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Figure 2<br />

A number of ALR2 inhibitors that have entered clinical trails.<br />

structures show the protein to fold into a (β/α) 8 barrel (Figure 3). This fold has emerged as the most<br />

common enzyme motif [19] although most of the proteins adopting this structure share no sequence<br />

homology. The ALR2 enzyme is, however, the first NAD(P)H binding protein to adopt this fold. It<br />

contains an extra β hairpin preceding the first β strand, which caps the N-terminal end of the barrel. It<br />

also has two helices that are not part of the regular barrel. One precedes α7 and the other follows α8.<br />

A. Cofactor Binding<br />

The NADPH cofactor is bound in an extended conformation across the C-terminal end of the β barrel.<br />

The catalytically active nicotinamide moiety is located<br />

http://legacy.netlibrary.com/nlreader/nlReader.dll?bookid=12640&filename=Page_232.html (1 of 2) [4/5/2004 5:08:09 PM]<br />

Page 232

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