Function
Catalyzes the stereospecific oxidation of squalene to (S)-2,3-epoxysqualene, and is considered to be a rate-limiting enzyme in steroid biosynthesis. Can produce not only oxidosqualene, but also 2,3:22,23-dioxidosqualene. Main squalene epoxidase in the root. Sqe1 mutants may show defects in membrane lipid rafts, impairing the correct localization of RHD2 NADPH oxidase and the proper polarized production of ROS.
Sequence
MESQLWNWILPLLISSLLISFVAFYGFFVKPKRNGLRHDRKTVSTVTSDVGSVNITGDTVADVIVVGAGVAGSALAYTLGKDKRRVHVIERDLSEPDRIVGELLQPGGYLKLLELGIEDCVEEIDAQRVYGYALFKNGKRIRLAYPLEKFHEDVSGRSFHNGRFIQRMREKAASLPNVQLEQGTVLSLLEENGTIKGVRYKNKAGEEQTAFAALTIVCDGCFSNLRRSLCNPQVEVPSCFVGLVLENCNLPYANHGHVVLADPSPILMYPISSTEVRCLVDVPGQKVPSIANGEMKNYLKTVVAPQMPHEVYDSFIAAVDKGNIKSMPNRSMPASPYPTPGALLMGDAFNMRHPLTGGGMTVALADIVVLRNLLRPLRDLSDGASLCKYLESFYTLRKPVAATINTLANALYQVFCSSENEARNEMREACFDYLGLGGMCTSGPVSLLSGLNPRPLTLVCHFFAVAVYGVIRLLIPFPSPKRIWLGAKLISGASGIIFPIIKAEGVRQMFFPATVPAYYYKAPTVGETKCS