ExplorEnz: EC 4.2.2.25

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4.2.2.25

Accepted name:

gellan lyase

Reaction:

Eliminative cleavage of β-D-glucopyranosyl-(1→4)-β-D-glucopyranosyluronate bonds of gellan backbone releasing tetrasaccharides containing a 4-deoxy-4,5-unsaturated D-glucopyranosyluronic acid at the non-reducing end. The tetrasaccharide produced from deacetylated gellan is β-D-4-deoxy-Δ⁴-GlcAp-(1→4)-β-D-Glcp-(1→4)-α-L-Rhap-(1→3)-β-D-Glcp.

Systematic name:

gellan β-D-glucopyranosyl-(1→4)-D-glucopyranosyluronate lyase

Comments:

The enzyme is highly specific to gellan, especially deacetylated gellan.

Links to other databases:

BRENDA, EXPASY, KEGG, MetaCyc

References:

1.	Hashimoto, W., Maesaka, K., Sato, N., Kimura, S., Yamamoto, K., Kumagai, H. and Murata, K. Microbial system for polysaccharide depolymerization: enzymatic route for gellan depolymerization by Bacillus sp. GL1. Arch. Biochem. Biophys. 339 (1997) 17–23. [DOI] [PMID: 9056228]
2.	Hashimoto, W., Sato, N., Kimura, S. and Murata, K. Polysaccharide lyase: molecular cloning of gellan lyase gene and formation of the lyase from a huge precursor protein in Bacillus sp. GL1. Arch. Biochem. Biophys. 354 (1998) 31–39. [DOI] [PMID: 9633595]
3.	Miyake, O., Kobayashi, E., Nankai, H., Hashimoto, W., Mikami, B. and Murata, K. Posttranslational processing of polysaccharide lyase: maturation route for gellan lyase in Bacillus sp. GL1. Arch. Biochem. Biophys. 422 (2004) 211–220. [DOI] [PMID: 14759609]

[EC 4.2.2.25 created 2011]