1AHT

CRYSTAL STRUCTURE OF HUMAN ALPHA-THROMBIN COMPLEXED WITH HIRUGEN AND P-AMIDINOPHENYLPYRUVATE AT 1.6 ANGSTROMS RESOLUTION

Summary for 1AHT

• Entry DOI: 10.2210/pdb1aht/pdb
• Descriptor: ALPHA-THROMBIN (SMALL SUBUNIT), ALPHA-THROMBIN (LARGE SUBUNIT), HIRUGEN, ... (5 entities in total)
• Functional Keywords: hydrolase-hydrolase inhibitor complex, hydrolase/hydrolase inhibitor
• Biological source: Homo sapiens (human); More
• Cellular location: Secreted, extracellular space: P00734 P00734
• Total number of polymer chains: 3
• Total formula weight: 35717.62

Authors

Chen, Z. (deposition date: 1995-03-17, release date: 1996-03-17, Last modification date: 2024-11-06)

Primary citation

Chen, Z.,Li, Y.,Mulichak, A.M.,Lewis, S.D.,Shafer, J.A.
Crystal structure of human alpha-thrombin complexed with hirugen and p-amidinophenylpyruvate at 1.6 A resolution.
Arch.Biochem.Biophys., 322:198-203, 1995

PubMed Abstract: Crystals of human alpha-thrombin complexed with hirugen and the alpha-keto acid thrombin inhibitor APPA (p-amidinophenylpyruvate) that diffract to 1.6 A resolution were obtained by soaking an alpha-thrombin-hirugen crystal in a solution of APPA. The crystal structure was determined using the difference Fourier method and refined to an R factor of 18.7% at 1.6 A resolution. This structure is the highest resolution structure of the thrombin molecule that is currently available. With the exception of the region near Arg77A-Asn78, the structures of the thrombin and hirugen molecules in the ternary complex are similar to those reported for the thrombin-hirugen binary complex. As previously determined for the APPA-trypsin complex, the carbonyl carbon atom of APPA forms a covalent bond with O gamma of Ser195 of thrombin to yield a "transition-state" analog of the tetrahedral intermediate. Comparison of the specificity pocket of the APPA complexes of thrombin and trypsin reveals differences in hydrogen bonding and shows for the first time that the S1 site of thrombin is larger than that of trypsin and as a result thrombin may be able to accommodate a bulkier P1 group than trypsin.

PubMed: 7574675
DOI: 10.1006/abbi.1995.1452

Experimental method

X-RAY DIFFRACTION (1.6 Å)