1cos | pdb_00001cos

CRYSTAL STRUCTURE OF A SYNTHETIC TRIPLE-STRANDED ALPHA-HELICAL BUNDLE

spinqualitylabelsall models 1cos, resolution 2.10Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1cos is a 3 chain structure. The October 2005 RCSB PDB Molecule of the Month feature on Designer Proteins by David S. Goodsell is 10.2210/rcsb_pdb/mom_2005_10. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. NonStd Res: ACE, NH2 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum Publication Abstract from PubMed The x-ray crystal structure of a peptide designed to form a double-stranded parallel coiled coil shows that it is actually a triple-stranded coiled coil formed by three alpha-helices. Unlike the designed parallel coiled coil, the helices run up-up-down. The structure is stabilized by a distinctive hydrophobic interface consisting of eight layers. As in the design, each alpha-helix in the coiled coil contributes one leucine side chain to each layer. The structure suggests that hydrophobic interactions are a dominant factor in the stabilization of coiled coils. The stoichiometry and geometry of coiled coils are primarily determined by side chain packing in the solvent-inaccessible interior, but electrostatic interactions also contribute. Crystal structure of a synthetic triple-stranded alpha-helical bundle.,Lovejoy B, Choe S, Cascio D, McRorie DK, DeGrado WF, Eisenberg D Science. 1993 Feb 26;259(5099):1288-93. PMID:8446897 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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