ID   4.2.99.25
DE   unsaturated pyranuronate lyase.
CA   (1) 4-deoxy-L-erythro-hex-4-enopyranuronate = (4S,5S)-4,5-dihydroxy-2,6-
CA   dioxohexanoate.
CA   (2) 4-deoxy-L-threo-hex-4-enopyranuronate = 5-dehydro-4-deoxy-D-
CA   glucuronate.
CC   -!- The enzyme, found in bacteria and archaea, is involved in the
CC       degradation of polysaccharides such as alginate and pectin.
CC   -!- The enzyme catalyzes a pyranose ring-opening reaction followed by
CC       enol-keto tautomerization.
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