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EC 1.14.19.17 Details
EC number
1.14.19.17
Accepted name
sphingolipid 4-desaturase
Reaction
a dihydroceramide + 2 ferrocytochrome b5 + O2 + 2 H+ = a (4E)-sphing-4-enine ceramide + 2 ferricytochrome b5 + 2 H2O
Other name(s)
dehydroceramide desaturase
Systematic name
dihydroceramide,ferrocytochrome b5:oxygen oxidoreductase (4,5-dehydrogenating)
Comment
The enzyme, which has been characterized from plants, fungi, and mammals, generates a trans double bond at position 4 of sphinganine bases in sphingolipids [1]. The preferred substrate is dihydroceramide, but the enzyme is also active with dihydroglucosylceramide [2]. Unlike EC 1.14.19.29, sphingolipid 8-desaturase, this enzyme does not contain an integral cytochrome b5 domain [4] and requires an external cytochrome b5 [3]. The product serves as an important signalling molecules in mammals and is required for spermatide differentiation [5].
History
created 2015
EC Tree
1.14.99.5 created 1972, modified 1986, modified 2000, deleted 2000
1.14.99.6 created 1972, modified 2000, deleted 2000
1.14.99.8 created 1972, deleted 1984
1.14.99.13 created 1972, deleted 1984
1.14.99.16 created 1972, deleted 2002
1.14.99.17 created 1972, deleted 1976
1.14.99.18 created 1976, modified 1999, deleted 2003
1.14.99.25 created 1986, deleted 2000