1ob4

Cephaibol A

spinqualitylabelsall models 1ob4, resolution 0.95Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1ob4 is a 1 chain structure with sequence from Acremonium tubakii. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 0.95Å Ligands: ACE, AIB, DIV, EOH, HYP, PHL, PRD_000156 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed The crystal structures of the peptaibol antibiotics cephaibol A, cephaibol B and cephaibol C have been determined at ca. 0.9 A resolution. All three adopt a helical conformation with a sharp bend (of about 55 degrees) at the central hydroxyproline. All isovalines were found to possess the D configuration, superposition of all four models (there are two independent molecules in the cephaibol B structure) shows that the N-terminal helix is rigid and the C-terminus is flexible. There are differences in the hydrogen bonding patterns for the three structures that crystallize in different space groups despite relatively similar unit cell dimensions, but only in the case of cephaibol C does the packing emulate the formation of a membrane channel believed to be important for their biological function. Crystal structures of cephaibols.,Bunkoczi G, Schiell M, Vertesy L, Sheldrick GM J Pept Sci. 2003 Nov-Dec;9(11-12):745-52. PMID:14658793 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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