catalytic activity:2 farnesyl diphosphate = diphosphate + presqualene diphosphate.,catalytic activity:Presqualene diphosphate + NAD(P)H = squalene + diphosphate + NAD(P)(+).,cofactor:Magnesium.,pathway:Terpene metabolism; lanosterol biosynthesis; lanosterol from farnesyl-PP: step 1/3.,similarity:Belongs to the phytoene/squalene synthetase family.,subunit:Monomer.,
Endoplasmic reticulum membrane ; Multi-pass membrane protein .
Widely expressed.