| EC |
3.2.1.89 |
| Accepted name: |
arabinogalactan endo-β-1,4-galactanase |
| Reaction: |
The enzyme specifically hydrolyses (1→4)-β-D-galactosidic linkages in type I arabinogalactans. |
| Other name(s): |
endo-1,4-β-galactanase; galactanase (ambiguous); arabinogalactanase; ganB (gene name) |
| Systematic name: |
arabinogalactan 4-β-D-galactanohydrolase |
| Comments: |
This enzyme, isolated from the bacterium Bacillus subtilis, hydrolyses the β(1→4) bonds found in type I plant arabinogalactans, which are a component of the primary cell walls of dicots. The predominant product is a tetrasaccharide. cf. EC 3.2.1.181, galactan endo-β-1,3-galactanase. |
| Links to other databases: |
BRENDA, EXPASY, Gene, KEGG, MetaCyc, PDB, CAS registry number: 58182-40-4 |
| References: |
| 1. |
Emi, S. and Yamamoto, T. Purification and properties of several galactanases of Bacillus subtilis var. amylosacchariticus. Agric. Biol. Chem. 36 (1972) 1945–1954. |
| 2. |
Labavitch, J.M., Freeman, L.E. and Albersheim, P. Structure of plant cell walls. Purification and characterization of a β-1,4-galactanase which degrades a structural component of the primary cell walls of dicots. J. Biol. Chem. 251 (1976) 5904–5910. [PMID: 823153] |
| 3. |
Shipkowski, S. and Brenchley, J.E. Bioinformatic, genetic, and biochemical evidence that some glycoside hydrolase family 42 β-galactosidases are arabinogalactan type I oligomer hydrolases. Appl. Environ. Microbiol. 72 (2006) 7730–7738. [DOI] [PMID: 17056685] |
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| [EC 3.2.1.89 created 1976, modified 2012] |
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