Summary: mutants (deficient in succinoglycan or EPS I synthesis) were characterized. The defect was determined to be the lack of UDP-glucose 4-epimerase (EC activity. This defect results in absence of UDP-galactose, which is the obligatory intermediate as galactose donor for initiation of the succinoglycan repeating unit on a lipid intermediate. It was determined that does not have the Leloir pathway enzyme activities galactokinase (EC and galactose-1-phosphate uridylyltransferase (EC A De Ley-Doudoroff oxidative pathway for galactose metabolism was observed in This pathway is not constitutive and its expression required D-galactose or L-arabinose. However, UDP-glucose 4-epimerase is constitutive and did not require growth on galactose for full expression.


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