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Page 611<br />

of a P 1'–P 3' peptide scaffold [54]. To date, no 3D structural information is available for MMP-2 with<br />

respect to either the apoprotein catalytic domain or inhibitor complexes thereof. Finally, in the example<br />

of stromelysin-1, potent inhibitors have been designed (e.g., 49, Figure 11 [55]) <strong>by</strong> N-terminal<br />

carboxyalkylamino functionalization that includes a P 1 substituent. An x-ray crystallographic structure<br />

of a related MMP-3 inhibitor 125 shows (Figure 29) the hydrogen-bonding interactions at the active site<br />

and carboxylate coordination with the Zn 2+ [223]. Finally, a recently determined x-ray crystallographic<br />

structure of an Pheψ[P=O(OH)CH 2]Ala-modified peptide inhibitor 126 complexed with astacin (Figure<br />

29) shows the extensive hydrogen-bonding network between inhibitor, enzyme, Zn 2+, and a structural<br />

water [226]. It is expected that iterative structure-<strong>based</strong> design of inhibitors of the MMP family will<br />

enable the discovery of novel compounds with superior binding affinities and/or selectivities.<br />

C. Signal-Transduction Protein Targets<br />

Beyond proteases the opportunity for structure-<strong>based</strong> drug design is being realized in the rapidly<br />

developing area of signal-transduction research (e.g., intracellular protein and nucleic acid targets). Both<br />

x-ray crystallography and/or NMR spectroscopy have significantly contributed to a wide-scope database<br />

of 3D structural information for various catalytic and noncatalytic signal-transduction protein targets<br />

(see Table 3). These include tyrosine kinases (e.g., growth factor receptor kinases and Src family<br />

kinases; for reviews see Reference 231), serine/threonine and “dual specificity” kinases (e.g., mitogenactivated<br />

protein kinases and CDK2 and cAMP-dependent protein kinases; for reviews see Reference<br />

232), phosphotyrosine phosphatases (e.g., PTP1B and Syp; for reviews see Reference 233),<br />

phosphoserine/phosphothreonine and “dual specificity” phosphatases (e.g., VH1 and CDC25; for<br />

reviews see Reference 234), noncatalytic “adapter” proteins (e.g., Crk, Grb2, Shc, and IRS-1; for<br />

reviews see Reference 85), transferases (e.g., Ras farnesyl transferase; for reviews see Reference 81),<br />

proline cis-trans isomerases (e.g., FKBP-12 and cyclophilin A; for reviews see Reference 235), and GTPbinding<br />

proteins (e.g., p21 Ras and α-β/γ heterotrimeric G-protein for GPCR superfamily; for reviews<br />

see References 236 and 237, respectively). The diversity of targets, mechanistic relationships (e.g.,<br />

enzyme–substrate or regulatory protein–protein interaction), and potential therapeutic opportunities has<br />

created great impetus for focused research in the area of signal transduction (for reviews see References<br />

265–267).<br />

Src Homology-2 and Homology-3 Domains<br />

The identification of noncatalytic regulatory domains referred to as Src homology (SH) domains has<br />

been rapidly advanced over recent years as a critical link<br />

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