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Papers In Press, published online ahead of print August 22, 2003
Biochemistry, Molecular Biology and Biophysics, University of Minnesota, Minneapolis, MN 55455
Corresponding Author: bernl001{at}umn.edu
Fatty acid transport protein 1 (FATP1) is an ~63 kDa plasma membrane protein that facilitates the influx of fatty acids into adipocytes as well as skeletal and cardiac myocytes. Previous studies with FATP1 expressed in COS1 cell extracts suggested that FATP1 exhibits very long chain acyl CoA synthetase activity and that such activity may be linked to fatty acid transport. To address the enzymatic activity of the isolated protein, murine FATP1 and acyl CoA synthetase 1 (ACS1) were engineered to contain a C-terminus myc-his tag, expressed in COS1 cells via adenoviral-mediated infection and purified to homogeneity using nickel affinity chromatography. Kinetic analysis of the purified enzymes was carried out for long chain palmitic acid (C16:0) and very long chain lignoceric acid (C24:0) as well as for ATP, and CoA. FATP1 exhibited similar substrate specificity for fatty acids 16 to 24 carbons in length while ACS1 was 10-fold more active on long chain fatty acids relative to very long chain fatty acids. The very long chain acyl CoA synthetase activity of the two enzymes was comparable as were the Km values for both ATP and Coenzyme A. Interestingly, FATP1 was insensitive to inhibition by triacsin C whereas ACS1 was inhibited by micromolar concentrations of the compound. These data represent the first characterization of purified FATP1 and indicate that the enzyme is a broad substrate specificity acyl CoA synthetase. These findings are consistent with the hypothesis that that fatty acid uptake into cells is linked to their esterification with Coenzyme A.
J. Biol. Chem, 10.1074/jbc.M306575200
Submitted on June 20, 2003
Revised on August 22, 2003
Accepted on August 22, 2003
Characterization of the Acyl CoA synthetase activity of purified murine fatty acid transport protein 1
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