✦ LIBER ✦

The peculiarities of the electron transfer from cytochrome to the cation-radical of bacteriochlorophyll dimer in reaction centers from Rps. viridis

✍ Scribed by Fyodor I. Dalidchik; Eugen N. Frolov; Vitalii I. Goldanskii

Publisher: Elsevier Science
Year: 1994
Tongue: English
Weight: 349 KB
Volume: 223
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(94)00480-3

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✦ Synopsis

The kinetics of tunnel electron transitions in reaction centers of photosynthetic bacteria Rkodopseudomonas viridis are characterized by paradoxical peculiarities. ( 1) The time of the high-temperature (300 K) transfer of an electron to the cation-radical of bacteriochlorophyll BCl: from the neigbbour heme C 38c is almost twice as long as that from the almost .twice as distant heme C, (2) At low temperature (77 K) the majority (~~80%) of nearby hemes C rsc is unable to reduce BCl$ while all remote hemes Czc participate effectively in such reductions as though they disconnect C 3W hemes. Both these peculiarities find their explanation on the basis of the mechanism of two-electron relay tunneling: C380+C-BCl$, CzD+c-C3+80.

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