Secondary amides of sulfonylated 3-amidinophenylalanine. New potent and selective inhibitors of matriptase.
Matriptase is an epithelium-derived type II transmembrane serine protease and has been implicated in the activation of substrates such as pro-HGF/SF and pro-uPA, which are likely involved in tumor progression and metastasis. Through screening, we have identified bis-basic secondary amides of sulfonylated 3-amidinophenylalanine as matriptase inhibitors. X-ray analyses of analogues 8 and 31 in complex with matriptase revealed that these inhibitors occupy, in addition to part of the previously described S4-binding site, the cleft formed by the molecular surface and the unique 60 loop of matriptase. Therefore, optimization of the inhibitors included the incorporation of appropriate sulfonyl substituents that could improve binding of these inhibitors into both characteristic matriptase subsites. The most potent derivatives inhibit matriptase highly selective with K(i) values below 5 nM. Molecular modeling revealed that their improved affinity results from interaction with the S4 site of matriptase. Analogues 8 and 59 were studied in an orthotopic xenograft mouse model of prostate cancer. Compared to control, both inhibitors reduced tumor growth, as well as tumor dissemination.
Steinmetzer
Torsten
T
Curacyte Chemistry GmbH, Winzerlaer Strasse 2, D-07745 Jena, Germany. torsten.steinmetzer@curacyte.com
Schweinitz
Andrea
A
Stürzebecher
Anne
A
Dönnecke
Daniel
D
Uhland
Kerstin
K
Schuster
Oliver
O
Steinmetzer
Peter
P
Müller
Friedemann
F
Friedrich
Rainer
R
Than
Manuel E
ME
Bode
Wolfram
W
Stürzebecher
Jörg
J
D000577:Amides / Q000138:chemical synthesis* / Q000494:pharmacology; D000578:Amidines / Q000138:chemical synthesis* / Q000494:pharmacology; D000818:Animals; D020134:Catalytic Domain; D018360:Crystallography, X-Ray; D006801:Humans; D007700:Kinetics; D008297:Male; D051379:Mice; D008819:Mice, Nude; D008958:Models, Molecular; D009362:Neoplasm Metastasis; D010649:Phenylalanine / Q000031:analogs & derivatives* / Q000138:chemical synthesis* / Q000494:pharmacology; D011471:Prostatic Neoplasms / Q000188:drug therapy / Q000473:pathology; D012697:Serine Endopeptidases / Q000737:chemistry / Q000378:metabolism*; D015842:Serine Proteinase Inhibitors / Q000138:chemical synthesis* / Q000494:pharmacology; D013329:Structure-Activity Relationship; D013450:Sulfones / Q000138:chemical synthesis* / Q000494:pharmacology; D023041:Xenograft Model Antitumor Assays
D000577:Amides; D000578:Amidines; D015842:Serine Proteinase Inhibitors; D013450:Sulfones; D010649:Phenylalanine; D012697:Serine Endopeptidases; C485595:matriptase