New inhibitors of thrombin and other trypsin-like proteases: hydrogen bonding of an aromatic cyano group with a backbone amide of the P1 binding site replaces binding of a basic side chain.
Lee, S.L., Alexander, R.S., Smallwood, A., Trievel, R., Mersinger, L., Weber, P.C., Kettner, C.(1997) Biochemistry 36: 13180-13186
- PubMed: 9341205 
- DOI: 10.1021/bi970912m
- Primary Citation of Related Structures:  
1AUJ - PubMed Abstract: 
Highly effective thrombin inhibitors have been obtained by preparing boronic acid analogues of m-cyano-substituted phenylalanine and its incorporation into peptides. The cyano group enhances binding by several orders of magnitude. For example, Ac-(D)Phe-Pro-boroPheOH binds to thrombin with a Ki of 320 nM and the Ki of Ac-(D)Phe-Pro-boroPhe(m-CN)-OH is 0 ...