Abstract
Based on the chemical composition of the exopolysaccharide produced by the cystic fibrosis bacterial isolate Burkholderia cepacia IST408, we postulated and confirmed, based on the specificity of enzymes detected in crude cell-free extracts, the pathway leading to the presumptive activated sugar precursors: UDP-D-glucose, UDP-D-galactose, UDP-D-glucuronic acid, GDP-D-mannose, and GDP-D-rhamnose. Results also suggest that regulation of the expression of the mucoid phenotype in B. cepacia does not occur at the level of synthesis of any of these enzymes.
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