This domain is a class-II glutamine amidotransferase domain found in a variety of enzymes such as asparagine synthetase and glutamine-fructose-6-phosphate transaminase.
Asparagine synthetase B catalyses the ATP-dependent conversion of aspartate to asparagine [PMID: 11551215]. This enzyme is a homodimer, with each monomer composed of a glutaminase domain and a synthetase domain. It forms part of the pathway for the biosythesis of the beta-lactamase inhibitor clavulanate in Streptomyces clavuligerus. This entry represents the reaction occuring in the synthetase domain in which the L-N2-(2-carboxyethyl)arginine is first converted into an acyl-AMP by reaction with ATP and loss of diphosphate, and that the beta-lactam ring is then formed by the intramolecular attack of the beta-nitrogen on the activated carboxy group [PMID:9689037].
Defined by 3 residues: TYR:A-348GLU:A-382LYS:A-443