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

You also want an ePaper? Increase the reach of your titles

YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.

Document<br />

Figure 7<br />

Schematic of the primary amino sequence of the human B2 receptor. Shown<br />

in black are residues experimentally identified as contributing to an agonist binding site.<br />

The dark gray residues are suspect positions for contributing to an antagonist site. The<br />

residues colored light gray have been mutagenized only in the rat B2 receptor, but they<br />

are conserved in the human. The Thr 263 rarrow.gif Ala mutation interferes with agonist binding<br />

only, while Gln 260 partially interferes with agonist and first generation antagonist<br />

binding.<br />

Page 140<br />

within the context of these TM6 residues. Currently, we have prepared these mutant receptors, but at this<br />

time binding to NPC 17410 remains unfinished.<br />

A summary of the amino acids in the human B2 receptor implicated in comprising either agonist or<br />

antagonist sites are highlighted in Figure 7. Marked in dark black are the residues of extracellular loop 3,<br />

TM 6, and the extracellular N-terminal segment that have been shown to participate in agonist binding.<br />

Marked in dark gray in TM 6 and TM 3 are residues likely to partially comprise an antagonist binding<br />

site <strong>based</strong> primarily on the chimeric receptor studies described previously, although there is no explicit<br />

experimental evidence as yet. Shown in light gray are two residues that are conserved between rat and<br />

human B2 receptors. Mutagenesis experiments have been done on this pair in the rat B2<br />

http://legacy.netlibrary.com/nlreader/nlReader.dll?bookid=12640&filename=Page_140.html (1 of 2) [4/5/2004 5:00:06 PM]

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

Saved successfully!

Ooh no, something went wrong!