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The acetan biosynthetic pathway in Acetobacter xylinum is an ideal model system for engineering novel bacterial polysaccharides. To genetically manipulate this pathway, an Acetobacter strain (CKE5), more susceptible to gene-transfer methodologies, was developed. A new gene, aceP, involved in acetan biosynthesis was identified, sequenced and shown to have homology at the amino acid level with beta-D-glucosyl transferases from a number of different organisms. Disruption of aceP in strain CKE5 confirmed the function assigned above and was used to engineer a novel polysaccharide with a pentasaccharide repeat unit.

Generation of a novel polysaccharide by inactivation of the aceP gene from the acetan biosynthetic pathway in Acetobacter xylinum