P-700 photooxidation in state 1 and state 2 in cyanobacteria upon flash illumination with phycobilin- and chlorophyll-absorbed light

Nicholas Tsinoremas, Julia A M Hubbard, Michael C W Evans, John F. Allen

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

We have measured the flash yield of P-700 photooxidation in cells of the cyanobacteria Synechococcus 6301 and Nostoc MAC adapted to light-states 1 and 2. Using excitation at 337 nm, the flash yield of P-700 photooxidation at limiting flash intensity was larger in state 2 in both species, indicating an increased absorption cross-section of PS I in state 2 for light absorbed by both chlorophyll and phycobilin pigments. Using excitation at 532 nm, the flash yield of P-700 photooxidation at limiting intensity was also larger in state 2 in both species, indicating an increased absorption cross-section of PS I for light absorbed specifically by phycocyanin or phycoerythrin. Differences in P-700 re-reduction kinetics between states 1 and 2 were consistently observed following flash excitation at either wavelength. Our results are consistent with a model for redistribution of excitation energy in state 2 that involves decoupling of the phycobilisome from PS II and its functional reassociation with PS I. Photosynthesis; Light harvesting; Photosystem I; State transition; Phycobilisome; Excitation energy distribution; Cyanobacteria; (Nostoc MAC; Synechococcus 6301).

Original languageEnglish
Pages (from-to)106-110
Number of pages5
JournalFEBS Letters
Volume256
Issue number1-2
DOIs
StatePublished - Oct 9 1989
Externally publishedYes

Fingerprint

Phycobilins
Photooxidation
Cyanobacteria
Chlorophyll
Lighting
Phycobilisomes
Nostoc
Synechococcus
Light
Excitation energy
Phycocyanin
Phycoerythrin
Photosystem I Protein Complex
Photosynthesis
Electron transitions
Pigments
Wavelength
Kinetics
chlorophyll P 700

ASJC Scopus subject areas

  • Biochemistry
  • Biophysics
  • Molecular Biology

Cite this

P-700 photooxidation in state 1 and state 2 in cyanobacteria upon flash illumination with phycobilin- and chlorophyll-absorbed light. / Tsinoremas, Nicholas; Hubbard, Julia A M; Evans, Michael C W; Allen, John F.

In: FEBS Letters, Vol. 256, No. 1-2, 09.10.1989, p. 106-110.

Research output: Contribution to journalArticle

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