2N4G image
Entry Detail
PDB ID:
2N4G
Title:
Solution Structure of the G335D Mutant of TDP-43 Amyloidogenic Core Region
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2015-06-17
Release Date:
2016-04-20
Method Details:
Experimental Method:
Conformers Calculated:
200
Conformers Submitted:
10
Selection Criteria:
structures with the lowest energy
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:TAR DNA-binding protein 43
Chain IDs:A
Chain Length:50
Number of Molecules:1
Biological Source:Homo sapiens
Ligand Molecules
Primary Citation
Two mutations G335D and Q343R within the amyloidogenic core region of TDP-43 influence its aggregation and inclusion formation
Sci Rep 6 23928 23928 (2016)
PMID: 27030292 DOI: 10.1038/srep23928

Abstact

TDP-43 is a DNA/RNA binding protein associated with TDP-43 proteinopathies. Many mutations have been identified in the flexible C-terminal region, which is implicated in the disease pathology. We investigated four point mutations in the amyloidogenic core region (residues 311-360) of TDP-43 by biochemical and spectroscopic methods. We found that the G335D mutation enhances the aggregation and inclusion formation of TDP-43 and this mutant in TDP-35 (the C-terminal fragment of 35 kDa) exaggerates the antagonist effect on RNA processing by endogenous TDP-43; whereas Q343R gives an opposite effect. As a comparison, M337V and Q331K have very little impact on the aggregation and inclusion formation of TDP-43 or TDP-35. NMR structural analysis showed that the G335D mutant in the core region forms a loop linker between the two α-helices and promotes α-to-β transition, but Q343R loses the second helix and consequently the structural transformation. Thus, the propensity of structural transformation in the amyloidogenic core of TDP-43 determines its aggregation and inclusion formation. This study may provide a molecular mechanism of the TDP-43 proteinopathies caused by genetic mutations.

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Primary Citation of related structures