>PF00684 DnaJ_CXXCXGXG: DnaJ central domain; InterPro: IPR001305 The hsp70 chaperone machine performs many diverse roles in the cell, including folding of nascent proteins, translocation of polypeptides across organelle membranes, coordinating responses to stress, and targeting selected proteins for degradation
DnaJ is a member of the hsp40 family of molecular chaperones, which is also called the J-protein family, the members of which regulate the activity of hsp70s. DnaJ (hsp40) binds to DnaK (hsp70) and stimulates its ATPase activity, generating the ADP-bound state of DnaK, which interacts stably with the polypeptide substrate []. Besides stimulating the ATPase activity of DnaK through its J-domain, DnaJ also associates with unfolded polypeptide chains and prevents their aggregation []. DnaJ consists of an N-terminal conserved domain (called 'J' domain) of about 70 amino acid residues, a glycine and phenylalanine-rich domain ('G/F' domain), a central cysteine rich domain (CR-type zinc finger) containing four repeats of a CXXCXGXG motif which can coordinate two zinc atom and a C-terminal domain (CTD) []. This entry represents the central cysteine-rich (CR) domain of DnaJ proteins. This central cysteine rich domain (CR-type zinc finger) has an overall V-shaped extended beta-hairpin topology and contains four repeats of the motif CXXCXGXG where X is any amino acid. The isolated cysteine rich domain folds in zinc dependent fashion. Each set of two repeats binds one unit of zinc. Although this domain has been implicated in substrate binding, no evidence of specific interaction between the isolated DnaJ cysteine rich domain and various hydrophobic peptides has been found [].; GO: 0031072 heat shock protein binding, 0051082 unfolded protein binding; PDB: 1NLT_A 2CTT_A 1EXK_A.
>cd03031 GRX_GRX_like Glutaredoxin (GRX) family, GRX-like domain containing protein subfamily; composed of uncharacterized eukaryotic proteins containing a GRX-like domain having only one conserved cysteine, aligning to the C-terminal cysteine of the CXXC motif of GRXs
This subfamily is predominantly composed of plant proteins. GRX is a glutathione (GSH) dependent reductase, catalyzing the disulfide reduction of target proteins via a redox active CXXC motif using a similar dithiol mechanism employed by TRXs. GRX has preference for mixed GSH disulfide substrates, in which it uses a monothiol mechanism where only the N-terminal cysteine is required. Proteins containing only the C-terminal cysteine are generally redox inactive.
This model represents bacterial forms of DnaJ, part of the DnaK-DnaJ-GrpE chaperone system. The three components typically are encoded by consecutive genes. DnaJ homologs occur in many genomes, typically not near DnaK and GrpE-like genes; most such genes are not included by this family. Eukaryotic (mitochondrial and chloroplast) forms are not included in the scope of this family.
>PF00684 DnaJ_CXXCXGXG: DnaJ central domain; InterPro: IPR001305 The hsp70 chaperone machine performs many diverse roles in the cell, including folding of nascent proteins, translocation of polypeptides across organelle membranes, coordinating responses to stress, and targeting selected proteins for degradation
DnaJ is a member of the hsp40 family of molecular chaperones, which is also called the J-protein family, the members of which regulate the activity of hsp70s. DnaJ (hsp40) binds to DnaK (hsp70) and stimulates its ATPase activity, generating the ADP-bound state of DnaK, which interacts stably with the polypeptide substrate []. Besides stimulating the ATPase activity of DnaK through its J-domain, DnaJ also associates with unfolded polypeptide chains and prevents their aggregation []. DnaJ consists of an N-terminal conserved domain (called 'J' domain) of about 70 amino acid residues, a glycine and phenylalanine-rich domain ('G/F' domain), a central cysteine rich domain (CR-type zinc finger) containing four repeats of a CXXCXGXG motif which can coordinate two zinc atom and a C-terminal domain (CTD) []. This entry represents the central cysteine-rich (CR) domain of DnaJ proteins. This central cysteine rich domain (CR-type zinc finger) has an overall V-shaped extended beta-hairpin topology and contains four repeats of the motif CXXCXGXG where X is any amino acid. The isolated cysteine rich domain folds in zinc dependent fashion. Each set of two repeats binds one unit of zinc. Although this domain has been implicated in substrate binding, no evidence of specific interaction between the isolated DnaJ cysteine rich domain and various hydrophobic peptides has been found [].; GO: 0031072 heat shock protein binding, 0051082 unfolded protein binding; PDB: 1NLT_A 2CTT_A 1EXK_A.
This model represents bacterial forms of DnaJ, part of the DnaK-DnaJ-GrpE chaperone system. The three components typically are encoded by consecutive genes. DnaJ homologs occur in many genomes, typically not near DnaK and GrpE-like genes; most such genes are not included by this family. Eukaryotic (mitochondrial and chloroplast) forms are not included in the scope of this family.
This uncharacterized protein is found in prophage regions of Shewanella oneidensis MR-1, Vibrio vulnificus YJ016, Yersinia pseudotuberculosis IP 32953, and Aeromonas hydrophila ATCC7966. It appears to have regions of sequence similarity to phage lambda antitermination protein Q.
>PF05129 Elf1: Transcription elongation factor Elf1 like; InterPro: IPR007808 This family of uncharacterised, mostly short, proteins contain a putative zinc binding domain with four conserved cysteines
This uncharacterized protein is found in prophage regions of Shewanella oneidensis MR-1, Vibrio vulnificus YJ016, Yersinia pseudotuberculosis IP 32953, and Aeromonas hydrophila ATCC7966. It appears to have regions of sequence similarity to phage lambda antitermination protein Q.
>TIGR02098 MJ0042_CXXC MJ0042 family finger-like domain
This domain contains a CXXCX(19)CXXC motif suggestive of both zinc fingers and thioredoxin, usually found at the N-terminus of prokaryotic proteins. One partially characterized gene, agmX, is among a large set in Myxococcus whose interruption affects adventurous gliding motility.
