Primary Citation of Related Structures: 6Z5R, 6Z5S
PubMed Abstract:
The reaction-center light-harvesting complex 1 (RC-LH1) is the core photosynthetic component in purple phototrophic bacteria. We present two cryo-electron microscopy structures of RC-LH1 complexes from Rhodopseudomonas palustris A 2.65-Å resolution structure of the RC-LH1 14 -W complex consists of an open 14-subunit LH1 ring surrounding the RC interrupted by protein-W, whereas the complex without protein-W at 2.80-Å resolution comprises an RC completely encircled by a closed, 16-subunit LH1 ring. Comparison of these structures provides insights into quinone dynamics within RC-LH1 complexes, including a previously unidentified conformational change upon quinone binding at the RC Q B site, and the locations of accessory quinone binding sites that aid their delivery to the RC. The structurally unique protein-W prevents LH1 ring closure, creating a channel for accelerated quinone/quinol exchange.
Organizational Affiliation:
Department of Molecular Biology and Biotechnology, University of Sheffield, Sheffield, S10 2TN, UK. d.swainsbury@sheffield.ac.uk c.n.hunter@sheffield.ac.uk.
AB [auth I] ED [auth Z] EE [auth 8] FB [auth K] JD [auth B]
AB [auth I], ED [auth Z], EE [auth 8], FB [auth K], JD [auth B], JE [auth 0], KB [auth O], LB [auth H], LC [auth S], MA [auth D], OA [auth E], OD [auth 2], PC [auth U], QB [auth L], RB [auth L], SA [auth F], TC [auth X], TD [auth 4], VD [auth 5], WC [auth P], XB [auth M], YA [auth I], YD [auth 6], ZC [auth Q]
(4S,7R)-4-HYDROXY-N,N,N-TRIMETHYL-9-OXO-7-[(PALMITOYLOXY)METHYL]-3,5,8-TRIOXA-4-PHOSPHAHEXACOSAN-1-AMINIUM 4-OXIDE C42 H85 N O8 P PZNPLUBHRSSFHT-RRHRGVEJSA-O
(6~{R},10~{S},14~{R},19~{R},23~{S},24~{E},27~{S},28~{E})-2,6,10,14,19,23,27,31-octamethyldotriaconta-24,28-dien-2-ol C40 H78 O NKXXNXZGYNRQNV-BTRAWPHCSA-N
A [auth C] BA [auth 3] C [auth E] DA [auth 5] E [auth G]
A [auth C], BA [auth 3], C [auth E], DA [auth 5], E [auth G], FA [auth 7], G [auth J], HA [auth 9], I [auth N], N [auth R], P [auth T], R [auth V], T [auth P], V [auth Y], X [auth A], Z [auth 1]
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