4bww

Crystal structure of spin labelled azurin T21R1.

spinqualitylabelsall models 4bww, resolution 1.48Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4bww is a 4 chain structure. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: CU, GOL, NO3, SO4 NonStd Res: R1A Resources: FirstGlance, OCA, RCSB, PDBsum Function [AZUR_PSEAE] Transfers electrons from cytochrome c551 to cytochrome oxidase. Publication Abstract from PubMed BACKGROUND: EPR-based distance measurements between spin labels in proteins have become a valuable tool in structural biology. The direct translation of the experimental distances into structural information is however often impaired by the intrinsic flexibility of the spin labelled side chains. Different algorithms exist that predict the approximate conformation of the spin label either by using pre-computed rotamer libraries of the labelled side chain (rotamer approach) or by simply determining its accessible volume (accessible volume approach). Surprisingly, comparisons with many experimental distances have shown that both approaches deliver the same distance prediction accuracy of about 3 A. RESULTS: Here, instead of comparing predicted and experimental distances, we test the ability of both approaches to predict the actual conformations of spin labels found in a new high-resolution crystal structure of spin labelled azurin (T21R1). Inside the crystal, the label is found in two very different environments which serve as a challenging test for the in silico approaches. CONCLUSIONS: Our results illustrate why simple and more sophisticated programs lead to the same prediciton error. Thus, a more precise treatment of the complete environment of the label and also its interactions with the environment will be needed to increase the accuracy of in silico spin labelling algorithms. High-resolution crystal structure of spin labelled (T21R1) azurin from Pseudomonas aeruginosa: a challenging structural benchmark for in silico spin labelling algorithms.,Florin N, Schiemann O, Hagelueken G BMC Struct Biol. 2014 May 29;14(1):16. PMID:24884565 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Azurin

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