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FEBS Lett. 2013 Feb 14;587(4):370-7. doi: 10.1016/j.febslet.2012.12.020. Epub 2013 Jan 10.

Lipid droplet synthesis is limited by acetate availability in starchless mutant of Chlamydomonas reinhardtii.

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1
Environmental Biotechnology Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon 305-806, Republic of Korea.

Abstract

Phenotypic and genotypic changes in Chlamydomonas reinhardtii BafJ5, a starchless mutant, with respect to lipid metabolism was studied in different trophic states under nitrogen (N) sufficient and limited conditions. Interestingly, cellular lipid content increased linearly with input acetate concentration with highest lipid content (∼42%) under nitrogen limitation and mixotrophic state. RT-qPCR studies indicate that key fatty acid biosynthesis genes are down-regulated under N limitation but not under mixotrophic state, whereas, ACS2, encoding Acetyl-CoA synthetase, and DGTT4, encoding Diacylglycerol O-acyltransferase, are up-regulated under all conditions. These results collectively indicate that acetate is the limiting factor and central molecule in lipid droplet synthesis. The study also provides further evidence of the presence of a chloroplast pathway for triacylglycerol synthesis in microalgae.

PMID:
23313852
DOI:
10.1016/j.febslet.2012.12.020
[Indexed for MEDLINE]
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