10.12.2012 Views

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

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

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

SHOW MORE
SHOW LESS

Create successful ePaper yourself

Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.

Document<br />

Hydrophobicity Requirements<br />

<strong>Drug</strong> binding is enhanced <strong>by</strong> hydrophobicity in that portion of the drug that binds to the pocket toe.<br />

Quantitative structure-activity relationship (QSAR) analysis of these compounds have consistently<br />

shown that the most predictive parameter of antiviral activity is a measure of hydrophobicity, the<br />

octanol:water partition coefficient (logP) [80,82,85]. These studies have also consistently shown that<br />

there is no apparent correlation between electrostatic potential or dipole moment and potency.<br />

Page 507<br />

This evidence suggests that the drug—pocket interactions in the toe of the pocket are low-intensity<br />

hydrophobic interactions. Supporting this hypothesis is the finding that many structurally diverse<br />

molecules can be accommodated in this region, and even structurally similar molecules can bind in<br />

distinctly different conformations. Closely related structures have been shown to shift along their long<br />

axis <strong>by</strong> as much as 1.6 Å with respect to their phenoxy substituents [55]. There is even more variability<br />

with respect to the isoxazole placement (Table 5, Figure 9). No single hydrogen-bonding or electrostatic<br />

interaction appears to predominate within the pocket toe.<br />

http://legacy.netlibrary.com/nlreader/nlReader.dll?bookid=12640&filename=Page_507.html [4/9/2004 12:42:05 AM]

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!