期刊
PHOTOCHEMICAL & PHOTOBIOLOGICAL SCIENCES
卷 7, 期 8, 页码 956-962出版社
SPRINGERNATURE
DOI: 10.1039/b719122g
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资金
- The Russian Academy of Sciences
- The Russian Foundation of Basic Research [08-04-00143]
The photostability of P700 cation radical (P700(+)) was studied by evaluating the quantum yields of P700(+) photodestruction in photosystem I (PSI) complexes of the cyanobacterium Arthrospira platensis. The time courses of P700(+) photodestruction in PSI trimers and monomers have been measured in aerobic conditions under selective excitation of far-red absorption band of P700(+) by intense light of laser diodes. Long-term exposure of PSI complexes to 808 or 870 nm laser light caused destruction of P700(+) and antenna chlorophylls. The true integral quantum yield of P700(+) photodestruction calculated from these data was less than 0.7-1.4 x 10(-8). Illumination of PSI complexes by 650 nm light caused destruction of antenna chlorophylls with true quantum yield of about 6-7 x 10(-6) and damage of P700 with apparent quantum yield 2-3 x 10(-8). Preferential photodestruction of the long-wavelength antenna chlorophyll absorbing at 7 10 nm as compared with bulk chlorophylls was observed. About three orders of difference in magnitude between quantum yields of P700(+) and bulk chlorophyll photodestruction indicates that P700(+) is extremely photostable for functioning as an efficient quencher of singlet excitation energy in PSI.
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