Download MendeleyMapping the active site polarity in structures of endothelial nitric oxide synthase heme domain complexed with isothioureas.
Li, H., Raman, C.S., Martasek, P., Kral, V., Masters, B.S., Poulos, T.L.(2000) J Inorg Biochem 81: 133-139
- PubMed: 11051558
- DOI: https://doi.org/10.1016/s0162-0134(00)00099-4
- Primary Citation of Related Structures:
1D1W, 1ED4, 9NSE - PubMed Abstract:
Analyzing the active site topology and plasticity of nitric oxide synthase (NOS) and understanding enzyme-drug interactions are crucial for the development of potent, isoform-selective NOS inhibitors. A small hydrophobic pocket in the active site is identified in the bovine eNOS heme domain structures complexed with potent isothiourea inhibitors: seleno analogue of S-ethyl-isothiourea, S-isopropyl-isothiourea, and 2-aminothiazoline, respectively. These structures reveal the importance of nonpolar van der Waals contacts in addition to the well-known hydrogen bonding interactions between inhibitor and enzyme. The scaffold of a potent NOS inhibitor should be capable of donating hydrogen bonds to as well as making nonpolar contacts with amino acids in the NOS active site.
Organizational Affiliation:
Department of Molecular Biology & Biochemistry and Physiology & Biophysics and Program in Macromolecular Structure, University of California, Irvine 92697-3900, USA.
