Gellan tetrasaccharide unsaturated glucuronyl hydrolase (EC 3.2.1.179 UGL unsaturated glucuronyl hydrolase) is an enzyme with system name beta-D-4-deoxy-Delta4-GlcAp-(1->4)-beta-D-Glcp-(1->4)-alpha-L-Rhap-(1->3)-beta-D-Glcp beta-D-4-deoxy-Delta4-GlcAp hydrolase.