报告题目: Histidine kinase: the receptor of β-lactam antibiotics in Gram negative bacteria
报 告 人：Dr. Xiaohui Zhou,
Department of Pathobiology, University of Connecticut
Bacteria can produce β-lactamases, enzymes that destroy β-lactam antibiotics and thereby resist these potent antibiotics that target cell wall synthesis. Production of β-lactamases is often controlled by β-lactam-induced perturbations in the cell wall. Here, we have identified a new mechanism controlling β-lactamase production. We found a signaling system in which a membrane-associated histidine kinase directly binds β-lactams, triggering the expression of a β-lactamase and resistance to β-lactam antibiotics. Direct sensing of β-lactam antibiotics may enable sufficiently rapid induction of β-lactamase to degrade β-lactam antibiotics before the integrity of the cell wall is disturbed.