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Figure 6<br />

(a) CPK representation of the individual structure of<br />

AP-B [47], which is closest to the average over the<br />

whole molecule, showing residues thought to contribute<br />

to the cardioactive pharmacophore. The surfaces of<br />

residues 7 and 9 are shaded black, those of 14, 37, 39, and<br />

48 dark grey, and that of 35 lighter grey. As discussed in<br />

the text, the primary functions of Asp9 (the side chain of<br />

which is hardly visible in this view) and Asn35 may be to<br />

maintain the local structure in an active conformation,<br />

but it cannot be excluded that they also interact directly<br />

with the sodium channel. In AP-B the cationic side<br />

chains of Arg12 and Lys49 are also important, but it<br />

appears that their roles can be compensated for <strong>by</strong> near<strong>by</strong><br />

cationic side chains (Arg14 and Lys48, respectively) and<br />

that they favor binding to the neuronal sodium channel<br />

rather than the cardiac channel [53]. (b) Connolly surface<br />

of AP-B in the same orientation as in part a, with the<br />

charged residues Asp7, Asp9, Arg14, Lys37, and Lys48<br />

highlighted. This figure was generated using Insight<br />

(Biosym Technologies).<br />

http://legacy.netlibrary.com/nlreader/nlReader.dll?bookid=12640&filename=Page_311.html (2 of 2) [4/5/2004 5:24:01 PM]

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