2QW9

Crystal structure of bovine hsc70 (1-394aa)in the apo state

Summary for 2QW9

• Entry DOI: 10.2210/pdb2qw9/pdb
• Related: 2QWL 2QWM 2QWN 2QWO 2QWP 2QWQ 2QWR
• Descriptor: Heat shock cognate 71 kDa protein, GLYCEROL (3 entities in total)
• Functional Keywords: chaperone, atp-binding, nucleotide-binding, nucleus, phosphorylation, stress response
• Biological source: Bos taurus (cattle)
• Cellular location: Cytoplasm : P19120
• Total number of polymer chains: 2
• Total formula weight: 86936.31

Authors

Jiang, J.,Maes, E.G.,Wang, L.,Taylor, A.B.,Hinck, A.P.,Lafer, E.M.,Sousa, R. (deposition date: 2007-08-10, release date: 2007-12-18, Last modification date: 2024-02-21)

Primary citation

Jiang, J.,Maes, E.G.,Taylor, A.B.,Wang, L.,Hinck, A.P.,Lafer, E.M.,Sousa, R.
Structural basis of J cochaperone binding and regulation of Hsp70.
Mol.Cell, 28:422-433, 2007

PubMed Abstract: The many protein processing reactions of the ATP-hydrolyzing Hsp70s are regulated by J cochaperones, which contain J domains that stimulate Hsp70 ATPase activity and accessory domains that present protein substrates to Hsp70s. We report the structure of a J domain complexed with a J responsive portion of a mammalian Hsp70. The J domain activates ATPase activity by directing the linker that connects the Hsp70 nucleotide binding domain (NBD) and substrate binding domain (SBD) toward a hydrophobic patch on the NBD surface. Binding of the J domain to Hsp70 displaces the SBD from the NBD, which may allow the SBD flexibility to capture diverse substrates. Unlike prokaryotic Hsp70, the SBD and NBD of the mammalian chaperone interact in the ADP state. Thus, although both nucleotides and J cochaperones modulate Hsp70 NBD:linker and NBD:SBD interactions, the intrinsic persistence of those interactions differs in different Hsp70s and this may optimize their activities for different cellular roles.

PubMed: 17996706
DOI: 10.1016/j.molcel.2007.08.022

Experimental method

X-RAY DIFFRACTION (1.85 Å)