The anticoagulant thrombin mutant W215A/E217A has a collapsed primary specificity pocket
Pineda, A.O., Chen, Z.-W., Caccia, S., Cantwell, A.M., Savvides, S.N., Waksman, G., Mathews, F.S., Di Cera, E.(2004) J Biol Chem 279: 39824-39828
- PubMed: 15252033 
- DOI: 10.1074/jbc.M407272200
- Primary Citation of Related Structures:  
1TQ0, 1TQ7 - PubMed Abstract: 
The thrombin mutant W215A/E217A features a drastically impaired catalytic activity toward chromogenic and natural substrates but efficiently activates the anticoagulant protein C in the presence of thrombomodulin. As the remarkable anticoagulant properties of this mutant continue to be unraveled in preclinical studies, we solved the x-ray crystal structures of its free form and its complex with the active site inhibitor H-d-Phe-Pro-Arg-CH(2)Cl (PPACK) ...