A member of the ATP-grasp fold predicted to be involved in the biosynthesis of cell surface polysaccharides such as the O-antigen in proteobacteria, the capsule in firmicutes and the polyglutamate chain of teichuronopeptide [1].

1: Amidoligases with ATP-grasp, glutamine synthetase-like and acetyltransferase-like domains: synthesis of novel metabolites and peptide modifications of proteins. Iyer LM, Abhiman S, Maxwell Burroughs A, Aravind L; Mol Biosyst. 2009;5:1636-1660. PMID:20023723