5MV7 image
Entry Detail
PDB ID:
5MV7
Keywords:
Title:
Structure of human Myosin 7b C-terminal MyTH4-FERM MF2 domain
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2017-01-15
Release Date:
2017-07-05
Method Details:
Experimental Method:
Resolution:
2.44 Å
R-Value Free:
0.25
R-Value Work:
0.20
R-Value Observed:
0.21
Space Group:
C 1 2 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Unconventional myosin-VIIb
Chain IDs:A
Chain Length:522
Number of Molecules:1
Biological Source:Homo sapiens
Primary Citation
Myosin 7 and its adaptors link cadherins to actin.
Nat Commun 8 15864 15864 (2017)
PMID: 28660889 DOI: 10.1038/ncomms15864

Abstact

Cadherin linkages between adjacent stereocilia and microvilli are essential for mechanotransduction and maintaining their organization. They are anchored to actin through interaction of their cytoplasmic domains with related tripartite complexes consisting of a class VII myosin and adaptor proteins: Myo7a/SANS/Harmonin in stereocilia and Myo7b/ANKS4B/Harmonin in microvilli. Here, we determine high-resolution structures of Myo7a and Myo7b C-terminal MyTH4-FERM domain (MF2) and unveil how they recognize harmonin using a novel binding mode. Systematic definition of interactions between domains of the tripartite complex elucidates how the complex assembles and prevents possible self-association of harmonin-a. Several Myo7a deafness mutants that map to the surface of MF2 disrupt harmonin binding, revealing the molecular basis for how they impact the formation of the tripartite complex and disrupt mechanotransduction. Our results also suggest how switching between different harmonin isoforms can regulate the formation of networks with Myo7a motors and coordinate force sensing in stereocilia.

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