4DBB image
Entry Detail
PDB ID:
4DBB
Title:
The PTB domain of Mint1 is autoinhibited by a helix in the C-terminal linker region
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2012-01-13
Release Date:
2012-03-07
Method Details:
Experimental Method:
Resolution:
1.90 Å
R-Value Free:
0.22
R-Value Work:
0.19
R-Value Observed:
0.19
Space Group:
P 41 21 2
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Amyloid beta A4 precursor protein-binding family A member 1
Chain IDs:A
Chain Length:162
Number of Molecules:1
Biological Source:Rattus norvegicus
Primary Citation
Autoinhibition of Mint1 adaptor protein regulates amyloid precursor protein binding and processing.
Proc.Natl.Acad.Sci.USA 109 3802 3807 (2012)
PMID: 22355143 DOI: 10.1073/pnas.1119075109

Abstact

Mint adaptor proteins bind to the amyloid precursor protein (APP) and regulate APP processing associated with Alzheimer's disease; however, the molecular mechanisms underlying Mint regulation in APP binding and processing remain unclear. Biochemical, biophysical, and cellular experiments now show that the Mint1 phosphotyrosine binding (PTB) domain that binds to APP is intramolecularly inhibited by the adjacent C-terminal linker region. The crystal structure of a C-terminally extended Mint1 PTB fragment reveals that the linker region forms a short α-helix that folds back onto the PTB domain and sterically hinders APP binding. This intramolecular interaction is disrupted by mutation of Tyr633 within the Mint1 autoinhibitory helix leading to enhanced APP binding and β-amyloid production. Our findings suggest that an autoinhibitory mechanism in Mint1 is important for regulating APP processing and may provide novel therapies for Alzheimer's disease.

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