Product Pathways - Metabolism
Phospho-HSL (Ser660) Antibody #4126
|W IF-IC||M R||Endogenous||81, 83||Rabbit|
Reactivity Key: M=Mouse R=Rat
Species cross-reactivity is determined by western blot. Species enclosed in parentheses are predicted to react based on 100% sequence homology.
Specificity / Sensitivity
Phospho-HSL (Ser660) Antibody detects endogenous levels of HSL only when phosphorylated at Ser660 by PKA. This antibody does not cross-react with Ser563, Ser565 or Ser659 phosphorylated HSL.
Source / Purification
Polyclonal antibodies are produced by immunizing animals with a synthetic phosphopeptide corresponding to residues surrounding Ser651 of mouse HSL (equivalent to Ser660 of rat HSL). Antibodies are purified by protein A and peptide affinity chromatography.
Western blot analysis of extracts from differentiated NIH/3T3-L1 cells treated with isoproterenol, using Phospho-HSL (Ser660) Antibody.
HSL (hormone-sensitive lipase) catalyzes the hydrolysis of triacylglycerol, the rate-limiting step in lipolysis. Lipolytic stimuli activate adenylyl cyclase and thus increase intracellular cAMP levels, which in turn activate protein kinase A (PKA). PKA phosphorylates HSL at Ser563, Ser659 and Ser660, which stimulates HSL activity (1,2). In contrast, AMPK phosphorylates HSL at Ser565, which reduces HSL phosphorylation at Ser563 by PKA and inhibits HSL activity (2,3). Recent work indicates that phosphorylation at Ser600 by p44/42 MAPKs also enhances the enzymatic activity of HSL (4).
- Degerman, E. et al. (1990) Proc. Natl. Acad. Sci. USA 87, 533-537.
- Anthonsen, M.W. et al. (1998) J. Biol. Chem. 273, 215-221.
- Garton, A.J. and Yeaman, S.J. (1990) Eur. J. Biochem. 191, 245-250.
- Greenberg, A.S. et al. (2001) J. Biol. Chem. 276, 45456-45461.
- Aboulaich, N. et al. (2011) Diabetes 60, 757-65. Applications: Western Blotting
- Choi, S.M. et al. (2010) Mol Cell Biol , . Applications: Western Blotting
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For Research Use Only. Not For Use In Diagnostic Procedures.