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EC 1.14.19.38 Details
show Brenda entryEC number
1.14.19.38
Accepted name
acyl-lipid Δ6-acetylenase
Reaction
(1) a γ-linolenoyl-[glycerolipid] + 2 ferrocytochrome b5 + O2 + 2 H+ = a (9Z,12Z)-octadeca-9,12-dien-6-ynoyl-[glycerolipid] + 2 ferricytochrome b5 + 2 H2O;;(2) a stearidonoyl-[glycerolipid] + 2 ferrocytochrome b5 + O2 + 2 H+ = a (9Z,12Z,15Z)-octadeca-9,12,15-trien-6-ynoyl-[glycerolipid] + 2 ferricytochrome b5 + 2 H2O
Systematic name
Δ6 acyl-lipid,ferrocytochrome-b5:oxygen oxidoreductase (6,7-dehydrogenating)
Comment
The enzyme, characterized from the moss Ceratodon purpureus, converts the double bond at position 6 of γ-linolenate and stearidonate into a triple bond. The product of the latter, dicranin, is the main fatty acid found in C. purpureus. The enzyme contains a cytochrome b5 domain that acts as the direct electron donor to the desaturase active site. The enzyme also has the activity of EC 1.14.19.47, acyl-lipid (9-3)-desaturase.
History
created 2015
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1 Oxidoreductases
1.1 Acting on the CH-OH group of donors
1.14.1.2 created 1965, deleted 1972 1.14.1.4 created 1965, deleted 1972 1.14.1.5 created 1965, deleted 1972 1.14.1.7 created 1965, deleted 1972 1.14.1.8 created 1965, deleted 1972 1.14.1.9 created 1965, deleted 1972 1.14.1.10 created 1965, deleted 1972 1.14.1.11 created 1965, deleted 1972
