Please use this identifier to cite or link to this item: http://hdl.handle.net/1893/25391
Appears in Collections:Aquaculture Journal Articles
Peer Review Status: Refereed
Title: Functional characterization and differential nutritional regulation of putative Elovl5 and Elovl4 elongases in large yellow croaker (Larimichthys crocea)
Authors: Li, Songlin
Monroig, Oscar
Wang, Tianjiao
Yuan, Yuhui
Navarro, Juan C
Hontoria, Francisco
Liao, Kai
Tocher, Douglas R
Mai, Kangsen
Xu, Wei
Ai, Qinghui
Contact Email: om5@stir.ac.uk
Keywords: aquaculture
elongation of very long-chain fatty acid protein
large yellow croaker
biosynthesis
Issue Date: 23-May-2017
Citation: Li S, Monroig O, Wang T, Yuan Y, Navarro JC, Hontoria F, Liao K, Tocher DR, Mai K, Xu W & Ai Q (2017) Functional characterization and differential nutritional regulation of putative Elovl5 and Elovl4 elongases in large yellow croaker (Larimichthys crocea), Scientific Reports, 7, Art. No.: 2303.
Abstract: In the present study, two elongases, Elovl4 and Elovl5, were functionally characterized and their transcriptional regulation in response to n-3 LC-PUFA administration were investigated in vivo and in vitro. We previously described the molecular characterization of croaker elovl5. Here, we report the full- length cDNA sequence of croaker elovl4, which contained 1794 bp (excluding the polyA tail), including 909 bp of coding region that encoded a polypeptide of 302 amino acids possessing all the characteristic features of Elovl proteins. Functional studies showed that croaker Elovl5, displayed high elongation activity towards C18 and C20 PUFA, with only low activity towards C22 PUFA. In contrast, croaker Elovl4 could e ectively convert both C20 and C22 PUFA to longer polyenoic products up to C34. n-3 LC-PUFA suppressed transcription of the two elongase genes, as well as srebp-1 and lxrα, major regulators of hepatic lipid metabolism. The results of dual-luciferase reporter assays and in vitro studies both indicated that the transcriptions of elovl5 and elovl4 elongases could be regulated by Lxrα. Moreover, Lxrα could mediate the transcription of elovl4 directly or indirectly through regulating the transcription of srebp-1. The above ndings contribute further insight and understanding of the mechanisms regulating LC-PUFA biosynthesis in marine sh species.
DOI Link: http://dx.doi.org/10.1038/s41598-017-02646-8
Rights: Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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