IUBMB Enzyme Nomenclature


Accepted name: pectin monosaccharide-lyase

Reaction: (1,4-α-D-galacturonosyl methyl ester)n = (1,4-α-D-galacturonosyl methyl ester)n-1 + 4-deoxy-6-O-methyl-L-threo-hex-4-enopyranuronate

Other name(s): exo-pectin lyase; PLIII

Systematic name: poly(1,4-α-D-galacturonosyl methyl ester) non-reducing-end-monosaccharide-lyase

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%.

Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc, CAS registry number:


1. Pedrolli, D.B. and Carmona, E.C. Purification and characterization of a unique pectin lyase from Aspergillus giganteus able to release unsaturated monogalacturonate during pectin degradation. Enzyme Res. 2014 (2014) 353915. [PMID: 25610636]

[EC created 2020]

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