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Phosphoprotein SAK1 is a regulator of acclimation to singlet oxygen in Chlamydomonas reinhardtii

Journal Article · · eLife
DOI:https://doi.org/10.7554/elife.02286· OSTI ID:1628809
 [1];  [2];  [2];  [3];  [4];  [5];  [6];  [7]
  1. Univ. of California, Berkeley, CA (United States). Dept. of Plant and Microbial Biology; DOE/OSTI
  2. Univ. of California, Berkeley, CA (United States). Dept. of Plant and Microbial Biology
  3. Department of Plant and Microbial Biology, University of California, Berkeley, Berkeley, United States
  4. Univ. of California, Los Angeles, CA (United States). Dept. of Molecular, Cell and Developmental Biology
  5. Univ. of California, Los Angeles, CA (United States). Dept. of Molecular, Cell and Developmental Biology; Univ. of California, Los Angeles, CA (United States). Inst. for Genomics and Proteomics
  6. Univ. of California, Los Angeles, CA (United States). Inst. for Genomics and Proteomics; Univ. of California, Los Angeles, CA (United States). Dept. of Chemistry and Biochemistry
  7. Univ. of California, Berkeley, CA (United States). Dept. of Plant and Microbial Biology; Univ. of California, Berkeley, CA (United States). Howard Hughes Medical Inst.; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Physical Biosciences Division

Singlet oxygen is a highly toxic and inevitable byproduct of oxygenic photosynthesis. The unicellular green alga Chlamydomonas reinhardtii is capable of acclimating specifically to singlet oxygen stress, but the retrograde signaling pathway from the chloroplast to the nucleus mediating this response is unknown. Here we describe a mutant, singlet oxygen acclimation knocked-out 1 (sak1), that lacks the acclimation response to singlet oxygen. Analysis of genome-wide changes in RNA abundance during acclimation to singlet oxygen revealed that SAK1 is a key regulator of the gene expression response during acclimation. The SAK1 gene encodes an uncharacterized protein with a domain conserved among chlorophytes and present in some bZIP transcription factors. The SAK1 protein is located in the cytosol, and it is induced and phosphorylated upon exposure to singlet oxygen, suggesting that it is a critical intermediate component of the retrograde signal transduction pathway leading to singlet oxygen acclimation.

Research Organization:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER). Biological Systems Science Division; Gordon and Betty Moore Foundation; National Institutes of Health (NIH)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1628809
Journal Information:
eLife, Journal Name: eLife Vol. 3; ISSN 2050-084X
Publisher:
eLife Sciences Publications, Ltd.Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (6)

Regulation of photoprotection gene expression in Chlamydomonas by a putative E3 ubiquitin ligase complex and a homolog of CONSTANS journal August 2019
Characterization of Ferredoxin-Dependent Biliverdin Reductase PCYA1 Reveals the Dual Function in Retrograde Bilin Biosynthesis and Interaction With Light-Dependent Protochlorophyllide Oxidoreductase LPOR in Chlamydomonas reinhardtii journal May 2018
Data from: Phosphoprotein SAK1 is a regulator of acclimation to singlet oxygen in Chlamydomonas reinhardtii dataset January 2015
Large-scale insertional mutagenesis of Chlamydomonas supports phylogenomic functional prediction of photosynthetic genes and analysis of classical acetate-requiring mutants journal April 2015
Light stress and photoprotection in Chlamydomonas reinhardtii journal March 2015
When Unity Is Strength: The Strategies Used by Chlamydomonas to Survive Environmental Stresses journal October 2019


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