The Photosystem I-like P840-reaction center of Green S-bacteria is a homodimer

Michael Büttner, Dian Lin Xie, Hannah Nelson, Wilfried Pinther, Günter Hauska*, Nathan Nelson

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

47 Scopus citations


An operon encoding the P840 reaction center ofChlorobium limicola f.sp.thiosulfatophilum has been cloned and sequenced. It contains two structural genes coding for proteins of 730 and 232 amino acids. The first protein resembles the large subunits of the Photosystem I (PS I) reaction center. Putative binding elements for the primary donor, P840 inChlorobium and P700 in PS I and for the acceptors A0, A1 and FeS-center X are conserved. The second protein is related to the PS I subunit carrying the FeS-centers A and B. Since all our efforts to find a gene for a second, large subunit failed, the P840 reaction center probably is homodimeric.

Original languageEnglish
Pages (from-to)154-156
Number of pages3
JournalBiochimica et Biophysica Acta - Bioenergetics
Issue number2
StatePublished - 1992
Externally publishedYes


  • C. limicola f.sp.thiosulfatophilum
  • DNA sequence
  • Photosynthesis
  • Reaction center


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