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Glutamine amidotransferases class-II (Gn-AT), glutamate synthase (GltS)-type. GltS is a homodimer that synthesizes L-glutamate from 2-oxoglutarate and L-glutamine, an important step in ammonia assimilation in bacteria, cyanobacteria and plants. The N-terminal glutaminase domain catalyzes the hydrolysis of glutamine to glutamic acid and ammonia, and has a fold similar to that of other glutamine amidotransferases such as glucosamine-fructose 6-phosphate synthase (GLMS or GFAT), glutamine phosphoribosylpyrophosphate (Prpp) amidotransferase (GPATase), asparagine synthetase B (AsnB), and beta lactam synthetase (beta-LS), as well as the Ntn hydrolase folds of the proteasomal alpha and beta subunits.
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Jiyao W et al.(2023). "The conserved domain database in 2023.",