Crystals of the urokinase type plasminogen activator variant beta(c)-uPAin complex with small molecule inhibitors open the way towards structure-based drug design.
Urokinase is a serine protease involved in cancer growth and metastasis. Here we present the first urokinase crystal structure in complex with reversible inhibitors at 2.1 and 2.6 A resolution. These inhibitor complex structures have been obtained from crystals of engineered urokinase type plasminogen activator designed to obtain a crystal form open for inhibitor soaking. The mutant C122S loses its flexible A-chain upon activation cleavage and crystallizes in the presence of benzamidine, which was later displaced by the desired inhibitor. This new soakable crystal form turned out to be of great value in the process of structure-based drug design. The evaluated binding mode of amiloride, and UKI-1D revealed a new subsite of the primary specificity pocket of urokinase that will be employed in the future ligand optimisation process.
Zeslawska
E
E
Max-Planck-Institut für Biochemie, Abteilung Strukturforschung, Martinsried, Am Klopferspitz 18a, D-82152, Germany.
Schweinitz
A
A
Karcher
A
A
Sondermann
P
P
Sperl
S
S
Stürzebecher
J
J
Jacob
U
U
D000584:Amiloride / Q000737:chemistry; D000595:Amino Acid Sequence; D001550:Benzamidines / Q000737:chemistry; D018360:Crystallography, X-Ray; D015195:Drug Design; D008958:Models, Molecular; D008969:Molecular Sequence Data; D016297:Mutagenesis, Site-Directed; D016415:Sequence Alignment; D015842:Serine Proteinase Inhibitors / Q000737:chemistry*; D013329:Structure-Activity Relationship; D014357:Trypsin / Q000737:chemistry; D014568:Urokinase-Type Plasminogen Activator / Q000737:chemistry*
D001550:Benzamidines; D015842:Serine Proteinase Inhibitors; D000584:Amiloride; D014357:Trypsin; D014568:Urokinase-Type Plasminogen Activator; C032157:benzamidine