Involved in the biosynthesis of the polysaccharide xanthan. 30-40% of the terminal mannose residues of xanthan have a 4,6-O-(1-carboxyethan-1,1-diyl) ketal group. It also acts on the 6-O-acetyl derivative of the inner mannose unit.
Marzocca, M.P., Harding, N.E., Petroni, E.A., Cleary, J.M. and Ielpi, L. Location and cloning of the ketal pyruvate transferase gene of Xanthomonas campestris. J. Bacteriol.173 (1991) 7519–7524. [PMID: 1657892]