Journal
AQUACULTURE
Volume 479, Issue -, Pages 208-216Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.aquaculture.2017.05.041
Keywords
Chu's croaker; Delta 6 Fatty acyl desaturase; Cloning; Tissue distribution; Functional characterization; Nutritional regulation
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Funding
- young creative talents, major scientific research projects of Guangdong University Foundation [2016KQNCX058]
- China Guangdong Oceanic and Fishery Science and Technology Foundation [A201005D06-1]
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In the present study, we successfully cloned the full-length cDNA of a Delta 6 fatty acyl desaturase (Delta 6 Fad) of chu's croaker Nibea coibor. The cloned cDNA sequence was 1590 bp at full length, including a 5'-UTR of 137 bp, a 3'-UTR of 115 bp and a mean ORF of 1338 bp that specified a peptide of 445 aa. Sequence analysis of the deduced polypeptide showed that it contained all the characteristics of Delta 6 Fad identified such as one cytochrome b(5) domain, three trans-membrane regions and three histidine-rich boxes. Tissue distribution revealed that it strongly expressed in brain, significantly high than the level in eye, spleen, intestine, heart, gill, liver, stomach, muscle, liver and kidney. Functional characterization by heterologous expression in yeast showed that the chu's croaker desaturase was a Fad2 with Delta 6 Fad activity, with 9.36% conversion of 18: 2n-6 to 18: 3n-6 and 4.93% of 18: 3n-3 to 18: 4n-3, respectively. Nutritional study showed that the expression of Delta 6 Fad in liver were not significantly affected among treatments.
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