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Page 205<br />

enzyme and of phenylalanine-194 on 11β-hydroxysteriod dehydrogenase type 1 is quite different; it may<br />

be important in the different catalytic properties of these two enzymes.<br />

J. Human 17β-HSD-1<br />

Figure 6a shows the modeled α helix F interface in human 17β-hydroxysteroid dehydrogenase type 1 in<br />

which phenylalanine-160 and alanine-161 form an anchor. Both residues have important stabilizing<br />

interactions across the dimer interface. Alanine-161 is 4.1 Å from alanine-161 on the other subunit.<br />

Alanine-161 has a hydrophobic interaction with alanine-157, which is in the segment between the<br />

conserved tyrosine-155 and lysine-159. There is a hydrophobic<br />

http://legacy.netlibrary.com/nlreader/nlReader.dll?bookid=12640&filename=Page_205.html [4/5/2004 5:06:24 PM]

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