Abstract
A cluster of genes for diutan polysaccharide synthesis was isolated from a library of Sphingomonas sp. ATCC 53159 genomic DNA by complementation of glucosyl-isoprenylphosphate transferase-deficient mutants of Sphingomonas elodea ATCC 31461 (producing gellan) and Xanthomonas campestris (producing xanthan). The synthesis of polysaccharide in these strains shares a common first step, transfer of glucose-1-phosphate from UDP-glucose to the isoprenylphosphate lipid. The cluster of 24 genes was compared to genes for biosynthesis of gellan, and S-88 sphingan from Sphingomonas sp. ATCC 31554. Diutan, gellan and S-88 sphingan have a common four-sugar backbone but different side chains, one rhamnose for S-88 sphingan, a two-rhamnose side chain for diutan and no side chain for gellan. The genes for biosynthesis of diutan, gellan and S-88 sphingan were similar in general organization but differed in location of some genes, in particular, dpsG (putative polymerase), dpsR (putative lyase) and dpsS (putative repeat unit transporter). An unidentified reading frame urf31, present in the gene clusters for diutan and S-88 sphingan but not gellan, had similarity to glycosyl transferase group 2 proteins, and was detrimental when cloned in Sphingomo...Continue Reading
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