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Document<br />

Figure 10<br />

Proposed model of dansyl-Glu-Gly-Arg-chloromethyl ketone in Factor Xa [4,69].<br />

Page 280<br />

Tulinsky and coworkers [4] have proposed a model for the complex of dansyl-Glu-Gly-Argchloromethyl<br />

ketone using the thrombin-PPACK crystal structure as a template for the fit to Factor Xa<br />

(Figure 10).<br />

Using antistasin as a starting point, Ohta et al. [68] have synthesized a series of cyclic peptides <strong>based</strong> on<br />

the antistasin sequence. Three of these peptides are shown below and represent the most potent in the<br />

series.<br />

ATS29-47 NH2-Ser-Gly-Val-Arg-Cys * -Arg-Val-His-Cys * -Pro-His-Gly-Phe-Gln-Arg-<br />

Ser-Arg-Tyr-Gly-OH<br />

K i (FXa)<br />

0.035 µM<br />

ATS29-40 NH2-Ser-Gly-Val-Arg-Cys * -Arg-Val-His-Cys * -Pro-His-Gly-OH 11.8 µM<br />

dR-ATS32-38 NH2-dArg-Cys-Arg-Val-His-Cys-Pro-OH 0.96 µM<br />

(The Cys * -Cys * are joined in disulfide bonds to form cyclic structures)<br />

http://legacy.netlibrary.com/nlreader/nlReader.dll?bookid=12640&filename=Page_280.html (1 of 2) [4/5/2004 5:13:29 PM]

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