1.14.19.29: sphingolipid 8-(E/Z)-desaturase
This is an abbreviated version!
For detailed information about sphingolipid 8-(E/Z)-desaturase, go to the full flat file.
Reaction
+ 2 ferrocytochrome b5 + + 2 H+ = + 2 ferricytochrome b5 + 2 H2O
Synonyms
8 fatty acid desaturase, 8-sphingolipid desaturase, D8A, D8B, D8C, D8D, DELTA8 Des, Delta8 sphingolipid desaturase, DELTA8(E,Z)-sphingolipid desaturase, Delta8-fatty-acid desaturase 1, Delta8-fatty-acid desaturase 2, DELTA8-sphingolipid desaturase, Delta8-sphingolipid desaturase 1, Delta8-sphingolipid desaturase 2, Delta8-sphingolipid desaturase 3, DELTA8-sphingolipid-desaturase, DES8, DXDES, LCB DELTA8 desaturase, PtD8A, PtD8B, PtD8C, SLD, SLD1, SLD2, sphingoid long-chain base DELTA8 desaturase, sphingolipid DELTA8-desaturase
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Systematic Name
Systematic Name on EC 1.14.19.29 - sphingolipid 8-(E/Z)-desaturase
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(4R)-4-hydroxysphinganine ceramide,ferrocytochrome b5:oxygen oxidoreductase (8,9 cis/trans-dehydrogenating)
The enzymes from higher plants convert sphinganine, 4E-sphing-4-enine and phytosphinganine into E/Z-mixtures of Delta8-desaturated products displaying different proportions of geometrical isomers depending on plant species. The nature of the actual desaturase substrate has not yet been studied experimentally. The enzymes contain an N-terminal cytochrome b5 domain that acts as the direct electron donor to the active site of the desaturase [1]. The homologous enzymes from some yeasts and diatoms, EC 1.14.19.18, sphingolipid 8-(E)-desaturase, act on sphing-4-enine ceramides and produce only the trans isomer.