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Method for Efficient Refolding and Purification of Chemoreceptor Ligand Binding Domain
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The HBM domain: introducing bimodularity to bacterial sensing.

Álvaro Ortega1, Tino Krell

  • 1Department of Environmental Protection, Estación Experimental del Zaidín, Consejo Superior de Investigaciones Científicas, 18008, Granada, Spain.

Protein Science : a Publication of the Protein Society
|December 19, 2013
PubMed
Summary

Researchers identified a novel helical bimodular (HBM) domain in bacteria and archaea. This domain, found in chemoreceptors, has a unique structure suggesting it binds similar small molecules across different organisms.

Keywords:
chemotaxis receptordomain profilehistidine kinasesequence analysis

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Area of Science:

  • Microbiology
  • Structural Biology
  • Biochemistry

Background:

  • The McpS chemoreceptor sensor domain exhibits a novel bimodular architecture responsible for chemotactic responses.
  • This unique small molecule binding domain is currently un-annotated in major biological databases.

Purpose of the Study:

  • To define the domain signature for the McpS-like sensor domain family.
  • To characterize the newly identified helical bimodular (HBM) domain and its prevalence.

Main Methods:

  • Bioinformatic analysis to identify conserved domain signatures.
  • Comparative analysis of amino acid sequences within identified domains.

Main Results:

  • The helical bimodular (HBM) domain signature was identified and characterized.
  • The HBM domain was found in both Bacteria and Archaea, often as part of chemoreceptors and histidine kinases.
  • Conservation of amino acids in ligand-binding sites suggests similar ligand recognition across HBM family members.

Conclusions:

  • The HBM domain represents a novel class of small molecule binding domains.
  • Its widespread presence in prokaryotes suggests a significant role in cellular signaling.
  • Further research into HBM domain ligands could uncover new mechanisms of chemotaxis and signal transduction.