| EC |
2.4.1.18 |
| Accepted name: |
1,4-α-glucan branching enzyme |
| Reaction: |
Transfers a segment of a (1→4)-α-D-glucan chain to a primary hydroxy group in a similar glucan chain |
| Other name(s): |
branching enzyme; amylo-(1,4→1,6)-transglycosylase; Q-enzyme; α-glucan-branching glycosyltransferase; amylose isomerase; enzymatic branching factor; branching glycosyltransferase; enzyme Q; glucosan transglycosylase; glycogen branching enzyme; plant branching enzyme; α-1,4-glucan:α-1,4-glucan-6-glycosyltransferase; starch branching enzyme; 1,4-α-D-glucan:1,4-α-D-glucan 6-α-D-(1,4-α-D-glucano)-transferase |
| Systematic name: |
(1→4)-α-D-glucan:(1→4)-α-D-glucan 6-α-D-[(1→4)-α-D-glucano]-transferase |
| Comments: |
Converts amylose into amylopectin. The accepted name requires a qualification depending on the product, glycogen or amylopectin, e.g. glycogen branching enzyme, amylopectin branching enzyme. The latter has frequently been termed Q-enzyme. |
| Links to other databases: |
BRENDA, EXPASY, Gene, KEGG, MetaCyc, PDB, CAS registry number: 9001-97-2 |
| References: |
| 1. |
Barker, S.A., Bourne, E. and Peat, S. The enzymic synthesis and degradation of starch. Part IV. The purification and storage of the Q-enzyme of the potato. J. Chem. Soc. (Lond.) (1949) 1705–1711. |
| 2. |
Baum, H. and Gilbert, G.A. A simple method for the preparation of crystalline potato phosphorylase and Q-enzyme. Nature 171 (1953) 983–984. [PMID: 13063502] |
| 3. |
Hehre, E.J. Enzymic synthesis of polysaccharides: a biological type of polymerization. Adv. Enzymol. Relat. Subj. Biochem. 11 (1951) 297–337. [PMID: 24540594] |
| 4. |
Illingworth Brown, B. and Brown, D.H. α-1,4-Glucan:α-1,4-glucan 6-glycosyltransferase from mammalian muscle. Methods Enzymol. 8 (1966) 395–403. |
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| [EC 2.4.1.18 created 1961] |
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