Chaperone J-domain superfamily
SCOP classification
InterPro annotation
| Cross references | IPR001623 SSF46565 Protein matches |
| Abstract | The prokaryotic heat shock protein DnaJ interacts with the chaperone hsp70-like DnaK protein [ 8016869]. Structurally, the DnaJ protein consists of an N-terminal conserved domain (called 'J' domain) of about 70 amino acids, a glycine-rich region ('G' domain') of about 30 residues, a central domain containing four repeats of a CXXCXGXG motif ('CRR' domain) and a C-terminal region of 120 to 170 residues.
Such a structure is shown in the following schematic representation:
+------------+-+-------+-----+-----------+--------------------------------+
| N-terminal | | Gly-R | | CXXCXGXG | C-terminal |
+------------+-+-------+-----+-----------+--------------------------------+
It is thought that the 'J' domain of DnaJ mediates the interaction with the dnaK protein and consists of four helices, the second of which has a charged surface that includes at least one pair of basic residues that are essential for interaction with the ATPase domain of Hsp70. The J- and CRR-domains are found in many prokaryotic and eukaryotic proteins [1585456], either together or separately. In yeast, J-domains have been classified into 3 groups; the class III proteins are functionally distinct and do not appear to act as molecular chaperones [15170475]. |
InterPro database
Functional annotation
| General category | Processes_IC |
| Detailed category | Protein modification |
Function annotation of SCOP domain superfamilies
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Internal database links
The SUPERFAMILY hidden Markov model library has been used to carry
out SCOP domain assignments to all genomes at the superfamily level. Click on the 'Genome Assignments'
icon above to view the genome assignments for this superfamily.
Alignments of sequences to Alignments of sequences to 8 models
in this superfamily are available by clicking on the superfamily level 'Alignments' icon above. PDB sequences less than 40% identical
are shown by default, but any other sequences may be aligned. Select PDB sequences, genome sequences, or paste in or upload your own.
It is possible to browse and view the proteins in the genomes which have
different combinations of domains including a Chaperone J-domain domain. Click on the 'Domain Combinations' icon.
To view the distribution of domain superfamilies, or families, across the major taxonomic kingdoms or genomes within a kingdom click on the 'TaxViz' icon above. This gives an immediate impression of how superfamilies, or families, are restricted to certain kingdoms of life.
Undirected domain occurrence networks are available for all superfamilies. Nodes in these networks represent genomes. Connections between nodes represent the presence of domain architectures, which contain the superfamily of interest, in both genomes.
There are 8 hidden Markov models representing the Chaperone J-domain superfamily. Information on how the models are built, and plots showing hydrophobicity, match emmission probabilities and insertion/deletion probabilities can be viewed by clicking on the icon above.
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