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Lysine acetylation regulates the function of the global anaerobic transcription factor FnrL in R hodobacter sphaeroides
Author(s) -
Wei Wei,
Liu Tong,
Li Xinfeng,
Wang Ruofan,
Zhao Wei,
Zhao Guoping,
Zhao Shimin,
Zhou Zhihua
Publication year - 2017
Publication title -
molecular microbiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.857
H-Index - 247
eISSN - 1365-2958
pISSN - 0950-382X
DOI - 10.1111/mmi.13627
Subject(s) - biology , lysine , acetylation , transcription factor , function (biology) , biochemistry , transcription (linguistics) , anaerobic exercise , microbiology and biotechnology , genetics , gene , amino acid , linguistics , philosophy , physiology
Summary The metabolism of the purple non‐sulfur bacterium Rhodobacter sphaeroides is versatile and it can grow under various conditions. Here, we report evidence that the anaerobic photosynthetic metabolism of R. sphaeroides is regulated by protein lysine acetylation. Using a proteomic approach, 59 acetylated peptides were detected. Among them is the global anaerobic transcription factor FnrL, which regulates the biosynthetic pathway of tetrapyrroles and synthesis of the photosynthetic apparatus. Lysine 223 of FnrL was identified as acetylated. We show that all three lysines in the DNA binding domain (K223, K213 and K175) of FnrL can be acetylated by acetyl‐phosphate in vitro . A bacterial deacetylase homolog, RsCobB can deacetylate FnrL in vitro . The transcription of genes downstream of FnrL decreased when the DNA binding domain of FnrL was acetylated, as revealed by chromatin immunoprecipitation and acetylation‐mimicking mutagenesis. An increasing number of acetylated lysines resulted in a further decrease in DNA binding ability. These results demonstrate that the lysine acetylation can fine tune the function of the oxygen‐sensitive FnrL; thus, it might regulate anaerobic photosynthetic metabolism of R. sphaeroides .