@article{87831,
  keywords = {Models, Molecular, Protein Structure, Tertiary, phosphorylation, chemotaxis, Bacterial Proteins, signal transduction, Mutation, Escherichia coli, Mutagenesis, Membrane Proteins, Amino Acid Substitution, Amino Acid Sequence, Escherichia coli Proteins, Sequence Alignment, Methyl-Accepting Chemotaxis Proteins},
  author = {Sandra Da Re and Tatiana Tolstykh and Peter Wolanin and Jeffry Stock},
  title = {Genetic analysis of response regulator activation in bacterial chemotaxis suggests an intermolecular mechanism.},
  abstract = { Response regulator proteins of two-component systems are usually activated by phosphorylation. The phosphorylated response regulator protein CheY-P mediates the chemotaxis response in Escherichia coli. We performed random mutagenesis and selected CheY mutants that are constitutively active in the absence of phosphorylation. Although a single amino acid substitution can lead to constitutive activation, no single DNA base change can effect such a transition. Numerous different sets of mutations that activate in synergy were selected in several different combinations. These mutations were all located on the side of CheY defined by alpha4, beta5, alpha5, and alpha1. Our findings argue against the two-state hypothesis for response regulator activation. We propose an alternative intermolecular mechanism that involves a dynamic interplay between response regulators and their effector targets. },
  year = {2002},
  journal = {Protein Sci},
  volume = {11},
  pages = {2644-54},
  month = {11/2002},
  issn = {0961-8368},
  doi = {10.1110/ps.0220402},
  language = {eng},
}