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Figure 2<br />

Ribbon diagrams of the three types of HIV-1 RT crystal structures. (a) <strong>Structure</strong> of the HIV-1 RT/DNA/Fab ternary complex<br />

[38]. The bound nucleic acid is shown as double-stranded helices with template strand in black and primer strand in gray. The Fab<br />

fragment is not shown. (b) <strong>Structure</strong> of the HIV-1 RT complexed with the NNRTI TIBO R86183 [34]. For the sake of clarity, the bound<br />

TIBO inhibitor is shown as an atomic model. (c) <strong>Structure</strong> of unliganded HIV-1 RT [41,43]. (d) A schematic diagram showing the<br />

resemblance of the HIV-1 RT p66 subunit to a human right hand. The RNase H domain, which has no counterpart for a human hand, is<br />

shown as an oval below the thumb. When a template-primer binds to HIV-1 RT, the fingers, palm, and thumb subdomains of p66 form a<br />

large cleft to bind the DNA. The polymerase active site (shown as a small circle) lies at the bottom of the DNA-binding cleft. The<br />

NNRTI binds in the highly hydrophobic NNIBP (shown as a large circle), which is located in the vicinity of the polymerase active site.<br />

The p66 thumb subdomain in the NNRTI-bound HIV-1 RT structures is in an upright position extended beyond that observed in the<br />

structure of RT with bound DNA. In the absence of any bound nucleic acid or NNRTI, however, the p66 thumb folds down into the<br />

DNA-binding cleft (shown as dashed drawing).<br />

http://legacy.netlibrary.com/nlreader/nlReader.dll?bookid=12640&filename=Page_47.html [4/5/2004 4:48:52 PM]<br />

Page 47

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