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Annals of the New York Academy of Sciences
Article . 2003 . Peer-reviewed
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Regulation of Nicotinic Acetylcholine Receptor Assembly

Authors: Wanamaker, C; Christianson, J; Green, W;

Regulation of Nicotinic Acetylcholine Receptor Assembly

Abstract

Abstract: The four muscle‐type nicotinic acetylcholine receptor (AChR) subunits, α, β, γ, and δ, assemble into functional α2βγδ pentamers in the endoplasmic reticulum (ER) through a series of interdependent folding and oligomerization events. The first stable assembly intermediate is a trimer composed of α, β, and γ subunits. The formation of αβγ trimers initiates a series of subunit folding and processing events that allow addition of δ subunits to form αβγδ tetramers. Subunit folding and processing continue with formation of the ligand‐binding sites on the α subunit of αβγδ tetramers and the second α subunit added to assemble α2βγδ pentamers. AChR assembly is inefficient. Only 20–30% of synthesized subunits assemble into mature receptors in the ER, while the remaining unassembled subunits are degraded. However, the efficiency of subunit assembly can be regulated under certain conditions leading to higher AChR expression. Increased intracellular cAMP levels cause a 2‐ to 3‐fold increase in AChR assembly efficiency and a comparable increase in surface expression. Additionally, block of ubiquitin‐proteasome degradation appears to enhance AChR assembly and expression. Thus, the regulation of AChR assembly through posttranslational mechanisms is a potential therapeutic target for increasing AChR expression in diseases in which expression is compromised.

Country
United Kingdom
Related Organizations
Keywords

Chaperonins, Protein Conformation, Models, Neurological, Animals, Gene Expression, Humans, Receptors, Nicotinic, Endoplasmic Reticulum, Cells, Cultured

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    influence
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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
84
Top 10%
Top 10%
Top 10%
Green