This is the 2B and 2B-like sub-domain found in TraI (EC:5.99.1.2) a relaxase of F-family plasmids. It contains four domains; a trans-esterase domain that executes the nicking and covalent attachment of the T-strand to the relaxase, a vestigial helica ...
This is the 2B and 2B-like sub-domain found in TraI (EC:5.99.1.2) a relaxase of F-family plasmids. It contains four domains; a trans-esterase domain that executes the nicking and covalent attachment of the T-strand to the relaxase, a vestigial helicase domain (carrying the 2B/2B-like sub-domain) that operates as an ssDNA-binding domain, an active 5' to 3' helicase domain, and a C-terminal domain that functions as a recruitment platform for relaxosome components. The 2B sub-domains in TraI are formed by residues 625-773 in the vestigial helicase domain and residues 1255-1397 in the active helicase domain. The 2B/2B-like sub-domain interacts with ssDNA where it contributes to the surface area where ssDNA bind. In other words the ssDNA-binding site is located in a groove between the 2B and 2B-like parts of the sub-domain. The sub-domain parts appear to act as clamps holding the ssDNA in place, resulting in the ssDNA being completely surrounded by protein. In previous studies, the 2B/2B-like sub-domain of the TraI vestigial helicase domain has been identified as translocation signal A (TSA) since it contains sequences essential for the recruitment of TraI to the T4S system. Thus, the 2B/2B-like sub-domain plays two major roles in relaxase function: (1) interacting with the DNA and possibly promoting high processivity and (2) mediating recruitment of the relaxosome to the T4S system [1].
Relaxases are DNA strand transferases which function during the conjugative cell to cell DNA transfer. TrwC binds to the origin of transfer (oriT) and melts the double helix.
This family of domains contain a P-loop motif that is characteristic of the AAA superfamily. Many of the proteins in this family are conjugative transfer proteins. There is a Walker A and Walker B.
single-stranded DNA binding TraI N-terminal subdomain
This is a subdomain found in TraI present in E. coli. Tra1 is a conjugative relaxase that forms part of the Type IV secretion system. This subdomain, referred to as 2A, is located in N-terminal region of the translocation signal (TSA) domain. TSA is ...
This is a subdomain found in TraI present in E. coli. Tra1 is a conjugative relaxase that forms part of the Type IV secretion system. This subdomain, referred to as 2A, is located in N-terminal region of the translocation signal (TSA) domain. TSA is known to reside in a larger ssDNA-binding domain [1].
This entry represents the C-terminal domain of the bacterial DNA helicase TraI (EC:3.6.1.-). TraI is a bifunctional protein that catalyses the unwinding of duplex DNA as well as acts as a sequence-specific DNA trans-esterase, providing the site- and ...
This entry represents the C-terminal domain of the bacterial DNA helicase TraI (EC:3.6.1.-). TraI is a bifunctional protein that catalyses the unwinding of duplex DNA as well as acts as a sequence-specific DNA trans-esterase, providing the site- and strand-specific nick required to initiate DNA transfer [1]. This domain is essential for conjugative DNA transfer [2].
