Very high frequency (135 GHz) EPR of the oxidized primary donor of the photosynthetic bacteria Rb. Sphaeroides R-26 and Rps. Viridis and of Y.D (signal II) of plant photosystem II

V. I. Gulin, S. A. Dikanov, Yu D. Tsvetkov, R. G. Evelo, A. J. Hoff

Research output: Contribution to journalArticlepeer-review

Abstract

2 mm EPR spectroscopy reveals significant differences between the g-tensors of the oxidized primary donor in reaction centers of the photosynthetic bacteria Rb. sphaeroides R-26 and Rps. viridis: the principal values are gxx= 2.00159, gyy= 2.00224 and gzz= 2.00402, and gxx = 2.00180, gyy = 2.00235 and gxx= 2.00380, respectively. Similarly, the g-tensors of the tyrosyl YD radical in the D2subunit of the reaction center of plant photosystem II and of oxidized tyrosine in vitro are found to be quite different, with principal values of gxx= 2.00212, gyy= 2.00426 and gzz = 2.00752, and gxx= 2.00181, g = 2.00381 and gzz= 2.00613, respectively. The observed differences probably reflect differences in the molecular structure of the radicals investigated.

Original languageEnglish (US)
Pages (from-to)903-906
Number of pages4
JournalPure and Applied Chemistry
Volume64
Issue number6
DOIs
StatePublished - Jan 1992
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

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