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phosphoglucosamine mutase The MMP1680 protein from Methanococcus maripaludis has been characterized as the archaeal protein responsible for the second step of UDP-GlcNAc biosynthesis. This GlmM protein catalyzes the conversion of glucosamine-6-phosphate to glucosamine-1-phosphate. The first-characterized bacterial GlmM protein is modeled by TIGR01455. These two families are members of the larger phosphoglucomutase/phosphomannomutase family (characterized by three domains: pfam02878, pfam02879 and pfam02880), but are not nearest neighbors to each other. This model also includes a number of sequences from non-archaea in the Bacteroides, Chlorobi, Chloroflexi, Planctomycetes and Spirochaetes lineages. Evidence supporting their inclusion in this equivalog as having the same activity comes from genomic context and phylogenetic profiling. A large number of these organisms are known to produce exo-polysaccharide and yet only appeared to contain the GlmS enzyme of the GlmSMU pathway for UDP-GlcNAc biosynthesis (GenProp0750). In some organisms including Leptospira, this archaeal GlmM is found adjacent to the GlmS as well as a putative GlmU non-orthologous homolog. Phylogenetic profiling of the GlmS-only pattern using PPP identifies members of this archaeal GlmM family as the highest-scoring result. [Central intermediary metabolism, Amino sugars] |
Jiyao W et al.(2023). "The conserved domain database in 2023.",