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Method for Efficient Refolding and Purification of Chemoreceptor Ligand Binding Domain
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Engineering a prokaryotic Cys-loop receptor with a third functional domain.

Raman Goyal1, Ahmed Abdullah Salahudeen, Michaela Jansen

  • 1Department of Cell Physiology and Molecular Biophysics, School of Medicine, Texas Tech University Health Sciences Center, Lubbock, Texas 79430, USA.

The Journal of Biological Chemistry
|August 17, 2011
PubMed
Summary
This summary is machine-generated.

Researchers added the intracellular domain (ICD) from a human serotonin receptor to a prokaryotic ion channel. This study demonstrates the intracellular domain

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Area of Science:

  • Neuroscience and Molecular Biology
  • Ion Channel Research
  • Prokaryotic and Metazoan Receptor Structure-Function Relationships

Background:

  • Cys-loop receptors, previously known only in metazoans, have been identified in prokaryotes.
  • Prokaryotic Cys-loop receptors possess extracellular and transmembrane domains but lack the large intracellular domain (ICD) found in metazoan receptors.
  • Understanding the role and modularity of the ICD in receptor function is crucial.

Purpose of the Study:

  • To investigate the functional integration of a metazoan intracellular domain (ICD) into a prokaryotic Cys-loop receptor.
  • To determine if the prokaryotic Gloeobacter violaceus ligand-gated ion channel (GLIC) can accommodate and utilize a mammalian serotonin receptor ICD.
  • To assess the structural and functional impact of adding the ICD to the prokaryotic receptor.

Main Methods:

  • A chimera approach was employed, creating 12 variants by inserting the 115-amino acid ICD from the mammalian serotonin type 3A receptor (5-HT(3A)) into the GLIC M3M4 linker.
  • Functional expression of these GLIC-5-HT(3A)-ICD chimeras was assessed in Xenopus laevis oocytes using two-electrode voltage clamp recordings.
  • The influence of the chaperone protein RIC-3 on chimera expression was evaluated to confirm proper protein folding.

Main Results:

  • Two of the 12 created GLIC-5-HT(3A)-ICD chimeras exhibited functional proton-activated currents upon acidification, with pH(50) values comparable to wild-type GLIC.
  • Co-expression with RIC-3 inhibited the expression of the functional chimeras, mirroring its effect on native 5-HT(3A) receptors and indicating correct ICD folding.
  • The extracellular and transmembrane domains of GLIC maintained their structure and function despite the addition of the heterologous ICD.

Conclusions:

  • The intracellular domain (ICD) can be functionally integrated into prokaryotic Cys-loop receptors, suggesting domain modularity.
  • The ICD acts as a separable functional unit that can be added to or removed from the extracellular and transmembrane domains without compromising core receptor function.
  • This study provides novel insights into the evolutionary divergence and structural plasticity of Cys-loop ligand-gated ion channels across different life forms.