The nature of the photosystem II reaction centre in the chlorophyll d-containing prokaryote, Acaryochloris marina

Min Chen, Alison Telfer, Su Lin, Andrew Pascal, Anthony W D Larkum, James Barber, Robert E. Blankenship

Research output: Contribution to journalArticlepeer-review

54 Scopus citations

Abstract

Pigment–protein complexes enriched in photosystem II (PS II) have been isolated from the chlorophyll (Chl) d containing cyanobacterium, Acaryochloris marina. A small PS II-enriched particle, we call ‘crude reaction centre’, contained 20 Chl d, 0.5 Chl a and 1 redox active cytochrome b-559 per 2 pheophytin a, plus the D1 and D2 proteins. A larger PS II-enriched particle, we call ‘core’, additionally bound the antenna complexes, CP47 and CP43, and had a higher chlorophyll per pheophytin ratio. Pheophytin a could be photoreduced in the presence of a strong reductant, indicating that it is the primary electron acceptor in photosystem II of A. marina. A substoichiometric amount of Chl a (less than one chlorophyll a per 2 pheophytin a) strongly suggests that Chl a does not have an essential role in the photochemistry of PS II in this organism. We conclude that PS II, in A. marina, utilizes Chl d and not Chl a as primary electron donor and that the primary electron acceptor is one of two molecules of pheophytin a.

Original languageEnglish (US)
Pages (from-to)1060-1064
Number of pages5
JournalPhotochemical and Photobiological Sciences
Volume4
Issue number12
DOIs
StatePublished - Nov 23 2005

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

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