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A more recent version of this article appeared on February 1, 2008
Papers In Press, published online ahead of print November 30, 2007
J. Biol. Chem, 10.1074/jbc.M705774200
Submitted on July 13, 2007
Revised on November 28, 2007
Accepted on November 30, 2007
c-Met inhibitors with novel binding mode show activity against several hereditary papillary renal cell carcinoma related mutations
Steven F. Bellon, Paula Kaplan-Lefko, Yajing Yang, Yihong Zhang, Jodi Moriguchi, Karen Rex, Carol W. Johnson, Paul E. Rose, Alexander M. Long, Anne B. O'Connor, Yan Gu, Angela Coxon, Tae-Seong Kim, Andrew Tasker, Teresa L. Burgess, and Isabelle Dussault
Oncology research, Amgen Inc., Thousand Oaks, CA 91320-1799
Corresponding Author: idussaul{at}amgen.com
c-Met is a receptor tyrosine kinase often deregulated in human cancers thus making it an attractive drug target. One mechanism by which c-Met deregulation leads to cancer is through gain-of-function mutations. Therefore, small molecules capable of targeting these mutations could offer therapeutic benefits for affected patients. SU11274 was recently described and reported to inhibit the activity of the wild-type and some mutant forms of c-Met while other mutants are resistant to inhibition. We identified a novel series of c-Met small molecule inhibitors that are active against multiple mutants previously identified in hereditary papillary renal cell carcinoma patients. AM7 is active against wild-type c-Met as well as several mutants, inhibits c-Met-mediated signaling in MKN-45 and U-87 MG cells, and inhibits tumor growth in these two models grown as xenografts. The crystal structures of AM7 and SU11274 bound to unphosphorylated c-Met have been determined. The AM7 structure reveals a novel binding mode compared with other published c-Met inhibitors and SU11274. The molecule binds the kinase linker, and then extends into a new hydrophobic binding site. This binding site is created by a significant movement of the C-helix, and so represents an inactive conformation of the c-Met kinase. Thus, our results demonstrate that it is possible to identify and design inhibitors that will likely be active against mutants found in different cancers.

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Copyright © 2007 by the American Society for Biochemistry and Molecular Biology.
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