Triazine herbicide resistance in the photosynthetic bacterium Rhodopseudomonas sphaeroides

A. E. Brown, C. W. Gilbert, R. Guy, C. J. Arntzen

Research output: Contribution to journalArticlepeer-review

23 Scopus citations


The photoaffinity herbicide azidoatrazine (2-azido-4-ethylamino-6-isopropylamino-s-triazine) selectively labels the L subunit of the reaction center of the photosynthetic bacterium Rhodopseudomonas sphaeroides. Herbicide-resistant mutants retain the L subunit and have altered binding properties for methylthio- and chloro-substituted triazines as well as altered equilibrium constants for electron transfer between primary and secondary electron acceptors. We suggest that a subtle alteration in the L subunit is responsible for herbicide resistance and that the L subunit is the functional analog of the 32-kDa Q(B) protein of chloroplast membranes.

Original languageEnglish (US)
Pages (from-to)6310-6314
Number of pages5
JournalProceedings of the National Academy of Sciences of the United States of America
Issue number20 I
StatePublished - 1984
Externally publishedYes

ASJC Scopus subject areas

  • General


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