1lia
From Proteopedia
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CRYSTAL STRUCTURE OF R-PHYCOERYTHRIN FROM POLYSIPHONIA AT 2.8 A RESOLUTION
Overview
The structure of R-phycoerythrin (R-PE) from Polysiphonia urceolata was, determined at 2.8 A resolution. The crystals belong to space group R3 with, unit cell dimensions of a = b = 189.8 A, c = 60.1 A. The subunit, composition of R-PE is (alpha 2 beta 2)3 gamma. The three-dimensional, structure of R-PE was solved by the multiple isomorphous replacement, method. After several cycles of model building and refinement, the, crystallographic R-factor of the final model is 18.0% with data from 10.0, to 2.8 A resolution. The four phycoerythrobilin chromophores alpha 84, alpha 140a, beta 84 and beta 155 in an (alpha beta) unit are each, covalently bound to a cysteine residue through ring A. The phycourobilin, chromophore is bound to cysteine beta 50 by ring A and bound to cysteine, beta 61 by ring D. The ring A and ring D of phycourobilin deviate from the, conjugate plane formed by ring B and ring C and the four rings form a, boat-shaped structure. R-PE contains a 34 kDa gamma subunit that is, assumed to lie in the central channel of the molecular disc (alpha 2 beta, 2)3. The energy transfer and relationship between cysteine residues and, chromophores are discussed.
About this Structure
1LIA is a Protein complex structure of sequences from Polysiphonia urceolata with CYC and PUB as ligands. Full crystallographic information is available from OCA.
Reference
Crystal structure of R-phycoerythrin from Polysiphonia urceolata at 2.8 A resolution., Chang WR, Jiang T, Wan ZL, Zhang JP, Yang ZX, Liang DC, J Mol Biol. 1996 Oct 11;262(5):721-31. PMID:8876649
Page seeded by OCA on Tue Nov 20 20:34:39 2007
