The name of this superfamily has been modified since the most recent official CATH+ release (v4_3_0). At the point of the last release, this superfamily was: waiting to be named.

Functional Families

Overview of the Structural Clusters (SC) and Functional Families within this CATH Superfamily. Clusters with a representative structure are represented by a filled circle.

Superfamily: GrpE nucleotide exchange factor, coiled-coil domain

In prokaryotes, the nucleotide exchange factor GrpE and the chaperone DnaJ are required for nucleotide binding of the molecular chaperone DnaK PMID:9103205. The DnaK reaction cycle involves rapid peptide binding and release, which is dependent upon nucleotide binding. DnaJ accelerates the hydrolysis of ATP by DnaK, which enables the ADP-bound DnaK to tightly bind peptide. GrpE catalyses the release of ADP from DnaK, which is required for peptide release. In eukaryotes, GrpE is essential for mitochondrial Hsp70 function, however the cytosolic Hsp70 homologues are GrpE-independent.

GrpE binds as a homodimer to the ATPase domain of DnaK, and may interact with the peptide-binding domain of DnaK. GrpE accomplishes nucleotide exchange by opening the nucleotide-binding cleft of DnaK. GrpE is comprised of two domains, the coiled coil domain, which may facilitate peptide release, and the head domain, which forms part of the contact surface with the ATPase domain of DnaK. This entry represents the coiled-coil domain.

GO Diversity

Unique GO annotations
33 Unique GO terms

EC Diversity

Unique EC annotations
0 Unique EC terms

Species Diversity

Unique species annotations
15979 Unique species

Sequence/Structure Diversity

Overview of the sequence / structure diversity of this superfamily compared to other superfamilies in CATH. Click on the chart to view the data in more detail.

Superfamily Summary

A general summary of information for this superfamily.
Domains: 4
Domain clusters (>95% seq id): 2
Domain clusters (>35% seq id): 2
Unique PDBs: 2
Structural Clusters (5A): 1
Structural Clusters (9A): 1
FunFam Clusters: 44
Unique EC:
Unique GO: 33
Unique Species: 15979