ESR study of the primary electron donor in highly 13C-enriched Chlorobium limicola f. thiosulfatophilum

Michael R Wasielewski, Ursula H. Smith, James R. Norris

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Abstract

The photo-induced electron spin resonance signal of the primary donor P840+ in unit membrane fractions of the title photosynthetic bacterium was measured. Bacteria containing natural isotopic abundances and 82% 13C-enrichment were examined. Second moment analysis of the lineshape of the 13C-enriched P840+ signal shows that P840+ consists of two bacteriochlorophyll a-type macrocycles. The data thus obtained are independent of difficulties in interpreting either peak-to-peak linewidths or ENDOR data with respect to intermolecular spin delocalization.

Original languageEnglish
Pages (from-to)138-140
Number of pages3
JournalFEBS Letters
Volume149
Issue number1
DOIs
Publication statusPublished - Nov 22 1982

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Keywords

  • Bacteriochlorophyll
  • Carbon 13 enrichment
  • Chlorobium limicola
  • ESR
  • Reaction center

ASJC Scopus subject areas

  • Biochemistry
  • Biophysics
  • Molecular Biology

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