UC San Diego UC San Diego Previously Published Works Title Evolution of 17beta-Hydroxysteroid Dehydrogenases and Their Role in Androgen, Estrogen and Retinoid Action Permalink https://escholarship.org/uc/item/1md640v5 Journal Molecular and Cellular Endocrinology, 171 Author Baker, Michael E Publication Date 2001 Peer reviewed eScholarship.org Powered by the California Digital Library University of California Molec ular and Cellular Endocrinol ogy vol. 171, pp. 211 -215, 2001. Evolution of 17 -Hydroxysteroid Dehydrogenases and Their Role in Androgen, Estrogen and Retinoid Action Michael E. Baker Department of Medicine, 0823 University of California, San Diego 950 0 Gilman Drive La Jolla, CA 92093 -0823 phone: 858 -534 -8317 fax: 858 -822 -0873 e-mail:
[email protected] Abstract. 17 -hydroxysteroid dehydrogenases (17 -HSDs) regulate androgen and estrogen concentrations in mammals. By 1995, four distinct enzymes with 17 -HSD activity had been identified: 17 -HSD -types 1 and 3, which in vivo are NADPH -dependent reductases; 17 -HSD - types 2 and 4, which in vivo are NAD +-dependent oxidases. Since then six additional enzymes with 17 -HSD activity have been isolated from mammal s. With the exception of 17 -HSD –type 5, which belongs to the aldoketo -reductase (AKR) family, these 17 -HSDs belong to the short chain dehydrogenases/reductases (SDR) family. Several 17 -HSDs appear to be examples of convergent evolution. That is, 17 -HSD activity arose several times from different ancestors. Some 17 -HSDs share a common ancestor with retinoid oxido -reductases and have retinol dehydrogenase activity. 17 -HSD -types 2, 6 and 9 appear to have diverged from ancestral retinoid dehydrogenas es early in the evolution of deuterostomes during the Cambrian, about 540 million years ago.