ID 1.14.19.41 DE sterol 22-desaturase. CA 5-dehydroepisterol + H(+) + NADPH + O2 = ergosta-5,7,22,24(28)-tetraen- CA 3beta-ol + 2 H2O + NADP(+). CC -!- The enzyme, found in yeast and plants, catalyzes the introduction of CC a double bond between the C-22 and C-23 carbons of certain sterols. CC -!- In yeast the enzyme acts on ergosta-5,7,24(28)-trien-3beta-ol, a step CC in the biosynthesis of ergosterol. CC -!- The enzyme from the plant Arabidopsis thaliana acts on sitosterol and CC 24-epi-campesterol, producing stigmasterol and brassicasterol, CC respectively. DR O64697, C7101_ARATH; O64698, C7102_ARATH; Q9ZV29, C7103_ARATH; DR Q9ZV28, C7104_ARATH; Q1T7C2, C7111_SOLLC; I1RE80, ERG5A_GIBZE; DR A0A098DJ84, ERG5B_GIBZE; Q4WK25, ERG5_ASPFU ; G1UB11, ERG5_CANAL ; DR O13820, ERG5_SCHPO ; P54781, ERG5_YEAST ; //