Pectate trisaccharide-lyase (, exopectate-lyase, pectate lyase A, PelA) is an enzyme with systematic name (1→4)-α-D-galacturonan reducing-end-trisaccharide-lyase. This enzyme catalyses the following chemical reaction:
eliminative cleavage of unsaturated trigalacturonate as the major product from the reducing end of polygalacturonic acid/pectate
The predominant action of this enzyme is removal of a trisaccharide.
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