Quantification and regulation of the subcellular distribution of bile acid coenzyme A:amino acid N-acyltransferase activity in rat liver.

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Styles NA, Falany JL, Barnes S, Falany CN

Quantification and regulation of the subcellular distribution of bile acid coenzyme A:amino acid N-acyltransferase activity in rat liver.

J Lipid Res. 2007 Jun;48(6):1305-15. Epub 2007 Mar 22.

PubMed ID

17379925 [ View in PubMed

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Abstract

Bile acid coenzyme A:amino acid N-acyltransferase (BAT) is responsible for the amidation of bile acids with the amino acids glycine and taurine. To quantify total BAT activity in liver subcellular organelles, livers from young adult male and female Sprague-Dawley rats were fractionated into multiple subcellular compartments. In male and female rats, 65-75% of total liver BAT activity was found in the cytosol, 15-17% was found in the peroxisomes, and 5-10% was found in the heavy mitochondrial fraction. After clofibrate treatment, male rats displayed an increase in peroxisomal BAT specific activity and a decrease in cytosolic BAT specific activity, whereas females showed an opposite response. However, there was no overall change in BAT specific activity in whole liver homogenate. Treatment with rosiglitazone or cholestyramine had no effect on BAT activity in any subcellular compartment. These experiments indicate that the majority of BAT activity in the rat liver resides in the cytosol. Approximately 15% of BAT activity is present in the peroxisomal matrix. These data support the novel finding that clofibrate treatment does not directly regulate BAT activity but does alter the subcellular localization of BAT.

DrugBank Data that Cites this Article

Drug Targets

Drug	Target	Kind	Organism	Pharmacological Action	Actions
Glycine	Bile acid-CoA:amino acid N-acyltransferase	Protein	Humans	Unknown	Substrate	Details