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Title: Binding Mechanisms of Electron Transport Proteins with Cyanobacterial Photosystem I: An Integrated Computational and Experimental Model

Abstract

The stromal domain (PsaC, D, and E) of photosystem I (PSI) in cyanobacteria accepts electrons from PsaA and PsaB of photosystem I (PSI). These electrons are then used in the reduction of transiently bound ferredoxin (Fd) or flavodoxin. Experimental X-ray and NMR structures are known for all of these protein partners separately, yet to date, there is no known experimental structure of the PSI/Fd complexes in the published literature. Computational models of Fd docked with the stromal domain of cyanobacterial PSI were assembled here starting from X-ray and NMR structures of PSI and Fd. Predicted models of specific regions of protein–protein interactions were built on the basis of energetic frustration, residue conservation and evolutionary importance, as well as from experimental site-directed mutagenesis and cross-linking studies. Microsecond time-scale molecular dynamics simulations of the PSI/Fd complexes suggest, rather than a single complex structure, the possible existence of multiple transient complexes of Fd bound to PSI.

Authors:
ORCiD logo [1];  [2];  [2];  [3]; ORCiD logo [1]
  1. Department of Biochemistry and Cellular and Molecular Biology, University of Tennessee, Knoxville, Tennessee 37996, United States; UT/ORNL Center for Molecular Biophysics, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
  2. Department of Chemistry, Tennessee Technological University, Box 5055, Cookeville, Tennessee 38505-0001, United States
  3. Department of Biochemistry and Cellular and Molecular Biology, University of Tennessee, Knoxville, Tennessee 37996, United States
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory-National Energy Research Scientific Computing Center
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1480296
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Physical Chemistry. B, Condensed Matter, Materials, Surfaces, Interfaces and Biophysical Chemistry
Additional Journal Information:
Journal Volume: 122; Journal Issue: 3; Journal ID: ISSN 1520-6106
Country of Publication:
United States
Language:
English

Citation Formats

Kapoor, Karan, Cashman, Derek J., Nientimp, Luke, Bruce, Barry D., and Baudry, Jerome. Binding Mechanisms of Electron Transport Proteins with Cyanobacterial Photosystem I: An Integrated Computational and Experimental Model. United States: N. p., 2018. Web. doi:10.1021/acs.jpcb.7b08307.
Kapoor, Karan, Cashman, Derek J., Nientimp, Luke, Bruce, Barry D., & Baudry, Jerome. Binding Mechanisms of Electron Transport Proteins with Cyanobacterial Photosystem I: An Integrated Computational and Experimental Model. United States. doi:10.1021/acs.jpcb.7b08307.
Kapoor, Karan, Cashman, Derek J., Nientimp, Luke, Bruce, Barry D., and Baudry, Jerome. Fri . "Binding Mechanisms of Electron Transport Proteins with Cyanobacterial Photosystem I: An Integrated Computational and Experimental Model". United States. doi:10.1021/acs.jpcb.7b08307. https://www.osti.gov/servlets/purl/1480296.
@article{osti_1480296,
title = {Binding Mechanisms of Electron Transport Proteins with Cyanobacterial Photosystem I: An Integrated Computational and Experimental Model},
author = {Kapoor, Karan and Cashman, Derek J. and Nientimp, Luke and Bruce, Barry D. and Baudry, Jerome},
abstractNote = {The stromal domain (PsaC, D, and E) of photosystem I (PSI) in cyanobacteria accepts electrons from PsaA and PsaB of photosystem I (PSI). These electrons are then used in the reduction of transiently bound ferredoxin (Fd) or flavodoxin. Experimental X-ray and NMR structures are known for all of these protein partners separately, yet to date, there is no known experimental structure of the PSI/Fd complexes in the published literature. Computational models of Fd docked with the stromal domain of cyanobacterial PSI were assembled here starting from X-ray and NMR structures of PSI and Fd. Predicted models of specific regions of protein–protein interactions were built on the basis of energetic frustration, residue conservation and evolutionary importance, as well as from experimental site-directed mutagenesis and cross-linking studies. Microsecond time-scale molecular dynamics simulations of the PSI/Fd complexes suggest, rather than a single complex structure, the possible existence of multiple transient complexes of Fd bound to PSI.},
doi = {10.1021/acs.jpcb.7b08307},
journal = {Journal of Physical Chemistry. B, Condensed Matter, Materials, Surfaces, Interfaces and Biophysical Chemistry},
number = 3,
volume = 122,
place = {United States},
year = {2018},
month = {1}
}

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