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J Biol Chem, Vol. 275, Issue 2, 1105-1111, January 14, 2000

Dehydroepiandrosterone and Dihydrotestosterone Recognition by Human Estrogenic 17-Hydroxysteroid Dehydrogenase
C-18/C-19 STEROID DISCRIMINATION AND ENZYME-INDUCED STRAIN^*

Qing Han, Robert L. Campbell, Anne Gangloff, Yi-Wei Huang, and Sheng-Xiang Lin^§

From the Medical Research Council Group in Molecular Endocrinology, CHUL Research Center and Laval University, Ste-Foy, Québec G1V 4G2, Canada

Steroid hormones share a very similar structure, but they behave distinctly. We present structures of human estrogenic 17-hydroxysteroid dehydrogenase (17-HSD1) complexes with dehydroepiandrosterone (DHEA) and dihydrotestosterone (DHT), providing the first pictures to date of DHEA and DHT bound to a protein. Comparisons of these structures with that of the enzyme complexed with the most potent estrogen, estradiol, revealed the structural basis and general model for sex hormone recognition and discrimination. Although the binding cavity is almost entirely composed of hydrophobic residues that can make only nonspecific interactions, the arrangement of residues is highly complementary to that of the estrogenic substrate. Relatively small changes in the shape of the steroid hormone can significantly affect the binding affinity and specificity. The K_m of estrone is more than 1000-fold lower than that of DHEA and the K_m of estradiol is about 10 times lower than that of DHT. The structures suggest that Leu-149 is the primary contributor to the discrimination of C-19 steroids and estrogens by 17-HSD1. The critical role of Leu-149 has been well confirmed by site-directed mutagenesis experiments, as the Leu-149  Val variant showed a significantly decreased K_m for C-19 steroids while losing discrimination between estrogens and C-19 steroids. The electron density of DHEA also revealed a distortion of its 17-ketone toward a -oriented form, which approaches the transition-state conformation for DHEA reduction.

The atomic coordinates and the structure factors (code 3dhe and 1dht (for DHEA and DHT complexes, respectively)) have been deposited in the Protein Data Bank, Research Collaboratory for Structural Bioinformatics, Rutgers University, New Brunswick, NJ (http://www.rcsb.org/).

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