期刊
ARCHIVES OF BIOCHEMISTRY AND BIOPHYSICS
卷 473, 期 1, 页码 42-47出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.abb.2008.02.036
关键词
Lsd; lipolysis; lipid droplets; PAT-protein; TG-lipase; TGL; phosphorylation; PKA; fat body; AKH
资金
- NIGMS NIH HHS [GM 64677, R01 GM064677-05, R01 GM064677] Funding Source: Medline
Triglycericles (TG) stored in lipid droplets (LDs) are the main energy reserve in all animals. The mechanism by which animals mobilize TG is complex and not fully understood. Several proteins surrounding the LDs have been implicated in TG homeostasis such as mammalian perilipin A and insect lipid storage proteins (Lsd). Most of the knowledge on LD-associated proteins comes from studies using cells or LDs leaving biochemical properties of these proteins uncharacterized. Here we describe the purification of recombinant Lsd1 and its reconstitution with lipids to form lipoprotein complexes suitable for functional and structural studies. Lsd1 in the lipid bound state is a predominately alpha-helical protein. Using lipoprotein complexes containing triolein it is shown that PKA mediated phosphorylation of Lsd1 promoted a 1.7-fold activation of the main fat body lipase demonstrating the direct link between Lsd I phosphorylation and activation of lipolysis. Serine 20 was identified as the Lsd1 -phosphorylation site triggering this effect. (c) 2008 Elsevier Inc. All rights reserved.
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