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pubmed-article:9530508pubmed:abstractTextPhycobilisomes (PBS), the major light harvesting antenna of the cyanobacterium Synechococcus contain phycocyanin (PC) and allophycocyanin (APC) as major pigment-protein complexes. PBS also absorb ultraviolet-B (280-320 nm) radiation. Exposure of Synechococcus PBS to low dose of UV-B (approximately 0.28 mw.cm-2) for 90 min induced change in absorption, emission and excitation characteristics of PBS and these changes got enhanced after 3 h of exposure. Room temperature excitation and emission spectra clearly indicated uncoupling of energy transfer from PC to APC on exposure to UV-B. Also, the 77K emission spectra suggested that F682 emission originating from APC decreased by 42% after 3 h of exposure. Circular dichroism (CD) spectra of UV-B exposed PBS indicated changes (14% decrease) in the alpha-helical content after 90 min treatment. SDS-PAGE analysis indicated degradation of a 75 kDa polypeptide (which appear to be a linker polypeptide) on UV-B treatment. The degradation of this polypeptide seems to induce changes in pigment-protein interaction and decoupling of energy transfer within the PBS. Our results for the first time clearly indicate that the PBS of Synechococcus are targets for UV-B damage.lld:pubmed
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pubmed-article:9530508pubmed:authorpubmed-author:SrivastavaMMlld:pubmed
pubmed-article:9530508pubmed:authorpubmed-author:MohantyPPlld:pubmed
pubmed-article:9530508pubmed:authorpubmed-author:TeeK SKSlld:pubmed
pubmed-article:9530508pubmed:authorpubmed-author:KrishnaK BKBlld:pubmed
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pubmed-article:9530508pubmed:volume44lld:pubmed
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pubmed-article:9530508pubmed:pagination245-57lld:pubmed
pubmed-article:9530508pubmed:dateRevised2006-11-15lld:pubmed
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pubmed-article:9530508pubmed:year1998lld:pubmed
pubmed-article:9530508pubmed:articleTitleEffects of ultraviolet-B radiation on phycobilisomes of Synechococcus PCC 7942: alterations in conformation and energy transfer characteristics.lld:pubmed
pubmed-article:9530508pubmed:affiliationSchool of Life Sciences, Jawaharlal Nehru University, New Delhi, India.lld:pubmed
pubmed-article:9530508pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:9530508pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed