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 />

Figure 3<br />

Generation of combinatorial libraries.<br />

Traditional combinatorial libraries <strong>based</strong> on<br />

polypeptides or polynucleotides were built up<br />

<strong>by</strong> oligomer condensation and achieved a<br />

high level of diversity through conformational<br />

flexibility. Small-molecule libraries of drug-like<br />

molecules can be built up using a variety of<br />

strategies that focus on maximizing chemical<br />

diversity while (generally) minimizing<br />

conformational flexibility.<br />

Page 529<br />

From the drug discovery perspective, large combinatorial libraries have the same utility as conventional<br />

pharmaceutical or natural-product compound libraries, i.e., as a source of leads for new drugs. The<br />

design of large combinatorial libraries is driven <strong>by</strong> the requirement that individual reactions be highly<br />

reliable and versatile, while producing libraries with the highest possible degree of chemical diversity.<br />

Individual steps must be optimized, the compatibility of building blocks must be examined thoroughly<br />

and the synthesis must be automated. As a consequence, a significant investment in time and resources<br />

must be made before a library can actually be produced. <strong>Design</strong>ed and used in this way, large<br />

combinatorial libraries provide a new source of screening leads. However, libraries with maximum<br />

diversity, which may be used for “blind” lead discovery, do not address the principle rate-limiting step<br />

in drug discovery, the elaboration of a suitable SAR around the lead compound after an active lead has<br />

been discovered.<br />

http://legacy.netlibrary.com/nlreader/nlReader.dll?bookid=12640&filename=Page_529.html (1 of 2) [4/9/2004 12:49:08 AM]

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

Saved successfully!

Ooh no, something went wrong!