Identification of a Long-Chain Fatty Acid Elongase from Nannochloropsis sp. Involved in the Biosynthesis of Fatty Acids by Heterologous Expression in Saccharomyces cerevisiae

作者: Minrui Guo , Guogang Chen , Jiluan Chen , Minggang Zheng

DOI: 10.1007/S11802-019-3946-Y

关键词: BiochemistryAmino acidHeterologous expressionFatty acidBiosynthesisSaccharomyces cerevisiaeLinolenic acidLong chain fatty acidChemistryPolyunsaturated fatty acidOcean EngineeringOceanography

摘要: The marine microalga Nannochloropsis sp. contains various elongases and desaturases that are critical for biosynthesis of polyunsaturated fatty acids. A full-length cDNA encoding a long-chain acid elongase, named NsFAE, was cloned from sp.. open reading frame NsFAE (GenBank accession no. MF680548) consisted 1068bp encoded predicted protein 355 amino acids with molecular mass 38.8kDa. deduced polypeptide showed 43%-44% identity to acyl other algae. RT-PCR experiments indicated the gene exhibited highest expression in at 72h (i.e., during third growth stage) significantly lower four stages. Plasmid pNsFAE-CRISPR recombinant DNA fragment (ADH1p-NsFAE-CYCt) were transformed into Saccharomyces cerevisiae strain BY4742 using CRISPR-Cas system. Yeast transformants containing produced three not normally present wild-type BY4742-linoleic acid, linolenic eicosadienoic acid-indicating encodes functional elongase enzyme.

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