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Palmitoylation of nicotinic acetylcholine receptors.

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Acetylcholine receptor assembly: subunit folding and oligomerization occur sequentially

W N Green1, T Claudio

  • 1Department of Cellular and Molecular Physiology, Yale University School of Medicine, New Haven, Connecticut 06510.

Cell
|July 16, 1993
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Summary

Nicotinic acetylcholine receptors (AChRs) assemble through sequential subunit additions, with folding occurring at specific steps. This process reveals how subunit interactions guide receptor assembly and function.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Neuroscience

Background:

  • Nicotinic acetylcholine receptors (AChRs) are crucial for neurotransmission.
  • Understanding AChR assembly is key to deciphering receptor function and dysfunction.

Purpose of the Study:

  • To elucidate the sequential steps in nicotinic acetylcholine receptor (AChR) subunit folding and oligomerization.
  • To identify assembly intermediates and their temporal relationship to folding events.

Main Methods:

  • Utilized temperature sensitivity of Torpedo californica AChRs to isolate assembly intermediates.
  • Monitored subunit folding via alpha-bungarotoxin binding, epitope appearance, molecular weight, and detergent solubility.

Main Results:

  • Identified alpha beta gamma trimers as the earliest assembly intermediates.
  • Demonstrated sequential addition of delta and alpha subunits to form tetramers and pentamers.
  • Correlated subunit folding with specific oligomerization steps, indicating co-dependent assembly and folding.

Conclusions:

  • AChR assembly proceeds through defined intermediate stages.
  • Subunit folding is intrinsically linked to subunit addition and recognition during assembly.
  • This provides insights into the biogenesis of functional nicotinic acetylcholine receptors.