Functional characterization, tissue distribution and nutritional regulation of the Elovl4 gene in golden pompano, Trachinotus ovatus (Linnaeus, 1758)
文献类型： 外文期刊
作者： Zhu, Ke-Cheng 1 ; Song, Ling 1 ; Liu, Bao-Suo 1 ; Guo, Hua-Yang 1 ; Zhang, Nan 1 ; Guo, Liang 1 ; Jiang, Shi-Gui 1 ; Zhan 1 ;
作者机构： 1.Chinese Acad Fishery Sci, South China Sea Fisheries Res Inst, Key Lab South China Sea Fishery Resources Exploit, Minist Agr & Rural Affairs, 231 Xingang Rd West, Guangzhou 510300, Guangdong, Peoples R China
2.Chinese Acad Fishery Sci, Trop Aquaculture Res & Dev Ctr, South China Sea Fisheries Res Inst, Sanya 572018, Peoples R China
3.Guangdong Prov Engineer Technol Res Ctr Marine Bi, Guangzhou 510300, Guangdong, Peoples R China
4.Sanya Trop Fisheries Res Inst, Sanya 572018, Hainan, Peoples R China
关键词： Trachinotus ovatus; Elovl4b; Heterologous expression; Nutritional regulation
期刊名称：GENE （ 影响因子：3.688； 五年影响因子：3.329 ）
ISSN： 0378-1119
年卷期： 2021 年 766 卷
页码：
收录情况： SCI
摘要： The elongases of very long-chain fatty acids (Elovls) are involved in the rate-limiting of the carbon chain elongation reaction in fatty acid (FA) biosynthesis in vertebrates. One member of the Elovls family, Elovl4, has been regarded as a critical enzyme involved in the biosynthesis pathway of polyunsaturated fatty acids (PUFAs). To explore the role of Elovl4 in PUFA synthesis in Trachinotus ovatus, the cDNA of the Elovl4b gene is cloned from T. ovatus (ToElovl4b). The ORF of ToElovl4b was 918 bp and encoded 305 amino acid (aa) protein sequences. Sequence alignment showed that the deduced amino acids contained significant structural features of the Elovl4 family, such as a histidine box motif (HXXHH), multiple transmembrane domains and an endoplasmic reticulum (ER) retention signal. Moreover, phylogenetic analysis revealed that ToElovl4b was highly conserved with that of Rachycentron canadum Elovl4b. Moreover, heterologous expression in yeast demonstrated that ToElovl4b could efficiently elongate 18:2n-6, 18:3n-6 and 20:5n-3 FAs up to 20:2n-6, 20:3n-6 and 22:5n-3, respectively. Furthermore, the tissue expression profile indicated that mRNA expression of ToElovl4b was higher in the gonads and brain than in other tissues. Additionally, nutritional regulation suggested the highest mRNA levels of ToElovl4b in liver and brain were under feeding with 1:1 FO-SO (fish oil, FO; soybean oil, SO) and 1:1 FO-CO (corn oil, CO)), respectively. These new insights were useful for understanding the molecular basis and regulation of LC-PUFA biosynthesis in fish.
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