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https://hdl.handle.net/2440/60313
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Type: | Journal article |
Title: | Cloning and functional characterisation of a fatty acyl elongase from southern bluefin tuna (Thunnus maccoyii) |
Author: | Gregory, M. See, V. Gibson, R. Schuller, K. |
Citation: | Comparative Biochemistry and Physiology B: Biochemistry and Molecular Biology, 2010; 155(2):178-185 |
Publisher: | Elsevier Inc. |
Issue Date: | 2010 |
ISSN: | 1096-4959 1879-1107 |
Statement of Responsibility: | Melissa K. Gregory, Valene H.L. See, Robert A. Gibson and Kathryn A. Schuller |
Abstract: | The synthesis of long chain polyunsaturated fatty acids (LCPUFA), such as eicosapentaenoic acid (EPA; 20:5n-3) and docosahexaenoic acid (DHA; 22:6n-3), involves fatty acyl desaturase and elongase enzymes. The marine fish species southern bluefin tuna (SBT) can accumulate large quantities of omega-3 (n-3) LCPUFA in its flesh but their capacity to synthesize EPA and DHA is uncertain. A cDNA, sbtElovl5, encoding a putative fatty acyl elongase was amplified from SBT liver tissue. The cDNA included an open reading frame (ORF) encoding 294 amino acids. Sequence comparisons and phylogenetic analyses revealed a high level of sequence conservation between sbtElovl5 and fatty acyl elongase sequences from other fish species. Heterologous expression of the sbtElovl5 ORF in Saccharomyces cerevisiae confirmed that it encoded a fatty acyl elongase capable of elongating C(18/20) polyunsaturated fatty acid (PUFA) substrates, but not C(22) PUFA substrates. For the first time in an Elovl5, the substrate competition occurring in nature was investigated. Higher activity towards n-3 PUFA substrates than omega-6 (n-6) PUFA substrates was exhibited, regardless of substrate chain length. The sbtElovl5 preferentially elongated 18:4n-3 and 18:3n-6 rather than 20:5n-3 and 20:4n-6. The sbtElovl5 enzyme also elongated saturated and monounsaturated fatty acids. |
Keywords: | Aquaculture cDNA Fatty acyl elongase Long chain polyunsaturated fatty acids Southern bluefin tuna Yeast expression |
Rights: | Crown copyright © 2009 Published by Elsevier Inc. |
DOI: | 10.1016/j.cbpb.2009.11.002 |
Published version: | http://dx.doi.org/10.1016/j.cbpb.2009.11.002 |
Appears in Collections: | Agriculture, Food and Wine publications Aurora harvest 5 |
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