Polygalacturonase is a pectinase: an enzyme that degrades pectin. PGs hydrolyze the O-glycosyl bonds in pectin’s polygalacturonan network, resulting in alpha-1,4-polygalacturonic residues.[11] The rate of hydrolysis is dependent on polysaccharide chain length. Low rates of hydrolysis are associated with very short chains (e.g. digalacturonic acid) and very long chains