Abstract
Histidine protein kinases and response regulators form the basis of phosphotransfer signal transduction pathways. Commonly referred to as two-component systems, these modular and adaptable signaling schemes are prevalent in prokaryotes. Structures of the core domains of histidine kinases reveal a protein kinase fold different from that of the Ser/Thr/Tyr protein kinase family, but similar to that of other ATP binding domains. Recent structure determinations of phosphorylated response regulator domains indicate a conserved mechanism for the propagated conformational change that accompanies phosphorylation of an active site Asp residue. The altered molecular surface promotes specific protein–protein interactions that mediate the downstream response.
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Acknowledgements
We thank G. Anand, K. Gunsalus, J. Hurley and C. Waldburger for comments on the manuscript and/or for providing unpublished information, and the NIH and HHMI for support.
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Robinson, V., Buckler, D. & Stock, A. A tale of two components: a novel kinase and a regulatory switch. Nat Struct Mol Biol 7, 626–633 (2000). https://doi.org/10.1038/77915
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DOI: https://doi.org/10.1038/77915
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