6BXZ image
Deposition Date 2017-12-19
Release Date 2018-11-28
Last Version Date 2023-10-04
Entry Detail
PDB ID:
6BXZ
Keywords:
Title:
Crystal Structure of Pig Protocadherin-15 EC10-MAD12
Biological Source:
Source Organism:
Sus scrofa (Taxon ID: 9823)
Host Organism:
Method Details:
Experimental Method:
Resolution:
2.09 Å
R-Value Free:
0.21
R-Value Work:
0.18
R-Value Observed:
0.18
Space Group:
P 1 21 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Protocadherin related 15
Chain IDs:A (auth: C), B (auth: A)
Chain Length:356
Number of Molecules:2
Biological Source:Sus scrofa
Ligand Molecules
Primary Citation
A Mechanically Weak Extracellular Membrane-Adjacent Domain Induces Dimerization of Protocadherin-15.
Biophys. J. 115 2368 2385 (2018)
PMID: 30527337 DOI: 10.1016/j.bpj.2018.11.010

Abstact

The cadherin superfamily of proteins is defined by the presence of extracellular cadherin (EC) "repeats" that engage in protein-protein interactions to mediate cell-cell adhesion, cell signaling, and mechanotransduction. The extracellular domains of nonclassical cadherins often have a large number of EC repeats along with other subdomains of various folds. Protocadherin-15 (PCDH15), a protein component of the inner-ear tip link filament essential for mechanotransduction, has 11 EC repeats and a membrane adjacent domain (MAD12) of atypical fold. Here we report the crystal structure of a pig PCDH15 fragment including EC10, EC11, and MAD12 in a parallel dimeric arrangement. MAD12 has a unique molecular architecture and folds as a ferredoxin-like domain similar to that found in the nucleoporin protein Nup54. Analytical ultracentrifugation experiments along with size-exclusion chromatography coupled to multiangle laser light scattering and small-angle x-ray scattering corroborate the crystallographic dimer and show that MAD12 induces parallel dimerization of PCDH15 near its membrane insertion point. In addition, steered molecular dynamics simulations suggest that MAD12 is mechanically weak and may unfold before tip-link rupture. Sequence analyses and structural modeling predict the existence of similar domains in cadherin-23, protocadherin-24, and the "giant" FAT and CELSR cadherins, indicating that some of them may also exhibit MAD-induced parallel dimerization.

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Primary Citation of related structures