Document Detail

Photoinhibition induced alterations in energy transfer process in phycobilisomes of PS II in the cyanobacterium, Spirulina platensis.
MedLine Citation:
PMID:  17927895     Owner:  NLM     Status:  MEDLINE    
Exposure of algae or plants to irradiance from above the light saturation point of photosynthesis is known as high light stress. This high light stress induces various responses including photoinhibition of the photosynthetic apparatus. The degree of photoinhibition could be clearly determined by measuring the parameters such as absorption and fluorescence of chromoproteins. In cyanobacteria and red algae, most of the photosystem (PS) II associated light harvesting is performed by a membrane attached complex called the phycobilisome (PBS). The effects of high intensity light (1000-4000 micromol photons m(-2) s(-1)) on excitation energy transfer from PBSs to PS II in a cyanobacterium Spirulina platensis were studied by measuring room temperature PC fluorescence emission spectra. High light (3000 micromol photons m(-2) s(-1)) stress had a significant effect on PC fluorescence emission spectra. On the other hand, light stress induced an increase in the ratio of PC fluorescence intensity of PBS indicating that light stress inhibits excitation energy transfer from PBS to PS II. The high light treatment to 3000 micromol photons m(-2) s(-1) caused disappearance of 31.5 kDa linker polypeptide which is known to link PC discs together. In addition we observed the similar decrease in the other polypeptide contents. Our data concludes that the Spirulina cells upon light treatment causes alterations in the phycobiliproteins (PBPs) and affects the energy transfer process within the PBSs.
Duvvuri Prasanna Kumar; Sistla D S Murthy
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of biochemistry and molecular biology     Volume:  40     ISSN:  1225-8687     ISO Abbreviation:  J. Biochem. Mol. Biol.     Publication Date:  2007 Sep 
Date Detail:
Created Date:  2007-10-11     Completed Date:  2008-01-11     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9702084     Medline TA:  J Biochem Mol Biol     Country:  Korea (South)    
Other Details:
Languages:  eng     Pagination:  644-8     Citation Subset:  IM    
Department of Biochemistry, Sri Venkateswara University, Tirupati, India-517502.
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MeSH Terms
Bacterial Proteins / chemistry,  metabolism
Electrophoresis, Polyacrylamide Gel
Energy Transfer / radiation effects*
Photosystem I Protein Complex / chemistry,  metabolism,  radiation effects
Photosystem II Protein Complex / chemistry,  metabolism*
Phycobilisomes / chemistry,  metabolism,  radiation effects*
Spirulina / chemistry,  metabolism,  radiation effects*
Reg. No./Substance:
0/Bacterial Proteins; 0/Photosystem I Protein Complex; 0/Photosystem II Protein Complex; 0/Phycobilisomes

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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