| Literature DB >> 21393013 |
Eugene G Maksimov1, Fedor I Kuzminov, Ivan V Konyuhov, Irina V Elanskaya, Vladimir Z Paschenko.
Abstract
The effective fluorescence cross-section of photosystem 2 (PS2) was defined by measurements of chlorophyll a fluorescence induction curves for the wild type of the unicellular cyanobacterium Synechocystis sp. PCC6803, C-phycocyanin deficient mutant (CK), and mutant that totally lacks phycobilisomes (PAL). It was shown that mutations lead to a strong decrease of the PS2 effective fluorescence cross-section. For instance, the effective fluorescence cross-section of PS2 for wild type, CK and PAL mutants excited at λ(ex)=655 nm were found to be 896, 220 and 83 Å(2) respectively. Here we present an estimation of energy transfer efficiency from phycobilisomes to the pigment-protein complexes of PS2. It was shown that the PS2 fluorescence enhancement coefficient reaches a maximum value of 10.7 due to the energy migration from phycobilisomes. The rate constant of energy migration was found to be equal to 1.04 × 10(10) s(-1).Entities:
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Year: 2011 PMID： 21393013 DOI： 10.1016/j.jphotobiol.2011.02.011
Source DB: PubMed Journal: J Photochem Photobiol B ISSN： 1011-1344 Impact factor: 6.252