MERS Enzyme Behavior Graphic (IMAGE) Purdue University Caption A kinetic model outlines the behavior of MERS 3C-like protease in the presence and absence of molecules to bind to a target site. A Purdue University-led team found that at low concentrations an inhibitor activated the protease, but at higher concentrations it successfully blocked the activity of this essential viral enzyme. Credit (Purdue University image/courtesy of Mesecar Research Laboratory) Usage Restrictions For non-commercial use only. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.