The secondary electron acceptor of photosystem I in Gloeobacter violaceus PCC 7421 is menaquinone-4 that is synthesized by a unique but unknown pathway

Mamoru Mimuro, Tohru Tsuchiya, Hidetoshi Inoue, Yumiko Sakuragi, Yuka Itoh, Takanori Gotoh, Hideaki Miyashita, Donald A. Bryant, Masami Kobayashi

Research output: Contribution to journalArticle

18 Scopus citations

Abstract

The secondary electron acceptor of photosystem (PS) I in the cyanobacterium Gloeobacter violaceus PCC 7421 was identified as menaquinone-4 (MQ-4) by comparing high performance liquid chromatograms and absorption spectra with an authentic compound. The MQ-4 content was estimated to be two molecules per one molecule of chlorophyll (Chl) a′, a constituent of P700. Comparative genomic analyses showed that six of eight men genes, encoding phylloquinone/MQ biosynthetic enzymes, are missing from the G. violaceus genome. Since G. violaceus clearly synthesizes MQ-4, the combined results indicate that this cyanobacterium must have a novel pathway for the synthesis of 1,4-dihydroxy-2-naphthoic acid.

Original languageEnglish (US)
Pages (from-to)3493-3496
Number of pages4
JournalFEBS Letters
Volume579
Issue number17
DOIs
StatePublished - Jul 27 2005

All Science Journal Classification (ASJC) codes

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

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