4r5k

Crystal structure of the DnaK C-terminus (Dnak-SBD-B)

spinqualitylabelsall models 4r5k, resolution 1.75Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4r5k is a 2 chain structure with sequence from Escherichia coli K-12. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: CA, SO4 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function DNAK_ECOLI Plays an essential role in the initiation of phage lambda DNA replication, where it acts in an ATP-dependent fashion with the DnaJ protein to release lambda O and P proteins from the preprimosomal complex. DnaK is also involved in chromosomal DNA replication, possibly through an analogous interaction with the DnaA protein. Also participates actively in the response to hyperosmotic shock.[HAMAP-Rule:MF_00332] Publication Abstract from PubMed The stress-inducible mammalian heat shock protein 70 (HSP70) and its bacterial orthologue DnaK are highly conserved nucleotide binding molecular chaperones. They represent critical regulators of cellular proteostasis, especially during conditions of enhanced stress. Cancer cells rely on HSP70 for survival, and this chaperone represents an attractive new therapeutic target. We have used a structure-activity approach and biophysical methods to characterize a class of inhibitors that bind to a unique allosteric site within the C-terminus of HSP70 and DnaK. Data from X-ray crystallography together with isothermal titration calorimetry, mutagenesis, and cell-based assays indicate that these inhibitors bind to a previously unappreciated allosteric pocket formed within the non-ATP-bound protein state. Moreover, binding of inhibitor alters the local protein conformation, resulting in reduced chaperone-client interactions and impairment of proteostasis. Our findings thereby provide a new chemical scaffold and target platform for both HSP70 and DnaK; these will be important tools with which to interrogate chaperone function and to aid ongoing efforts to optimize potency and efficacy in developing modulators of these chaperones for therapeutic use. Structural Basis for the Inhibition of HSP70 and DnaK Chaperones by Small-Molecule Targeting of a C-Terminal Allosteric Pocket.,Leu JI, Zhang P, Murphy ME, Marmorstein R, George DL ACS Chem Biol. 2014 Aug 28. PMID:25148104 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Heat Shock Protein structures

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