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Information on EC - sphingolipid 8-(E)-desaturase

for references in articles please use BRENDA:EC1.14.19.18
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IUBMB Comments
The enzyme, characterized from the yeasts Kluyveromyces lactis and Candida albicans and from the diatom Thalassiosira pseudonana , introduces a trans double bond at the 8-position of sphingoid bases in sphingolipids. The enzyme determines the position of the double bond by its distance from the alcohol end of the sphingoid base, and contains a cytochrome b5 domain that acts as the direct electron donor to the active site of the desaturase . The homologous enzymes from higher plants, EC, sphingolipid 8-(E/Z)-desaturase, act on phytosphinganine (4-hydroxysphinganine) and produces a mixture of trans and cis isomers.
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The enzyme appears in viruses and cellular organisms
8 fatty acid desaturase, 8-sphingolipid desaturase, D8A, D8B, D8C, D8D, DELTA8-sphingolipid desaturase, DesB, SLD, sphinganine DELTA8-desaturase, more
a (4E)-sphing-4-enine ceramide + 2 ferrocytochrome b5 + O2 + 2 H+ = a (4E,8E)-sphing-4,8-dienine ceramide + 2 ferricytochrome b5 + 2 H2O
show the reaction diagram
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