstract
Blue copper proteins (BCPs) comprise classic cases of Nature's profound control over the electronic structures and chemical reactivity of transition metal ions. Early studies of BCPs focused on their inner coordination spheres, that is, residues that directly coordinate Cu. Equally important are the electronic and geometric perturbations to these ligands provided by the outer coordination sphere. In this tribute to Hans Freeman, we review investigations that have advanced the understanding of how inner-sphere and outer-sphere coordination affects biological Cu properties.
Collapse
Affiliation(s)
- Jeffrey J Warren
- Beckman Institute, California Institute of Technology, Pasadena, CA 91125, USA
| | | | | | | |
Collapse
|