Trimeric forms of the photosystem I reaction center complex pre-exist in the membranes of the cyanobacterium Spirulina platensis

V. V. Shubin, V. L. Tsuprun, I. N. Bezsmertnaya, N. V. Karapetyan

Research output: Contribution to journalArticlepeer-review

63 Scopus citations

Abstract

Oligomeric and monomeric forms of chlorophyll-protein complexes of photosystem I (PSI) have been isolated from the mesophilic cyanobacterium Spirulina [(1992) FEBS Lett. 309, 340-342]. Electron microscopic analysis of the complexes showed that the oligomeric form is a trimer of the shape and dimensions similar to those of the trimer from thermophilic cyanobacteria. The chlorophyl ratio in the isolated trimer and monomer was found to be 7:3. The trimeric form of PSI complex in contrast to the monomeric one contains the chlorophyll emitting at 760 nm (77K), which is also found in Spirulina membranes and therefore could be used as an intrinsic probe for the trimeric complex. The 77K circular dichroism spectrum of the trimeric form is much more similar to that of Spirulina membranes than the spectrum of the monomer. Thus, the trimeric PSI complexes exist and dominate in the Spirulina membranes.

Original languageEnglish (US)
Pages (from-to)79-82
Number of pages4
JournalFEBS Letters
Volume334
Issue number1
DOIs
StatePublished - Nov 8 1993

Bibliographical note

Copyright:
Copyright 2014 Elsevier B.V., All rights reserved.

Keywords

  • Chlorophyll
  • Circular dichroism
  • Cyanobacteria
  • Electron microscopy
  • Pigment-protein complex of photosystem I
  • Trimer

Fingerprint

Dive into the research topics of 'Trimeric forms of the photosystem I reaction center complex pre-exist in the membranes of the cyanobacterium Spirulina platensis'. Together they form a unique fingerprint.

Cite this