Research Support, Non-U.S. Gov't
- Isolation and Functional Characterization of a Delta 6-Desaturase Gene from the Pike Eel (Muraenesox cinereus)
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Sun Hee Kim , Kyung Hee Roh , Jung-Bong Kim , Kwang-Soo Kim , Nam Shin Kim , Hyun Uk Kim , Kyeong-Ryeol Lee , Jong-Sug Park , Jong-Bum Kim
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J. Microbiol. 2013;51(6):807-813. Published online October 5, 2013
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DOI: https://doi.org/10.1007/s12275-013-3144-3
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Abstract
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Stearidonic acid (STA; 18:4n-3) and γ-linolenic acid (GLA;
18:3n-6) are significant intermediates in the biosynthetic pathway
for the very-long-chain polyunsaturated fatty acids of
eicosapentaenoic acid (EPA; 20:5n-3) and arachidonic acid
(ARA; 20:4n-6), respectively. To develop a sustainable system
for the production of dietary polyunsaturated fatty acids,
we focused on the action of the enzyme delta 6-desaturase
(D6DES) on the essential acids, linoleic acid (LA; 18:2n-6)
and α-linolenic acid (ALA; 18:3n-3). A 1,335-bp full-length
cDNA encoding D6DES (McD6DES) was cloned from Muraenesox
cinereus using degenerate PCR and RACE-PCR
methods
. To investigate the enzymatic activity of McD6DES
in the production of n-6 and n-3 fatty acids, a recombinant
plasmid expressing McD6DES (pYES-McD6DES) was transformed
into and expressed in Saccharomyces cerevisiae. The
exogenously expressed McD6DES produced GLA and STA
at conversion rates of 14.2% and 45.9%, respectively, from
the exogenous LA and ALA substrates. These results indicate
that McD6DES is essentially a delta 6-desaturase involved
in very-long-chain polyunsaturated fatty acid synthesis.
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Citations
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