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

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Most of the amino acid residues that form the binding pocket are hydrophobic and five of them are<br />

aromatic residues. The hydrophobic interactions of the side chains of these residues, especially Tyr181,<br />

Tyr188, and Trp229, with the hydrophobic moieties of the NNRTIs appear to be important for inhibitor<br />

binding [32–34,59]. Since most of the NNRTIs also contain polar group(s), they have the potential to<br />

form hydrogen bonds with surrounding amino acid residues either directly or via water bridges [33–36].<br />

In the structures of both liganded HIV-1 RT and the HIV-1 RT/DNA/Fab complex, there are two small<br />

surface depressions at the base of the NNIBP that are the putative entrances to the pocket [34,43]. One<br />

surface depression is located at the p66/p51 heterodimer interface and is composed of amino acid<br />

residues Leu100, Lys101, Lys103, Val179, Tyr181, and Tyr188 of p66, and Glu138 of p51 [34]. This<br />

putative entrance is narrow compared to the size of the NNRTIs. Another surface depression has been<br />

found at the location near the base of the p66 thumb subdomain between two adjacent structural<br />

elements: the β5–β6 connecting loop (Lys101 and Lys103) and the β13–β14 hairpin (Pro236 and<br />

Leu238) [43]. Since this site is also exposed to solvent, an NNRTI could approach the NNIBP from it.<br />

How-<br />

http://legacy.netlibrary.com/nlreader/nlReader.dll?bookid=12640&filename=Page_58.html (2 of 2) [4/5/2004 4:50:15 PM]

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