3fjn
From Proteopedia
The crystal structure of 17-alpha hydroxysteroid dehydrogenase Y224D mutant.
Structural highlights
FunctionAK1CL_MOUSE NADP-dependent 17-alpha-hydroxysteroid dehydrogenase that converts 5-alpha-androstane-3,17-dione into androsterone. Has lower 3-alpha-hydroxysteroid dehydrogenase activity. Has broad substrate specificity and acts on various 17-alpha-hydroxysteroids, 17-ketosteroids, 3-alpha hydroxysteroids and 3-ketosteroids. Reduction of keto groups is strictly stereoselective. Reduction of 17-ketosteroids yields only 17-alpha-hydroxysteroids. Likewise, reduction of 3-ketosteroids yields only 3-alpha-hydroxysteroids.[1] [2] [3] Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedMouse 3(17)alpha-hydroxysteroid dehydrogenase (AKR1C21) is the only aldo-keto reductase that catalyzes the stereospecific reduction of 3- and 17-ketosteroids to the corresponding 3(17)alpha-hydroxysteroids. The Y224D mutation of AKR1C21 reduced the K(m) value for NADP(H) by up to 80-fold and completely reversed the 17alpha stereospecificity of the enzyme. The crystal structure of the Y224D mutant at 2.3 A resolution revealed that the mutation resulted in a change in the conformation of the flexible loop B, including the V-shaped groove, which is a unique feature of the active-site architecture of wild-type AKR1C21 and is formed by the side chains of Tyr224 and Trp227. Furthermore, mutations (Y224F and Q222N) of residues involved in forming the safety belt for binding of the coenzyme showed similar alterations in kinetic constants for 3alpha-hydroxy/3-ketosteroids and 17-hydroxy/ketosteroids compared with the wild type. Studies on a Tyr residue critical for the binding of coenzyme and substrate in mouse 3(17)alpha-hydroxysteroid dehydrogenase (AKR1C21): structure of the Y224D mutant enzyme.,Dhagat U, Endo S, Mamiya H, Hara A, El-Kabbani O Acta Crystallogr D Biol Crystallogr. 2010 Feb;66(Pt 2):198-204. Epub 2010, Jan 22. PMID:20124700[4] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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