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Department of Molecular Physiology and Biophysics Vanderbilt University School of Medicine Nashville, Tennessee 37232-0615
Phosphoenolpyruvate carboxykinase (PEPCK) catalyzes the rate-limiting step of gluconeogenesis. The activity of this enzyme is controlled by several hormones, including glucocorticoids, glucagon, retinoic acid, and insulin, that principally affect the rate of transcription of the PEPCK gene. Glucocorticoids induce PEPCK gene transcription through a complex glucocorticoid response unit that consists of, from 5' to 3', accessory factor elements AF1 and AF2; two noncanonical glucocorticoid receptor-binding sites, GR1 and GR2; a third accessory factor element, AF3; and a cAMP-response element, CRE. A complete glucocorticoid response is dependent on the presence of both GR-binding sites, all three accessory elements, and the CRE. In this study we assess the relative roles of GR1 and GR2 in the context of the glucocorticoid response unit and use a combination of binding and function assays to compare GR1 and GR2 to glucocorticoid response elements (GREs) that conform closely to the consensus sequence. The relative binding affinity of GR follows the order: consensus GRE >> GR1 > GR2. Mutations that disrupt the binding of GR to GR1 result in a major reduction of the glucocorticoid response, whereas similar mutations of GR2 have a much smaller effect. Unlike the simple consensus GRE, neither GR1 nor GR2 mediate a glucocorticoid response through a heterologous promoter. The accessory elements appear to have different functional roles. AF2 is still needed for a maximal glucocorticoid response when GR1 is converted to a high-affinity GR-binding element, but AF1 and AF3 are not required.
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