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[Characterization, in the guinea pig, of a hepatic cytosol protein binding dehydroepiandrosterone sulfate and estrone sulfate].

A protein which binds dehydroepiandrosterone sulfate and estrone sulfate was detected in the cytosolic fraction of female Guinea-pig liver. It is characterized by a molecular mass of 14,400 Da, its affinity for DHEA sulfate (KD = 8.8 microM) and estrone sulfate (KD = 8.5 microM), and its lack of affinity for free steroids such as dehydroepiandrosterone or estrone. It is eluted by gel filtration on Sephadex G-50 simultaneously with the inhibitor of microsomal DHEA sulfatase recently described by some of us. This protein could be implicated in the intracellular transport or in the metabolism of sulfated steroids.