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

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monophosphate analogs which can easily be converted to the active triphosphate form <strong>by</strong> adding two<br />

additional phosphates [48,49], and can inhibit HIV replication [50,52].<br />

Page 51<br />

Analysis of the structure of the HIV-1 RT/DNA/Fab complex showed that the dNTP-binding site is<br />

composed of both protein and nucleic acid. In addition to the 5'-terminus of the template nucleotide and<br />

three carboxylate residues (Asp110, Asp185, and Asp186), the amino acid residues Asp113, Tyr115,<br />

Phe116, Gln151, Phe160, and possibly Met184 and Lys219 form part of the putative dNTP-binding site<br />

[12,53] (Figure 4 and Table 2). It is important to realize that the precise composition, position, and<br />

conformation of the template-primer can influence the recognition and incorporation of incoming<br />

nucleotides at the polymerase catalytic site. In the wild-type HIV-1 RT, the dNTP-binding<br />

Figure 4<br />

Stereoview of the polymerase active site of HIV-1 RT [38]. The amino acid<br />

residues that compose the putative dNTP-binding site, including the three catalytically<br />

essential aspartic acids, are shown with side chains. The double-stranded nucleic acid is<br />

shown with the atomic model in the HIV-1 RT/DNA/Fab complex. The dNTP-binding<br />

site consists of structural elements from both protein and nucleic acid. The precise<br />

composition, position, and conformation of the template-primer can affect the recognition of<br />

incoming dNTPs at the polymerase active site.<br />

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