Squalene-hopene cyclase, EC:5.4.99.17, catalyzes the cyclisation of squalene into hopene in bacteria. This reaction is part of a cationic cyclisation cascade, which is homologous to a key step in cholesterol biosynthesis. This family is the C-terminal half of the molecule.
Jiyao W et al.(2023). "The conserved domain database in 2023.",