Regulation of rat hepatic peroxisomal enoyl-CoA hydratase-3-hydroxyacyl-CoA dehydrogenase bifunctional enzyme by thyroid hormone. |
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Authors: | T Takeda K Ichikawa T Miyamoto M Kobayashi Y Nishii S Suzuki A Sakurai K Hashizume |
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Institution: | Department of Geriatrics, Endocrinology and Metabolism, Shinshu University School of Medicine, Matsumoto, Japan. |
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Abstract: | Rat hepatic t protein that is negatively regulated by thyroid hormone in nuclear globulin extract was characterized by the antibodies. The following evidence indicated that t protein is a peroxisomal enoyl-CoA hydratase-3-hydroxyacyl-CoA dehydrogenase bifunctional enzyme (bifunctional enzyme). 1. Both proteins had an identical molecular size, and were immunologically indistinguishable from each other. 2. The t protein was abundant in mitochondrial fraction which contained abundant peroxisomes. 3. The amount of the t protein was increased by a peroxisomal proliferator. 4. The activity of the peroxisomal bifunctional enzyme corresponded to the t protein in CM-Sephadex column chromatography. The amount of peroxisomal bifunctional enzyme was increased by thyroidectomy and decreased by 3,5,3'- triiodo-L-thyronine treatment in the whole homogenate of rat liver. These results indicate that the levels of peroxisomal bifunctional enzyme were regulated by thyroid hormone in vivo. |
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