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Partial uncoupling of energy transfer from phycoerythrin in the marine cyanobacteriumSynechococcussp. WH7803

Authors
Journal
Biochimica et Biophysica Acta (BBA) - Bioenergetics
0005-2728
Publisher
Elsevier
Publication Date
Volume
1099
Issue
3
Identifiers
DOI: 10.1016/0005-2728(92)90037-3
Keywords
  • Energy Transfer
  • Phycoerythrin
  • Biliprotein
  • Photosynthesis
  • Light Harvesting
  • Nitrogen Storage
  • (Cyanobacterium)
Disciplines
  • Biology

Abstract

Abstract Time-resolved fluorescence spectroscopy of the marine cyanobacterium Synechococcus sp WH7803 showed that a significant fraction of the biliprotein phycoerythrin did not transfer its excitation energy to the photosynthetic reaction centres when the organism had been cultured in non-limiting light conditions and with excess nitrogen supplied as nitrate. We consider that this partial decoupling of energy transfer shows the capacity that this organism has to use a portion of the phycocrythrin as a nitrogen reserve, without the corresponding photo-oxidative damage that could occur from having a larger functional antenna than is required by photosynthesis.

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