The Enzyme PpnN Binds pppGpp (IMAGE) Aarhus University Caption The figure shows how the enzyme PpnN binds pppGpp and speeds up conversion of guanylate (GMP) to its constituents ribose-5-phosphate and guanine. This enables bacteria to balance their tolerance towards antibiotics with the fitness requirements for survival (below). Credit Ditlev E. Brodersen/AU Usage Restrictions Image may be used only to illustrate the research described in the accompanying release. 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.