Identification of two homologous genes, chlAI and chlAII, that are differentially involved in isocyclic ring formation of chlorophyll a in the cyanobacterium Synechocystis sp. PCC 6803.

@article{Minamizaki2008IdentificationOT,
  title={Identification of two homologous genes, chlAI and chlAII, that are differentially involved in isocyclic ring formation of chlorophyll a in the cyanobacterium Synechocystis sp. PCC 6803.},
  author={Kei Minamizaki and Tadashi Mizoguchi and Takeaki Goto and Hitoshi Tamiaki and Yuichi Fujita},
  journal={The Journal of biological chemistry},
  year={2008},
  volume={283 5},
  pages={2684-92}
}
The isocyclic ring (E-ring) is a common structural feature of chlorophylls. The E-ring is formed by two structurally unrelated Mg-protoporphyrin IX monomethylester (MPE) cyclase systems, oxygen-dependent (AcsF), and oxygen-independent (BchE) systems, which involve incorporation of an oxygen atom from molecular oxygen and water into the C-13(1) position of MPE, respectively. Which system operates in cyanobacteria that can thrive in a variety of anaerobic environments remains an open question… CONTINUE READING

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