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Information on EC 4.2.2.27 - pectin monosaccharide-lyase

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EC Tree
     4 Lyases
         4.2 Carbon-oxygen lyases
             4.2.2 Acting on polysaccharides
                4.2.2.27 pectin monosaccharide-lyase
IUBMB Comments
The enzyme, isolated from the fungus Aspergillus giganteus, acts on the non-reducing end of methyl-esterified polygalacturonan, releasing either 4-deoxy--L-threo-hex-4-enopyranuronate or 4-deoxy-6-O-methyl-L-threo-hex-4-enopyranuronate. The enzyme is stimulated by divalent cations, with Co2+ having the strongest effect. It is able to act on substrates as short as a disaccharide, and was active on substrates with degrees of methyl esterification ranging between 34% and 90%.
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The expected taxonomic range for this enzyme is: Aspergillus giganteus
Reaction Schemes
(1,4-alpha-D-galacturonosyl methyl ester)n
=
(1,4-alpha-D-galacturonosyl methyl ester)n-1
+
4-deoxy-6-O-methyl-L-threo-hex-4-enopyranuronate
Synonyms
exo-pectin lyase, PLIII, more
REACTION
REACTION DIAGRAM
COMMENTARY hide
ORGANISM
UNIPROT
LITERATURE
(1,4-alpha-D-galacturonosyl methyl ester)n = (1,4-alpha-D-galacturonosyl methyl ester)n-1 + 4-deoxy-6-O-methyl-L-threo-hex-4-enopyranuronate
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