1yst
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(New page: 200px<br /><applet load="1yst" size="450" color="white" frame="true" align="right" spinBox="true" caption="1yst, resolution 3.0Å" /> '''STRUCTURE OF THE PHOT...)
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Revision as of 04:54, 21 November 2007
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STRUCTURE OF THE PHOTOCHEMICAL REACTION CENTER OF A SPHEROIDENE CONTAINING PURPLE BACTERIUM, RHODOBACTER SPHAEROIDES Y, AT 3 ANGSTROMS RESOLUTION
Overview
The crystal structure of the photochemical reaction centre from, Rhodobacter sphaeroides Y, a carotenoid-containing wild-type purple, bacterium, has been determined at 3 A resolution. This membrane complex, consists of three subunits (281, 307 and 260 residues, respectively) and, ten cofactors. It was crystallized in presence of beta-D-octylglucoside., The crystals are orthorhombic with unit-cell dimensions, a = 143.7, b =, 139.8, c = 78.7 A, space group P2(1)2(1)2(1) with four molecules in the, unit cell. Refinement of the structure by X-PLOR and manual, reconstructions yielded an R value of 22.1% for 19630 reflections between, 7 and 3 A. The secondary structure is highly homologous to those, determined for Rhodopseudomonas viridis (Protein Data Bank entry 1PRC) and, Rhodobacter sphaeroides R26 (Protein Data Bank entry 4RCR) reaction, centres. In the latter two structures one Fe(2+) ion located between the, two quinones is coordinated by four histidines and one glutamic acid. In, the Rhodobacter sphaeroides Y structure, Mn(2+) occupies the same position, with identical ligands and geometry. The carotenoid conformation which is, a non-planar 15-15'-cis spheroidene molecule in our structure differs from, the 13-14-cis 2,4-dihydroneusporene in the Rhodopseudomonas viridis, structure.
About this Structure
1YST is a Protein complex structure of sequences from Rhodobacter sphaeroides with MN, BCL, BPH, SPO and U10 as ligands. Full crystallographic information is available from OCA.
Reference
Structure of the photochemical reaction centre of a spheroidene-containing purple-bacterium, Rhodobacter sphaeroides Y, at 3 A resolution., Arnoux B, Gaucher JF, Ducruix A, Reiss-Husson F, Acta Crystallogr D Biol Crystallogr. 1995 May 1;51(Pt 3):368-79. PMID:15299304
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