ⓘ Stearoyl-CoA 9-desaturase. In enzymology, a stearoyl-CoA 9-desaturase is an enzyme used to produce the monounsaturated fatty acid oleic acid from the saturated ..

                                     

ⓘ Stearoyl-CoA 9-desaturase

In enzymology, a stearoyl-CoA 9-desaturase is an enzyme used to produce the monounsaturated fatty acid oleic acid from the saturated fatty acid stearic acid. It catalyzes the chemical reaction

stearoyl-CoA + 2 ferrocytochrome b 5 + O 2 + 2 H + ⇌ {\displaystyle \rightleftharpoons } oleoyl-CoA + 2 ferricytochrome b 5 + 2 H 2 O

The 4 substrates of this enzyme are stearoyl-CoA, ferrocytochrome b5, O 2, and H +, whereas its 3 products are oleoyl-CoA, ferricytochrome b5, and H 2 O.

This enzyme belongs to the family of oxidoreductases, specifically those acting on paired donors, with O 2 as oxidant and incorporation or reduction of oxygen. The oxygen incorporated need not be derived from O 2 with oxidation of a pair of donors resulting in the reduction of to two molecules of water. The systematic name of this enzyme class is stearoyl-CoA,ferrocytochrome-b5:oxygen oxidoreductase 9.10-dehydrogenating. Other names in common use include Delta9-desaturase, acyl-CoA desaturase, fatty acid desaturase, and stearoyl-CoA, hydrogen-donor:oxygen oxidoreductase. This enzyme participates in polyunsaturated fatty acid biosynthesis and ppar signaling pathway. It employs one cofactor, iron.

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