The circadian rhythm regulator RpaA modulates photosynthetic electron transport and alters the preferable temperature range for growth in a cyanobacterium

Hazuki Hasegawa, Tatsuhiro Tsurumaki, Sousuke Imamura, Kintake Sonoike, Kan Tanaka

Research output: Contribution to journalArticlepeer-review

Abstract

Cyanobacterial strains can grow within a specific temperature range that approximately corresponds to their natural habitat. However, how the preferable temperature range for growth (PTRG) is determined at the molecular level remains unclear. In this study, we detected a PTRG upshift in a mutant strain of Synechococcus elongatus PCC 7942 lacking the circadian rhythm regulator RpaA. Subsequent analyses revealed that RpaA decreases the electron transport from photosystem I to NADPH. The change in electron transport likely inhibits H2O2 generation under high-temperature conditions and contributes to the observed PTRG upshift in rpaA-deficient cells. The importance of the effects of the circadian rhythm regulator on the PTRG is discussed.

Original languageEnglish
Pages (from-to)1480-1492
Number of pages13
JournalFEBS Letters
Volume595
Issue number10
DOIs
Publication statusPublished - 2021 May

Keywords

  • RpaA
  • circadian clock
  • cyanobacteria
  • photosynthesis
  • preferable temperature range for growth

ASJC Scopus subject areas

  • Biophysics
  • Structural Biology
  • Biochemistry
  • Molecular Biology
  • Genetics
  • Cell Biology

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