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Updated: Jun 3, 2026
16:33
Detection of Protein Palmitoylation in Cultured Hippocampal Neurons by Immunoprecipitation and Acyl-Biotin Exchange (ABE)
Published on: February 18, 2013
Membrane palmitoylated proteins regulate trafficking and processing of nectins.
Amanda Dudak1, Jinsook Kim, Bryan Cheong
1Department of Neuroscience, Georgetown University Medical Center, 3970 Reservoir Rd. NW, Washington, DC 20057, USA.
European Journal of Cell Biology
|March 5, 2011
Summary
Nectin cell adhesion molecules interact with membrane palmitoylated proteins (MPPs), such as MPP3. These interactions regulate nectin trafficking and cell surface expression, impacting cell-cell junction formation.
Area of Science:
- Cell Biology
- Molecular Biology
- Biochemistry
Background:
- Nectins are crucial cell-cell adhesion molecules essential for forming intercellular junctions and establishing cell polarity.
- Understanding nectin interactions with cytoplasmic partners is key to elucidating their role in junction formation.
Purpose of the Study:
- To identify novel cytoplasmic binding partners for nectins.
- To investigate the functional consequences of nectin-MPP interactions on nectin trafficking and cell surface expression.
Main Methods:
- Co-immunoprecipitation assays to detect protein-protein interactions.
- Western blotting to identify protein forms and interactions.
- Analysis of protein localization at cell-cell contact sites.
Main Results:
- Nectin-1α was found to associate with membrane palmitoylated protein 3 (MPP3), a homolog of Drosophila Disc large.
- MPP3 binding recruits nectin-1α to cell-cell contacts, increasing its cell surface expression and ectodomain shedding.
- MPP3 interaction with nectins is isoform-specific (nectin-1α and nectin-3α), while MPP5 interacts with multiple nectin isoforms.
Conclusions:
- MPP family members, including MPP3 and MPP5, interact with nectins and regulate their trafficking and processing.
- These nectin-MPP interactions are isoform-specific and play a significant role in various cell-cell junctions.
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