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We isolated two galactosamine derivatives from Bacillus megaterium sporulating cells by lectin affinity chromatography followed by DEAE-Sephadex A-25 chromatography. From chemical analyses and measurements of these compounds, it was determined that one was uridine 5'-diphospho-N-acetylgalactosamine and that the other was uridine 5'-diphosphogalactosamine. They appeared in the middle stage of sporulation and disappeared during the period when galactosamine-6-phosphate is deposited on the forespore surface. These results suggest that uridine 5'-diphospho-N-acetylgalactosamine and uridine 5'-diphosphogalactosamine are intermediates in the biosynthesis of the galactosamine-6-phosphate polymer, a backbone structure of the exosporium.

journal of bacteriology

Occurrence in Bacillus megaterium of uridine 5'-diphospho-N-acetylgalactosamine and uridine 5'-diphosphogalactosamine, intermediates in the biosynthesis of galactosamine-6-phosphate polymer