Reaction catalyzed by galacturonan 1,4-alpha-galacturonidase (3.2.1.67)

	[(1->4)-alpha-D-galacturonide]170	+		H2O	=		[(1->4)-alpha-D-galacturonide]169	+
	[(1->4)-alpha-D-galacturonide]170	+		H2O	=		[(1->4)-alpha-D-galacturonide]169	+		D-galacturonate