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Information on EC 1.14.19.38 - acyl-lipid DELTA6-acetylenase Please wait a moment until all data is loaded. This message will disappear when all data is loaded.
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The expected taxonomic range for this enzyme is: Ceratodon purpureus
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acyl-lipid DELTA6-acetylenase
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a gamma-linolenoyl-[glycerolipid] + 2 ferrocytochrome b5 + O2 + 2 H+ = a (9Z,12Z)-octadeca-9,12-dien-6-ynoyl-[glycerolipid] + 2 ferricytochrome b5 + 2 H2O
(1)
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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
(2)
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dicranin biosynthesis
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DELTA6 acyl-lipid,ferrocytochrome-b5:oxygen oxidoreductase (6,7-dehydrogenating)
The enzyme, characterized from the moss Ceratodon purpureus, converts the double bond at position 6 of gamma-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.
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DELTA6-fatty acyl desaturase
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brenda
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gamma-linolenoyl-[glycerolipid] + ferrocytochrome b5 + O2 + H+
(9Z,12Z)-octadeca-9,12-dien-6-ynoyl-[glycerolipid] + ferricytochrome b5 + H2O
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stearidonoyl-[glycerolipid] + ferrocytochrome b5 + O2 + H+
(9Z,12Z,15Z)-octadeca-9,12,15-trien-6-ynoyl-[glycerolipid] + ferricytochrome b5 + H2O
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additional information
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the bifunctional enzyme can introduce a DELTA6-cis-double bond into 9,12,(15)-C18-polyenoic acids as well as converting a DELTA6-cis-double bond to a DELTA6-triple bond
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gamma-linolenoyl-[glycerolipid] + ferrocytochrome b5 + O2 + H+
(9Z,12Z)-octadeca-9,12-dien-6-ynoyl-[glycerolipid] + ferricytochrome b5 + H2O
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stearidonoyl-[glycerolipid] + ferrocytochrome b5 + O2 + H+
(9Z,12Z,15Z)-octadeca-9,12,15-trien-6-ynoyl-[glycerolipid] + ferricytochrome b5 + H2O
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additional information
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the bifunctional enzyme can introduce a DELTA6-cis-double bond into 9,12,(15)-C18-polyenoic acids as well as converting a DELTA6-cis-double bond to a DELTA6-triple bond
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expressed in Saccharomyces cerevisiae strain InvSc1
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ACET6_CERPU
483
54858
Swiss-Prot
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Sperling, P.; Lee, M.; Girke, T.; Zaehringer, U.; Stymne, S.; Heinz, E.
A bifunctional delta-fatty acyl acetylenase/desaturase from the moss Ceratodon purpureus. A new member of the cytochrome b5 superfamily
Eur. J. Biochem.
267
3801-3811
2000
Ceratodon purpureus
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