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Papers In Press, published online ahead of print September 1, 2003
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Pharmacology and Toxicology, University of Alabama at Birmingham, Birmingham, AL 35294
Corresponding Author: charles.falany{at}ccc.uab.edu
Bile acid CoA: amino acid N-acyltransferase (BAT) is responsible for the amidation of bile acids with the amino acids taurine and glycine. Rat liver BAT (rBAT) cDNA was isolated from a rat liver
Revised on August 18, 2003
Accepted on August 19, 2003
Rat liver bile acid CoA:amino acid N-acyltransferase: expression, characterization, and peroxisomal localization
ZAP cDNA library and expressed in Sf9 insect cells using a baculoviral vector. rBAT displayed 65% amino acid sequence homology with human BAT (hBAT) and 85% homology with mouse BAT (mBAT). Similar to hBAT, expressed rBAT was capable of forming both taurine and glycine conjugates with cholyl-CoA. mBAT, which is highly homologous to rBAT, forms only taurine conjugated bile acids (Falany et al. J. Lipid Res. 38:86, 1997). Immunoblot analysis of rat tissues detected rBAT only in rat liver cytosol following homogenization and ultracentrifugation. Subcellular localization of rBAT detected activity and immunoreactive protein in both cytosol and isolated peroxisomes. Rat bile acid CoA ligase (rBAL), the enzyme responsible for the formation of bile acid CoA esters, was detected only in rat liver microsomes. Treatment of rats with clofibrate, a known peroxisomal proliferator, significantly induced rBAT activity, message and immunoreactive protein in rat liver. Peroxisomal membrane protein-70 (PMP70), a marker for peroxisomes, was also induced by clofibrate whereas rBAL activity and protein amount were not affected. In summary, rBAT is capable forming both taurine and glycine bile acid conjugates and the enzyme is localized primarily in peroxisomes in rat liver.
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