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

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Analysis of various HIV-1 RT structures has revealed an unusual β-turn geometry for the YMDD motif<br />

at the polymerase catalytic site of p66 [33,34,41–43]. The energetically unfavorable main chain<br />

conformation of Met184 (torsion angles φ~60° and ϕ~-120°) is stabilized <strong>by</strong> a hydrogen bond of its<br />

carbonyl oxygen to the side chain of either Gln182 [33,41,43] or Gln161 [42]. It has been suggested that<br />

this novel β-turn geometry might be required to position the aspartic acids in precisely the correct way<br />

for catalysis [41].<br />

IV. Mechanism of NRTI-Resistance Mutations<br />

Development of resistance to NRTIs has been a major problem with clinical use of these drugs. Careful<br />

analysis of mutations that confer resistance to different<br />

http://legacy.netlibrary.com/nlreader/nlReader.dll?bookid=12640&filename=Page_52.html (2 of 2) [4/5/2004 4:49:26 PM]

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