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Bead Aggregation Assays for the Characterization of Putative Cell Adhesion Molecules

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Published on: October 17, 2014

Structural elements necessary for oligomerization, trafficking, and cell sorting function of paraxial protocadherin.

Xuejun Chen¹, Caitlyn Molino, Li Liu

¹Department of Cell Biology, University of Virginia Health Sciences Center, Charlottesville, Virginia 22908, USA.

The Journal of Biological Chemistry

|September 8, 2007

Summary

Xenopus paraxial protocadherin (PAPC) forms disulfide-bonded oligomers essential for its cell sorting function. Disrupting these oligomers impairs PAPC

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Transmembrane Domain Oligomerization Propensity determined by ToxR Assay

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Area of Science:

Molecular and Cellular Biology
Developmental Biology
Biochemistry

Background:

Protocadherins are crucial for embryonic and central nervous system development, regulating cell adhesion, migration, survival, and morphogenesis.
The precise mechanisms underlying protocadherin function remain largely unknown.
Previous research demonstrated Xenopus paraxial protocadherin (PAPC) mediates cell sorting and morphogenesis by modulating classical cadherin activity.

Purpose of the Study:

To investigate the role of protein oligomerization in protocadherin function.
To elucidate the molecular mechanisms by which PAPC mediates cell sorting and morphogenesis.

Main Methods:

Investigated PAPC oligomerization using disulfide bond disruption (dithiothreitol) and cysteine residue mutation.
Assessed the impact of disrupted oligomerization on PAPC post-translational modification, cell surface trafficking, and cell sorting.
Determined the functional importance of different PAPC domains (cytoplasmic, transmembrane, extracellular) in cell sorting.

Main Results:

PAPC forms oligomers stabilized by disulfide bonds between conserved extracellular cysteine residues.
Disruption of these disulfide bonds or mutations in cysteine residues led to impaired PAPC oligomerization, post-translational modification, cell surface trafficking, and cell sorting.
The extracellular and transmembrane domains, but not the cytoplasmic domain, of PAPC are essential for its cell sorting activity.

Conclusions:

Protein oligomerization, mediated by disulfide bonds in the extracellular domain, is critical for PAPC function.
Interactions involving the extracellular and transmembrane domains of PAPC are necessary for its role in cell sorting.
These findings reveal a novel mechanism for protocadherin-mediated cell adhesion and morphogenesis.