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Method for Efficient Refolding and Purification of Chemoreceptor Ligand Binding Domain
14:25

Method for Efficient Refolding and Purification of Chemoreceptor Ligand Binding Domain

Published on: December 12, 2017

Direct evidence for coupling between bacterial chemoreceptors.

Ady Vaknin1, Howard C Berg

  • 1The Racah Institute of Physics, The Hebrew University, Jerusalem 91904, Israel.

Journal of Molecular Biology
|July 29, 2008
PubMed
Summary
This summary is machine-generated.

Bacterial chemoreceptors exhibit conformational coupling, where ligand binding to one receptor type influences another. This interaction is complex and not a simple direct effect, revealing nuanced communication between receptors.

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Area of Science:

  • Microbiology
  • Biophysics
  • Molecular Biology

Background:

  • Bacterial chemoreceptors form clustered trimers of homodimers.
  • Proximity is believed to enhance receptor sensitivity, dynamic range, and inter-receptor collaboration.
  • Understanding conformational coupling is key to bacterial signaling.

Purpose of the Study:

  • To investigate conformational coupling between neighboring bacterial chemoreceptor dimers.
  • To determine if ligand binding to one receptor type affects the conformation of a different, neighboring receptor type.
  • To elucidate the mechanism of inter-receptor communication in the absence of cytoplasmic components.

Main Methods:

  • Co-expression of two distinct bacterial chemoreceptor types, with one labeled with yellow fluorescent protein.
  • Independent stimulation of each receptor type with specific ligands.
  • Monitoring changes in the relative orientation of labeled receptors using fluorescence anisotropy.
  • Utilizing bacterial strains deficient in cytoplasmic taxis components to isolate receptor-level coupling.

Main Results:

  • Ligand binding to one type of bacterial chemoreceptor demonstrably alters the conformation of a neighboring, different receptor type.
  • The observed conformational changes are not identical to those induced by direct ligand binding to the second receptor type.
  • Conformational coupling between different receptor types occurs independently of cytoplasmic signaling components.

Conclusions:

  • Bacterial chemoreceptors are conformationally coupled, indicating inter-receptor communication.
  • This coupling is more complex than a simple direct effect, suggesting intricate signaling mechanisms.
  • The findings provide new insights into the sophisticated signaling networks governing bacterial chemotaxis.