T7 Phage Uses a Hyperpromiscuous Kinase to Break Through Bacterial Immunity
Bacteriophages and bacteria are locked in one of biology’s oldest evolutionary conflicts. Bacteria continually acquire new immune systems capable of detecting, blocking or destroying invading viruses, while phages evolve countermeasures that allow them to regain access to their hosts. A new study published in Nature has now revealed an unusually aggressive strategy used by bacteriophage T7: rather than precisely disabling one bacterial defence at a time, the virus releases a kinase capable of modifying an extraordinary fraction of the proteins inside the infected cell. Illustration depicting how T7 kinase, a phage enzyme, modifies many proteins inside an infected bacterium, helping shut down its defence mechanisms. Credit: Daniela Velasco/EMBL The work, led by researchers from the European Molecular Biology Laboratory in Heidelberg and collaborators, identifies the T7 protein kinase T7K, also known as gp0.7, as a remarkably broad anti-defence weapon. T7K has been known since the 1970s ...