Abstract
Diacylglycerol acyltransferase (DGAT) plays a pivotal role in triacylglycerol (TAG) formation in some oleaginous organisms. We describe here the identification of a type 2 DGAT (PtDGAT2B) in the diatom Phaeodactylum tricornutum that contains four putative type 2 acyl-CoA:DGATs, sharing little sequence similarity with each other. TAG synthesis and lipid body formation could be completely restored in a Saccharomyces cerevisiae TAG-deficient quadruple mutant by expressing PtDGAT2B. Up-regulation of PtDGAT2B precedes the accumulation of TAG. Functional analysis of enzyme activity in vivo demonstrated that expression of PtDGAT2B can increase the proportion of unsaturated C16 and C18 fatty acids in yeast TAG.
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