MarR-type transcriptional regulator ChlR activates expression of tetrapyrrole biosynthesis genes in response to low-oxygen conditions in cyanobacteria.

@article{Aoki2012MarRtypeTR,
  title={MarR-type transcriptional regulator ChlR activates expression of tetrapyrrole biosynthesis genes in response to low-oxygen conditions in cyanobacteria.},
  author={Rina Aoki and Tomoya Takeda and Tatsuo Omata and Kunio Ihara and Yuichi Fujita},
  journal={The Journal of biological chemistry},
  year={2012},
  volume={287 16},
  pages={13500-7}
}
Oxygen is required for three enzyme reactions in chlorophyll and bilin biosynthesis pathways: coproporphyrinogen III oxidase (HemF), heme oxygenase (HO1), and Mg-protoporphyrin IX monomethylester cyclase (ChlA(I)). The cyanobacterium Synechocystis sp. PCC 6803 has alternative enzymes, HemN, HO2, and ChlA(II), to supply chlorophyll/bilins even under low-oxygen environments. The three genes form an operon, chlA(II)-ho2-hemN, that is induced in response to low-oxygen conditions to bypass the… CONTINUE READING

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