Type 1 glutamine amidotransferase (GATase1)-like domain found in Escherichia coli Hsp31 protein (EcHsp31)
Type 1 glutamine amidotransferase (GATase1)-like domain found in Escherichia coli Hsp31 protein (EcHsp31). This group includes proteins similar to EcHsp31. EcHsp31 has chaperone activity. EcHsp31 coordinates a metal ion using a 2-His-1-carboxylate motif present in various ions that use iron as a cofactor such as Carboxypeptidase A. The catalytic triad typical of GATase1 domains is not conserved in this GATase1-like domain. However, in common with a typical GATase1domain, a reactive Cys residue is found in the sharp turn between a beta strand and an alpha helix termed the nucleophile elbow. This Cys together with a different His and, an Asp (rather than a Glu) residue form a different catalytic triad from the typical GATase1 domain. EcHsp31 is a homodimer.