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uridine phosphorylase This model represents a family of bacterial and archaeal uridine phosphorylases unrelated to the mammalian enzymes of the same name. The E. coli, Salmonella and Klebsiella genes have been characterized. Sequences from Clostridium, Streptomyces, Treponema, Halobacterium and Pyrobaculum were included above trusted on the basis of sequence homology and a PAM-based neighbor-joining tree. A clade including second sequences from Halobacterium and Vibrio was somewhat more distantly related and may represent a slightly different substrate specificity - these were placed below the noise cutoff. More distantly related is a clade of archaeal sequences which as related to the DeoD family of inosine phosphorylases (TIGR00107) as they are to these uridine phosphorylases. This clade includes a characterized protein from Sulfolobus solfataricus which has been mis-named as a methylthioadenosine phosphorylase, but which acts on inosine and guanosine - it is unclear whether uridine has been evaluated as a substrate. [Purines, pyrimidines, nucleosides, and nucleotides, Salvage of nucleosides and nucleotides] |
Jiyao W et al.(2023). "The conserved domain database in 2023.",