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S-methyl-5-thioribose-1-phosphate isomerase The delineation of this family was based in part on a discussion and neighbor-joining phylogenetic study, by Kyrpides and Woese, of archaeal and other proteins homologous to the alpha, beta, and delta subunits of eukaryotic initiation factor 2B (eIF-2B), a five-subunit molecule that catalyzes GTP recycling for eIF-2. This clade is now recognized to include the methionine salvage pathway enzyme MtnA. [Amino acid biosynthesis, Aspartate family]
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Jiyao W et al.(2023). "The conserved domain database in 2023.",