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Information on EC - DELTA7-sterol 5(6)-desaturase

for references in articles please use BRENDA:EC1.14.19.20
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IUBMB Comments
This enzyme, found in eukaryotic organisms, catalyses the introduction of a double bond between the C5 and C6 carbons of the B ring of Delta7-sterols, to yield the corresponding Delta5,7-sterols. The enzymes from yeast, plants and vertebrates act on avenasterol, episterol, and lathosterol, respectively. The enzyme is located at the endoplasmic reticulum and is membrane bound.
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The enzyme appears in viruses and cellular organisms
5-DES, 5alpha-cholest-7-en-3beta-ol:oxygen DELTA5-oxidoreductase, C-5 sterol desaturase, C-5(6) sterol desaturase, Delta-7-sterol 5-desaturase, DELTA7-sterol 5-desaturase, DELTA7-sterol C56-desaturase, DELTA7-sterol DELTA5-dehydrogenase, DELTA7-sterol-C-5-desaturase, DELTA7-sterol-C5 (6)-desaturase, more
a DELTA7-sterol + 2 ferrocytochrome b5 + O2 + 2 H+ = a DELTA5,7-sterol + 2 ferricytochrome b5 + 2 H2O
show the reaction diagram