| EC |
5.4.99.17 |
| Accepted name: |
squalene—hopene cyclase |
| Reaction: |
squalene = hop-22(29)-ene |
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For diagram of hopene biosynthesis, click here |
| Systematic name: |
squalene mutase (cyclizing, hop-22(29)-ene-forming) |
| Comments: |
The enzyme also produces the cyclization product hopan-22-ol by addition of water (cf. EC 4.2.1.129, squalene—hopanol cyclase). Hopene and hopanol are formed at a constant ratio of 5:1. |
| Links to other databases: |
BRENDA, EXPASY, KEGG, MetaCyc, PDB, CAS registry number: 76600-69-6 |
| References: |
| 1. |
Hoshino, T. and Sato, T. Squalene-hopene cyclase: catalytic mechanism and substrate recognition. Chem. Commun. (2002) 291–301. [PMID: 12120044] |
| 2. |
Hoshino, T., Nakano, S., Kondo, T., Sato, T. and Miyoshi, A. Squalene-hopene cyclase: final deprotonation reaction, conformational analysis for the cyclization of (3R,S)-2,3-oxidosqualene and further evidence for the requirement of an isopropylidene moiety both for initiation of the polycyclization cascade and for the formation of the 5-membered E-ring. Org Biomol Chem 2 (2004) 1456–1470. [DOI] [PMID: 15136801] |
| 3. |
Sato, T., Kouda, M. and Hoshino, T. Site-directed mutagenesis experiments on the putative deprotonation site of squalene-hopene cyclase from Alicyclobacillus acidocaldarius. Biosci. Biotechnol. Biochem. 68 (2004) 728–738. [PMID: 15056909] |
| 4. |
Reinert, D.J., Balliano, G. and Schulz, G.E. Conversion of squalene to the pentacarbocyclic hopene. Chem. Biol. 11 (2004) 121–126. [DOI] [PMID: 15113001] |
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| [EC 5.4.99.17 created 2002, modified 2011] |
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