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Related Experiment Videos

The cofactor-induced pre-active conformation in PhoB.

Maria Solà1, Devin L Drew, Alexandre G Blanco

  • 1Institut de Biologia Molecular de Barcelona, CSIC, Parc Científic de Barcelona, c/ Josep Samitier 1-5, 08028 Barcelona, Spain. msvcri@ibmb.csic.es

Acta Crystallographica. Section D, Biological Crystallography
|August 25, 2006
PubMed
Summary
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The PhoB receiver domain

Area of Science:

  • Microbiology
  • Structural Biology
  • Biochemistry

Background:

  • PhoB is a key transcription factor in Escherichia coli's two-component signal transduction system.
  • It regulates gene expression in response to environmental phosphate levels.
  • PhoB activation requires phosphorylation of its receiver domain (RD) and Mg(2+) binding.

Purpose of the Study:

  • To elucidate the structural basis of PhoB RD activation.
  • To investigate the role of Mg(2+) binding in PhoB RD structure and function.
  • To understand the structural dynamics influencing PhoB activation.

Main Methods:

  • X-ray crystallography was used to determine the structure of the PhoB RD in complex with Mg(2+).
  • Analysis of protomer interactions and cation binding sites within the asymmetric unit.

Related Experiment Videos

  • Comparative structural analysis with unliganded and activated PhoB states.

    • Main Results:

    • The structure reveals three PhoB RD protomers interacting across distinct surfaces.
    • Mg(2+) binding is conserved, but interactions at the phosphate-binding site vary.
    • The presence of Trp54 at the active site destabilizes helix alpha4, inducing flexibility.
    • This flexibility in helix alpha4 may facilitate the helical shift observed upon activation.

    Conclusions:

    • The PhoB RD structure provides insights into Mg(2+) -dependent activation mechanisms.
    • Structural flexibility at helix alpha4, influenced by specific residues, is crucial for activation.
    • Understanding these dynamics can inform the design of modulators for bacterial signal transduction.