2IOP

Crystal Structure of Full-length HtpG, the Escherichia coli Hsp90, Bound to ADP

Summary for 2IOP

• Entry DOI: 10.2210/pdb2iop/pdb
• Related: 1Y4S 1Y4U 2IOQ 2IOR
• Descriptor: Chaperone protein htpG, ADENOSINE-5'-DIPHOSPHATE (2 entities in total)
• Functional Keywords: heat shock protein, chaperone, hsp90
• Biological source: Escherichia coli
• Cellular location: Cytoplasm: P0A6Z3
• Total number of polymer chains: 4
• Total formula weight: 287786.49

Authors

Shiau, A.K.,Harris, S.F.,Agard, D.A. (deposition date: 2006-10-10, release date: 2006-11-21, Last modification date: 2024-02-21)

Primary citation

Shiau, A.K.,Harris, S.F.,Southworth, D.R.,Agard, D.A.
Structural Analysis of E. coli hsp90 reveals dramatic nucleotide-dependent conformational rearrangements.
Cell(Cambridge,Mass.), 127:329-340, 2006

PubMed Abstract: 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.

PubMed: 17055434
DOI: 10.1016/j.cell.2006.09.027

Experimental method

X-RAY DIFFRACTION (3.55 Å)