Reaction catalyzed by endo-polygalacturonase (3.2.1.15)

		+		H2O	=			+
	alpha-D-galacturonosyl-(1,4)-O-alpha-D-galacturonosyl-(1,4)-O-alpha-D-galacturonosyl-(1,4)-O-alpha-D-galacturonosyl-(1,4)-O-alpha-D-galacturonate	+		H2O	=		alpha-D-galacturonosyl-(1,4)-O-alpha-D-galacturonosyl-(1,4)-O-alpha-D-galacturonate	+		alpha-D-galacturonosyl-(1,4)-O-alpha-D-galacturonate