2ioq | pdb_00002ioq

Crystal Structure of full-length HTPG, the Escherichia coli HSP90

spinqualitylabelsall models 2ioq, resolution 3.50Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2ioq is a 2 chain structure with sequence from Escherichia coli. The December 2008 RCSB PDB Molecule of the Month feature on Hsp90 by David Goodsell is 10.2210/rcsb_pdb/mom_2008_12. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Related: 1y4u, 1y4s, 2iop, 2ior Gene: htpG (Escherichia coli) Resources: FirstGlance, OCA, RCSB, PDBsum Function [HTPG_ECOLI] Molecular chaperone. Has ATPase activity.[HAMAP-Rule:MF_00505] Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed In eukaryotes, the ubiquitous and abundant members of the 90 kilodalton heat-shock protein (hsp90) chaperone family facilitate the folding and conformational changes of a broad array of proteins important in cell signaling, proliferation, and survival. Here we describe the effects of nucleotides on the structure of full-length HtpG, the Escherichia coli hsp90 ortholog. By electron microscopy, the nucleotide-free, AMPPNP bound, and ADP bound states of HtpG adopt completely distinct conformations. Structural characterization of nucleotide-free and ADP bound HtpG was extended to higher resolution by X-ray crystallography. In the absence of nucleotide, HtpG exhibits an "open" conformation in which the three domains of each monomer present hydrophobic elements into the large cleft formed by the dimer. By contrast, ADP binding drives dramatic conformational changes that allow these hydrophobic elements to converge and shield each other from solvent, suggesting a mechanism by which nucleotides could control client protein binding and release. Structural Analysis of E. coli hsp90 reveals dramatic nucleotide-dependent conformational rearrangements.,Shiau AK, Harris SF, Southworth DR, Agard DA Cell. 2006 Oct 20;127(2):329-40. PMID:17055434 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Heat Shock Proteins

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