4xka

From Proteopedia

N-terminal domain of Hsp90 from Dictyostelium discoideum in hexagonal form with glycerol

Structural highlights

4xka is a 1 chain structure with sequence from Dictyostelium discoideum. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:	X-ray diffraction, Resolution 2Å
Ligands:	,
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

HSC90_DICDI Molecular chaperone that promotes the maturation, structural maintenance and proper regulation of specific target proteins involved for instance in cell cycle control and signal transduction. Undergoes a functional cycle that is linked to its ATPase activity. This cycle probably induces conformational changes in the client proteins, thereby causing their activation. Interacts dynamically with various co-chaperones that modulate its substrate recognition, ATPase cycle and chaperone function (By similarity).

Publication Abstract from PubMed

The involvement of Hsp90 in progression of diseases like cancer, neurological disorders and several pathogen related conditions is well established. Hsp90, therefore, has emerged as an attractive drug target for many of these diseases. Several small molecule inhibitors of Hsp90, such as geldanamycin derivatives, that display antitumor activity, have been developed and are under clinical trials. However, none of these tested inhibitors or drugs are peptide-based compounds. Here we report the first crystal structure of a peptide bound at the ATP binding site of the N-terminal domain of Hsp90. The peptide makes several specific interactions with the binding site residues, which are comparable to those made by the nucleotide and geldanamycin. A modified peptide was designed based on these interactions. Inhibition of ATPase activity of Hsp90 was observed in the presence of the modified peptide. This study provides an alternative approach and a lead peptide molecule for the rational design of effective inhibitors of Hsp90 function.

First Structural View of a Peptide Interacting with the Nucleotide Binding Domain of Heat Shock Protein 90.,Raman S, Singh M, Tatu U, Suguna K Sci Rep. 2015 Nov 24;5:17015. doi: 10.1038/srep17015. PMID:26599366^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Raman S, Singh M, Tatu U, Suguna K. First Structural View of a Peptide Interacting with the Nucleotide Binding Domain of Heat Shock Protein 90. Sci Rep. 2015 Nov 24;5:17015. doi: 10.1038/srep17015. PMID:26599366 doi:http://dx.doi.org/10.1038/srep17015