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

In this study, we detected a PTRG upshift in a mutant strain ofSynechococcus  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 inrpaA‐deficient cells. The importance of the effects of the circadian rhythm regulator on the PTRG is discussed.

Source: FEBS Letters - March 31, 2021 Category: Biochemistry Authors: Hazuki Hasegawa, Tatsuhiro Tsurumaki, Sousuke Imamura, Kintake Sonoike, Kan Tanaka, Peter Brzezinski Tags: Research Letter Source Type: research