An essential sensor histidine kinase controlled by transmembrane helix interactions with its auxiliary proteins
- 15 April 2008
- journal article
- Published by Proceedings of the National Academy of Sciences in Proceedings of the National Academy of Sciences of the United States of America
- Vol. 105 (15), 5891-5896
- https://doi.org/10.1073/pnas.0800247105
Abstract
Two-component signal transduction systems with membrane-embedded sensor histidine kinases are believed to recognize environmental signals and transduce this information over the cellular membrane to influence the activity of a transcription factor to which they are mated. The YycG sensor kinase of Bacillus subtilis, containing two transmembrane helices, is subject to a complicated activity-control circuit involving two other proteins with N-terminal transmembrane helices, YycH and YycI. Truncation studies of YycH and YycI demonstrated that the individual transmembrane helices of these proteins are sufficient to adjust YycG activity, indicating that this control is achieved at the membrane level. A replica exchange molecular dynamics computational approach generated in silico structural models of the transmembrane helix complex that informed mutagenesis studies of the YycI transmembrane helix supporting the accuracy of the in silico model. The results predict that signal recognition by any of the extracellular domains of the sensor histidine kinase YycG or the associated proteins YycH and YycI is transmitted across the cellular membrane by subtle alterations in the positions of the helices within the transmembrane complex of the three proteins.Keywords
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