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netLibrary - eBook Summary Structure-based Drug Design by ...

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Figure 5<br />

(Continued)<br />

Page 224<br />

versus IC 50=15 nM for cAPK). Yet enhancement of specificity utilizing the inhibitor CGP52411 (Figure<br />

4), whose selectivity originates in the occupancy <strong>by</strong> one of the anilino moieties of the inhibitor in the<br />

region of the enzyme cleft that normally binds the ribose ring of ATP, is considerable. The inhibitor<br />

CGP52411 inhibits the EGFR tyrosine kinase with an IC 50 value of 300 nM while it is less active <strong>by</strong> at<br />

least two orders of magnitude on a panel of protein kinases including cAPK, phosphorylase kinase,<br />

casein kinase, protein kinase C (most isoforms), and v-abl, c-lyn, c-fgr tyrosine kinases.<br />

Hence, the three-dimensional model of EGFR tyrosine kinase rationalizes the specificity of the<br />

CGP52411 inhibitor. This model suggests that analysis of the putative regions of the ribose binding of<br />

ATP in other kinases through template modeling would provide the required chemical modification of<br />

pharmacophores to enhance their selectivity. In modeling, the use of the bidendate hydrogen bonding<br />

provided <strong>by</strong> the linker region (Figure 3a) of the conserved<br />

http://legacy.netlibrary.com/nlreader/nlReader.dll?bookid=12640&filename=Page_224.html [4/5/2004 5:07:34 PM]

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