Pectinase's a general term for enzymes that break down pectin, a polysaccharide substrate that's found in the cell walls of plants. One of the most studied and widely used commercial pectinases's polygalacturonase. It's useful because pectin's the jelly-like matrix which helps cement plant cells together and in which other cell wall components, such as cellulose fibrils, are embedded. Therefore pectinase enzymes are commonly used in processes involving the degradation of plant materials, such as… (More on Pectinase)