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Quantification of Bacterial Histidine Kinase Autophosphorylation Using a Nitrocellulose Binding Assay
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Visualizing autophosphorylation in histidine kinases.

Patricia Casino1, Laura Miguel-Romero2, Alberto Marina3

  • 11] Department of Genomic and Proteomic, Instituto de Biomedicina de Valencia (IBV-CSIC), Jaume Roig 11, 46010 Valencia, Spain [2] Department of Structural Biology, Institut de Biología Molecular de Barcelona (IBMB-CSIC), Baldiri Reixac, 4-8, Torre R, 3era Planta, 08028 Barcelona, Spain.

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Summary
This summary is machine-generated.

This study reveals the molecular mechanism of histidine kinase autophosphorylation, a key bacterial signaling process. We determined the crystal structure of a histidine kinase dimer, uncovering a common catalytic mechanism regardless of cis or trans reaction direction.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Microbiology

Background:

  • Reversible protein phosphorylation regulates signal transduction, with histidine kinase autophosphorylation initiating bacterial two-component signaling.
  • The molecular basis of histidine kinase autophosphorylation, despite their abundance, remains largely unknown.
  • Autophosphorylation can occur in cis (intrasubunit) or trans (intersubunit) within dimeric histidine kinases.

Purpose of the Study:

  • To elucidate the molecular mechanism of histidine kinase autophosphorylation.
  • To investigate the structural and functional basis for both cis and trans autophosphorylation pathways.

Main Methods:

  • Determined the crystal structure of a chimeric histidine kinase's catalytic machinery.
  • Performed structure-guided functional analysis on HK853 and EnvZ, known cis- and trans-phosphorylating kinases.

Main Results:

  • Revealed an asymmetric dimer structure with one subunit captured during autophosphorylation.
  • Identified a common catalytic mechanism for histidine kinase autophosphorylation, irrespective of directionality.
  • Provided structural insights into the distinct cis and trans reaction pathways.

Conclusions:

  • The catalytic mechanism of histidine kinase autophosphorylation is conserved across different reaction modes.
  • Structural and functional analyses provide a unified understanding of this fundamental bacterial signaling step.
  • This work lays the foundation for understanding and potentially targeting bacterial signal transduction pathways.