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III. Results and Discussion<br />

Figure 5<br />

<strong>Structure</strong> of α helix F interface of human 11β-hydroxysteroid dehydrogenase types 1<br />

and 2. The α helix F part of the dimer interface on 11β-HSD-1 and -2 is shown along<br />

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

that are oriented into the cavity that binds substrate and nucleotide cofactor.<br />

A. NADPH Binding Site on 11β-Hydroxysteroid Dehydrogenase Types 1 and 2<br />

Page 200<br />

Several lines of evidence—sequence analysis, mutagenesis studies, and the solved 3D structure of<br />

homologs of 11β-HSD—indicate that the nucleotide binding site in these enzymes has many similarities<br />

to that in other classes of dehydrogenases. For many dehydrogenases, the nucleotide binding domain<br />

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