Identification of a cDNA encoding a novel C18-delta9 polyunsaturated fatty acid-specific elongating activity from the docosahexaenoic acid (DHA)-producing microalga, Isochrysis galbana

A - Papers appearing in refereed journals

Qi, B., Beaudoin, F., Fraser, T., Stobart, A. K., Napier, J. A. and Lazarus, C. M. 2002. Identification of a cDNA encoding a novel C18-delta9 polyunsaturated fatty acid-specific elongating activity from the docosahexaenoic acid (DHA)-producing microalga, Isochrysis galbana. FEBS Letters. 510 (3), pp. 159-165.

AuthorsQi, B., Beaudoin, F., Fraser, T., Stobart, A. K., Napier, J. A. and Lazarus, C. M.
Abstract

Isochrysis galbana, a marine prymnesiophyte microalga, is rich in long chain polyunsaturated fatty acids such as docosahexaenoic acid (C22:6n-3, Delta(4,7,10,13,16,19)). We used a polymerase chain reaction-based strategy to isolate a cDNA, designated IgASE1, encoding a polyunsaturated fatty acid-elongating activity from L galbana. The coding region of 263 amino acids predicts a protein of 30 kDa that shares only limited homology to animal and fungal proteins with elongating activity. Functional analysis of IgASE1, by expression in Saccharomyces cerevisiae, was used to determine its activity and substrate specificity. Transformed yeast cells specifically elongated the C18-Delta(9) polyunsaturated fatty acids, linoleic acid (C18:2n-6, Delta())(9,12) and alpha-linolenic acid (C18:3n-3, Delta(9,12,15)), to eicosadienoic acid (C20:2n-6, Delta(11,14)) and eicosatrienoic acid (C20:3n-3, Delta(11,14,17)), respectively. To our knowledge this is the first time such an elongating activity has been functionally characterised. The results also suggest that a major route for eicosapentaenoic acid (C20:5n-3, Delta(1,8,11,14,17)) and docosahexaenoic acid syntheses in L galbana may involve a Delta(8) desaturation pathway. (C) 2002 Federation of European Biochemical Societies. Published by Elsevier Science B.V. All rights reserved.

KeywordsBiochemistry & Molecular Biology; Biophysics; Cell Biology
Year of Publication2002
JournalFEBS Letters
Journal citation510 (3), pp. 159-165
Digital Object Identifier (DOI)doi:10.1016/S0014-5793(01)03247-1
PubMed ID11801246
Open accessPublished as non-open access
FunderBiotechnology and Biological Sciences Research Council
Funder project or code415
503
ISSN00145793
PublisherWiley
Grant IDBBS/E/C/00004156

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