This entry represents a group of enzymes involved in the steroid biosynthetic pathway, including 7-dehydrocholesterol reductase and Delta(14)-sterol reductase LBR (lamin B receptor) from animals [, , ], Delta(14)-sterol reductase from fungi and plants [, , ]and Delta(24(24(1)))-sterol reductase from yeast []. These proteins act by reducing double bonds in precursors of ergosterol, are highly hydrophobic and seem to contain seven or eight transmembrane regions.
