X-ray structure of active site-inhibited clotting factor Xa. Implications for drug design and substrate recognition.Brandstetter, H., Kuhne, A., Bode, W., Huber, R., von der Saal, W., Wirthensohn, K., Engh, R.A.
(1996) J Biol Chem 271: 29988-29992
- PubMed: 8939944
- DOI: https://doi.org/10.1074/jbc.271.47.29988
- Primary Citation of Related Structures:
- PubMed Abstract:
The 3.0-A resolution x-ray structure of human des-Gla-coagulation factor Xa (fXa) has been determined in complex with the synthetic inhibitor DX-9065a. The binding geometry is characterized primarily by two interaction sites: the naphthamidine group is fixed in the S1 pocket by a typical salt bridge to Asp-189, while the pyrrolidine ring binds in the unique aryl-binding site (S4) of fXa. Unlike the large majority of inhibitor complexes with serine proteinases, Gly-216 (S3) does not contribute to hydrogen bond formation. In contrast to typical thrombin binding modes, the S2 site of fXa cannot be used by DX-9065a since it is blocked by Tyr-99, and the aryl-binding site (S4) of fXa is lined by carbonyl oxygen atoms that can accommodate positive charges. This has implications for natural substrate recognition as well as for drug design.
Max-Planck-Institut für Biochemie, Strukturforschung, D-82125 Martinsried, Federal Republic of Germany. firstname.lastname@example.org