Accepted name: squalene—hopanol cyclase
Reaction: hopan-22-ol = squalene + H2O
Other name(s): squalene—hopene cyclase (ambiguous)
Systematic name: hopan-22-ol hydro-lyase
Comments: The enzyme produces the cyclization products hopene (cf. EC and hopanol from squalene at a constant ratio of 5:1.
1.  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. [PMID: 15136801]
2.  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]
[EC created 2011]