期刊
ALGAL RESEARCH-BIOMASS BIOFUELS AND BIOPRODUCTS
卷 26, 期 -, 页码 215-224出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.algal.2017.07.028
关键词
P. tricornutum; Lipid accumulation; Lipid droplets; LD proteome; Gene knockdown; Overexpression
资金
- National Natural Science Foundation of China [41576132, 41576123, 41206126]
- Guangdong Natural Science Foundation [2014A030308010, 2015A030313326, S2013010013406]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDA11020304]
Lipid droplets (LDs) are lipid monolayer-enclosed organelles comprising a lipid core and surface associatedproteins. However, the protein components and their regulatory functions in LDs have remained largely unknown in oleaginous diatoms. In this study, we identified a gene encoding lipid droplet (LD)-associated protein (PtLDP1) in Phaeodactylum tricornutum and examined its function. The PtLDP1 showed homology to the diatomoleosome-associated protein 1 (DOAP1) from Fistulifera. Overexpression of the PtLDP1 gene elevated lipid content, enlarged LD size and increased relative expression levels of key genes involved in triacylglycerol (TAG) and fatty acid biosynthesis. In contrast, knockdown of PtLDP1 by RNAi decreased lipid and TAG content, and subsequently reduced LD size. In addition, LDs were isolated from P. tricornutum cells and the proteome of LDs was identified by mass spectrometry. We found that PtLDP1 was a significant protein in the LD proteome. Importantly, labeling of enhanced yellow fluorescent protein (EYFP) confirmed that the PtLDP1 was localized to the LDs. Altogether, our data suggest that the PtLDP1 could be an important LD-associated protein contributing to regulation of TAG synthesis and lipogenesis. The findings will provide new targets for genetic improvement of oleaginous microalgae.
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