Crystal structure of the RC-LH1 core complex from Rhodopseudomonas palustris

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From: Science(Vol. 302, Issue 5652)
Publisher: American Association for the Advancement of Science
Document Type: Article
Length: 2,710 words

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Abstract :

The crystal structure at 4.8 angstrom resolution of the reaction center-light harvesting 1 (RC-LH1) core complex from Rhodopseudomonas palustris shows the reaction center surrounded by an oval LH1 complex that consists of 15 pairs of transmembrane helical [alpha]- and [beta]-apoproteins and their coordinated bacteriochlorophylls. Complete closure of the RC by the LH1 is prevented by a single transmembrane helix, out of register with the array of inner LH1 [alpha]-apoproteins. This break, located next to the binding site in the reaction center for the secondary electron accepter ubiquinone (U[Q.sub.B]), may provide a portal through which U[Q.sub.B] can transfer electrons to cytochrome b/[c.sub.1].

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Gale Document Number: GALE|A111856469