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glutamine synthetase, type I Alternate name: glutamate--ammonia ligase. This model represents the dodecameric form, which can be subdivided into 1-alpha and 1-beta forms. The phylogeny of the 1-alpha and 1-beta forms appears polyphyletic. E. coli, Synechocystis PCC6803, Aquifex aeolicus, and the crenarcheon Sulfolobus acidocaldarius have form 1-beta, while Bacillus subtilis, Thermotoga maritima, and various euryarchaea has form 1-alpha. The 1-beta dodecamer from the crenarcheon Sulfolobus acidocaldarius differs from that in E. coli in that it is not regulated by adenylylation. [Amino acid biosynthesis, Glutamate family]
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Jiyao W et al.(2023). "The conserved domain database in 2023.",