3hbt | pdb_00003hbt

The structure of native G-actin

spinqualitylabelsall models 3hbt, resolution 2.70Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3hbt is a 1 chain structure with sequence from Oryctolagus cuniculus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: ATP, CA, SO4 NonStd Res: HIC Resources: FirstGlance, OCA, RCSB, PDBsum Publication Abstract from PubMed Heat shock proteins act as cytoplasmic chaperones to ensure correct protein folding and prevent protein aggregation. The presence of stoichiometric amounts of one such heat shock protein, Hsp27, in supersaturated solutions of unmodified G-actin leads to crystallization, in preference to polymerization, of the actin. Hsp27 is not evident in the resulting crystal structure. Thus, for the first time, we present the structure of G-actin in a form that is devoid of polymerization-deterring chemical modifications or binding partners, either of which may alter its conformation. The structure contains a calcium ion and ATP within a closed nucleotide-binding cleft, and the D-loop is disordered. This native G-actin structure invites comparison with the current F-actin model in order to understand the structural implications for actin polymerization. In particular, this analysis suggests a mechanism by which the bound cation coordinates conformational change and ATP-hydrolysis. The structure of native G-actin.,Wang H, Robinson RC, Burtnick LD Cytoskeleton (Hoboken). 2010 Jul;67(7):456-65. PMID:20540085 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Actin

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