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Figure 6<br />

<strong>Structure</strong> of α helix F interface of mammalian 17β-hydroxysteroid dehydrogenases.<br />

The α helix F part of the dimer interface on 17β-hydroxysteroid dehydrogenases is<br />

shown along with side chains of the highly conserved tyrosine and lysine residues<br />

and three other residues that are oriented into the cavity that binds substrate and nucleotide<br />

cofactor. (a) Modeled structure of human 17β-hydroxysteroid dehydrogenase type 1.<br />

(b) Modeled structure of human 17β-hydroxysteroid dehydrogenase type 2. (c) Modeled<br />

structure of human 17β-hydroxysteroid dehydrogenase type 3. (d) Modeled structure of<br />

porcine 17β-hydroxysteroid dehydrogenase type 4.<br />

with leucine-242, which is 4.2 Å distant. Threonine-245 is 4.2 Å from the C α carbon of glycine-230.<br />

http://legacy.netlibrary.com/nlreader/nlReader.dll?bookid=12640&filename=Page_204.html (1 of 2) [4/5/2004 5:06:14 PM]<br />

Page 204

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