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EC 1.14.19.30 Details
show Brenda entryEC number
1.14.19.30
Accepted name
acyl-lipid (8-3)-desaturase
Reaction
(1) an (8Z,11Z,14Z)-icosa-8,11,14-trienoyl-[glycerolipid] + 2 ferrocytochrome b5 + O2 + 2 H+ = a (5Z,8Z,11Z,14Z)-icosatetra-5,8,11,14-tetraenoyl-[glycerolipid] + 2 ferricytochrome b5 + 2 H2O;;(2) an (8Z,11Z,14Z,17Z)-icosa-8,11,14,17-tetraenoyl-[glycerolipid] + 2 ferrocytochrome b5 + O2 + 2 H+ = a (5Z,8Z,11Z,14Z,17Z)-icosa-5,8,11,14,17-pentaenoyl-[glycerolipid] + 2 ferricytochrome b5 + 2 H2O
Other name(s)
acyl-lipid 5-desaturase,
Δ5-fatty-acid desaturase,
DES5 (gene name),
D5des (gene name),
FADS1
Systematic name
Δ8 acyl-lipid,ferrocytochrome b5:oxygen oxidoreductase (5,6 cis-dehydrogenating)
Comment
The enzyme, which has been characterized from multiple organisms including the moss Physcomitrella patens, the marine microalga Rebecca salina, and the filamentous fungus Mortierella alpina, introduces a cis double bond at the 5-position in 20-carbon polyunsaturated fatty acids incorporated in a glycerolipid that contain a Δ8 double bond. The enzyme contains a cytochrome b5 domain that acts as the direct electron donor to the active site of the desaturase, and does not require an external cytochrome.
History
created 2015
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1 Oxidoreductases
1.1 Acting on the CH-OH group of donors
1.4.99.1 D-amino-acid dehydrogenase
