当前位置： SCI文献检索 > PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA期刊下所有文献 > Primary photochemistry of iron-depleted and zinc-reconstituted reaction centers from Rhodopseudomonas sphaeroides.

Primary photochemistry of iron-depleted and zinc-reconstituted reaction centers from Rhodopseudomonas sphaeroides.

Abstract：

:The primary photochemistry of Fe-depleted and Zn-reconstituted reaction centers from Rhodopseudomonas sphaeroides R-26.1 was studied by transient absorption spectroscopy and compared with native, Fe(2+)-containing reaction centers. Excitation of metal-free reaction centers with 30-ps flashes produced the initial charge-separated state P(+)I(-) (P(+)BPh(-), where P is the primary donor and BPh is bacteriopheophytin) with a yield and visible/near-infrared absorption difference spectrum indistinguishable from that observed in native reaction centers. However, the lifetime of P(+)I(-) was found to increase approximately 20-fold to 4.2 +/- 0.3 ns (compared to 205 ps in native reaction centers), and the yield of formation of the subsequent state P(+)Q(A) (-) (Q(A) is the primary quinone acceptor) was reduced to 47 +/- 5% (compared to essentially 100% in native reaction centers). The remaining 53% of the metal-free reaction centers were found to undergo charge recombination during the P(+)I(-) lifetime to yield both the ground state (28 +/- 5%) and the triplet state P(R) (25 +/- 5%). Reconstitution of Fe-depleted reaction centers with Zn(2+) restored the "native" photochemistry. Possible mechanisms responsible for the reduced decay rate of P(+)I(-) in metal-free reaction centers are discussed.

journal_name

Proc Natl Acad Sci U S A

journal_title

Proceedings of the National Academy of Sciences of the United States of America

authors

Kirmaier C,Holten D,Debus RJ,Feher G,Okamura MY

doi

10.1073/pnas.83.17.6407

subject

Has Abstract

pub_date

1986-09-01 00:00:00

pages

6407-11

issue

17

eissn

0027-8424

issn

1091-6490

journal_volume

83

pub_type

杂志文章

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