1QY5: Crystal Structure Of The N-Domain Of The Er Hsp90 Chaperone Grp94 In Complex With The Specific Ligand Neca

GRP94, the endoplasmic reticulum (ER) paralog of the chaperone Hsp90, plays an essential role in the structural maturation or secretion of a subset of proteins destined for transport to the cell surface, such as the Toll-like receptors 2 and 4, and IgG, respectively. GRP94 differs from cytoplasmic Hsp90 by exhibiting very weak ATP binding and hydrolysis activity. GRP94 also binds selectively to a series of substituted adenosine analogs. The high resolution crystal structures at 1.75-2.1 A of the N-terminal and adjacent charged domains of GRP94 in complex with N-ethylcarboxamidoadenosine, radicicol, and 2-chlorodideoxyadenosine reveals a structural mechanism for ligand discrimination among hsp90 family members. The structures also identify a putative subdomain that may act as a ligand-responsive switch. The residues of the charged region fold into a disordered loop whose termini are ordered and continue the twisted beta sheet that forms the structural core of the N-domain. This continuation of the beta sheet past the charged domain suggests a structural basis for the association of the N-terminal and middle domains of the full-length chaperone.
PDB ID: 1QY5Download
MMDB ID: 25424
PDB Deposition Date: 2003/9/9
Updated in MMDB: 2003/12
Experimental Method:
x-ray diffraction
Resolution: 1.75  Å
Source Organism:

*This structure record is obsolete.

Molecular Components in 1QY5
Label Count Molecule
Protein (1 molecule)
Molecule annotation
Chemicals (2 molecules)
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Citing MMDB