Download MendeleyRegulation of LuxPQ Receptor Activity by the Quorum-Sensing Signal Autoinducer-2.
Neiditch, M.B., Federle, M.J., Miller, S.T., Bassler, B.L., Hughson, F.M.(2005) Mol Cell 18: 507-518
- PubMed: 15916958
- DOI: https://doi.org/10.1016/j.molcel.2005.04.020
- Primary Citation of Related Structures:
1ZHH - PubMed Abstract:
The extracellular signaling molecule autoinducer-2 (AI-2) mediates quorum-sensing communication in diverse bacterial species. In marine vibrios, binding of AI-2 to the periplasmic receptor LuxP modulates the activity of the inner membrane sensor kinase LuxQ, transducing the AI-2 information into the cytoplasm. Here, we show that Vibrio harveyi LuxP associates with LuxQ in both the presence and absence of AI-2. The 1.9 A X-ray crystal structure of apoLuxP, complexed with the periplasmic domain of LuxQ, reveals that the latter contains two tandem Per/ARNT/Simple-minded (PAS) folds. Thus, although many prokaryotic PAS folds themselves bind ligands, the LuxQ periplasmic PAS folds instead bind LuxP, monitoring its AI-2 occupancy. Mutations that disrupt the apoLuxP:LuxQ interface sensitize V. harveyi to AI-2, implying that AI-2 binding causes the replacement of one set of LuxP:LuxQ contacts with another. These conformational changes switch LuxQ between two opposing enzymatic activities, each of which conveys information to the cytoplasm about the cell density of the surrounding environment.
- Department of Molecular Biology, Princeton University, Princeton, New Jersey 08544, USA.
Organizational Affiliation:
