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Receiver domain structure and function in response regulator proteins.

Robert B Bourret1

  • 1Department of Microbiology & Immunology, University of North Carolina, Chapel Hill, NC 27599-7290, USA. bourret@med.unc.edu

Current Opinion in Microbiology
|March 10, 2010
PubMed
Summary
This summary is machine-generated.

Response regulators (RRs) are key to signal transduction. Their receiver domains act as switches, often controlled by phosphorylation, with conserved sequences dictating structure and function.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Structural Biology

Background:

  • Two-component regulatory systems are crucial for signal transduction.
  • Sensor kinases and response regulators (RRs) mediate cellular responses.
  • Receiver domains within RRs typically function as phosphorylation-dependent switches.

Purpose of the Study:

  • To explore the structure-function relationships of receiver domains.
  • To investigate the catalytic mechanisms of receiver domain phosphorylation and dephosphorylation.
  • To understand the factors influencing receiver domain specificity and reaction rates.

Main Methods:

  • Analysis of conserved amino acid sequences and their correlation with structure.
  • Molecular dynamics simulations to study conformational changes.
  • Biochemical assays to investigate phosphorylation and dephosphorylation reactions.

Main Results:

  • Conserved sequence features predict receiver domain structure and function.
  • Receiver domains self-catalyze phosphorylation/dephosphorylation reactions requiring divalent cations.
  • Molecular dynamics simulations reveal conformational changes underlying switch function.
  • Atypical and pseudo-receiver domains functioning without phosphorylation have been identified.

Conclusions:

  • Receiver domain structure and function are intrinsically linked to conserved sequence motifs.
  • Understanding these domains provides insights into signal transduction pathways.
  • Emerging atypical domains expand the known functional repertoire of receiver domains.