Zhao-Qing Luo, Purdue University (IMAGE) Purdue University Caption Zhao-Qing Luo, at right, a Purdue professor of biological sciences and member of the Purdue Institute for Inflammation, Immunology and Infectious Diseases, and postdoctoral researcher Jiazhang Qiu look at a petri dish with Legionella pneumophila bacteria. Luo and Qiu lead a research team that identified an enzyme that could independently accomplish ubiquitination, an important cellular signaling process being pursued as a therapeutic target. Credit (Purdue University photo/Charles Jischke) 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.