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Title: Reversible inhibition and reactivation of electron transfer in photosystem I

Abstract

In photosystem I (PSI) complexes at room temperature light induced electron transfer can proceed down multiple protein-cofactor branches, and the process can be an order of magnitude faster on one branch compared to the other. One factor that might contribute to this branch asymmetry is a tryptophan amino acid at position 673 on the psaB protein. This amino acid is located between two of the pigments involved in electron transfer on the psaB protein branch. The corresponding residue on the psaA protein branch is a glycine amino acid. Microsecond time-resolved step-scan FTIR difference spectroscopy at 77 K has been used to study isolated PSI complexes from wild type and a mutant where the tryptophan residue was changed to phenylalanine. Photoaccumulated FTIR difference spectra indicate changes in the protein structure upon mutation. In the mutant we also find that the electron transfer processes is inhibited following long periods of repetitive flash illumination at room temperature. This is due to double protonation of the pigment involved in electron transfer. However, we show that we can restore electron transfer functionality by incubating the light-treated mutant PSI samples in the presence of newly added (not protonated) pigment.

Authors:
 [1];  [1];  [2]; ORCiD logo [2]; ORCiD logo [1]
  1. Georgia State Univ., Atlanta, GA (United States)
  2. Univ. of Louisville at Lafayette, LA (United States)
Publication Date:
Research Org.:
Georgia State Univ., Atlanta, GA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Contributing Org.:
Georgia State University University of Louisiana At Lafayette
OSTI Identifier:
1774547
Grant/Contract Number:  
SC0017937
Resource Type:
Accepted Manuscript
Journal Name:
Photosynthesis Research
Additional Journal Information:
Journal Volume: 145; Journal Issue: 2; Journal ID: ISSN 0166-8595
Publisher:
Springer
Country of Publication:
United States
Language:
English
Subject:
59 BASIC BIOLOGICAL SCIENCES; Photosynthesis; Photosystem I; Time-resolved step-scan FTIR difference spectroscopy; Site directed mutant

Citation Formats

Agarwala, Neva, Makita, Hiroki, Luo, Lujun, Xu, Wu, and Hastings, Gary. Reversible inhibition and reactivation of electron transfer in photosystem I. United States: N. p., 2020. Web. doi:10.1007/s11120-020-00760-9.
Agarwala, Neva, Makita, Hiroki, Luo, Lujun, Xu, Wu, & Hastings, Gary. Reversible inhibition and reactivation of electron transfer in photosystem I. United States. https://doi.org/10.1007/s11120-020-00760-9
Agarwala, Neva, Makita, Hiroki, Luo, Lujun, Xu, Wu, and Hastings, Gary. Sat . "Reversible inhibition and reactivation of electron transfer in photosystem I". United States. https://doi.org/10.1007/s11120-020-00760-9. https://www.osti.gov/servlets/purl/1774547.
@article{osti_1774547,
title = {Reversible inhibition and reactivation of electron transfer in photosystem I},
author = {Agarwala, Neva and Makita, Hiroki and Luo, Lujun and Xu, Wu and Hastings, Gary},
abstractNote = {In photosystem I (PSI) complexes at room temperature light induced electron transfer can proceed down multiple protein-cofactor branches, and the process can be an order of magnitude faster on one branch compared to the other. One factor that might contribute to this branch asymmetry is a tryptophan amino acid at position 673 on the psaB protein. This amino acid is located between two of the pigments involved in electron transfer on the psaB protein branch. The corresponding residue on the psaA protein branch is a glycine amino acid. Microsecond time-resolved step-scan FTIR difference spectroscopy at 77 K has been used to study isolated PSI complexes from wild type and a mutant where the tryptophan residue was changed to phenylalanine. Photoaccumulated FTIR difference spectra indicate changes in the protein structure upon mutation. In the mutant we also find that the electron transfer processes is inhibited following long periods of repetitive flash illumination at room temperature. This is due to double protonation of the pigment involved in electron transfer. However, we show that we can restore electron transfer functionality by incubating the light-treated mutant PSI samples in the presence of newly added (not protonated) pigment.},
doi = {10.1007/s11120-020-00760-9},
journal = {Photosynthesis Research},
number = 2,
volume = 145,
place = {United States},
year = {Sat May 23 00:00:00 EDT 2020},
month = {Sat May 23 00:00:00 EDT 2020}
}

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