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Nucleotide loop assembly pathway in Salmonella enterica serovar Typhimurium LT2. Intermediates are boxed and shown below structures; enzyme names are shown above or left of arrows. Abbreviations: AP-P, R-1-amino-2-propanol O-2-phosphate; PPi, pyrophosphate; α-R-P, α-ribazole-5′-phosphate; CbiB, putative AdoCbi-P synthase; CobU, ATP/GTP:AdoCbi kinase, GTP:AdoCbi-P guanylyltransferase; CobS, AdoCbl (5′-phosphate) synthase.
