Using Tetracysteine-Tagged TDP-43 with a Biarsenical Dye To Monitor Real-Time Trafficking in a Cell Model of Amyotrophic Lateral Sclerosis.
Biochemistry 2019;
58:4086-4095. [PMID:
31529970 PMCID:
PMC6775541 DOI:
10.1021/acs.biochem.9b00592]
[Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
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TAR DNA-binding protein
43 (TDP-43) has been identified as the
major constituent of the proteinaceous inclusions that are characteristic
of most forms of amyotrophic lateral sclerosis (ALS) and ubiquitin
positive frontotemporal lobar degeneration (FTLD). Wild type TDP-43
inclusions are a pathological hallmark of >95% of patients with
sporadic
ALS and of the majority of familial ALS cases, and they are also found
in a significant proportion of FTLD cases. ALS is the most common
form of motor neuron disease, characterized by progressive weakness
and muscular wasting, and typically leads to death within a few years
of diagnosis. To determine how the translocation and misfolding of
TDP-43 contribute to ALS pathogenicity, it is crucial to define the
dynamic behavior of this protein within the cellular environment.
It is therefore necessary to develop cell models that allow the location
of the protein to be defined. We report the use of TDP-43 with a tetracysteine
tag for visualization using fluorogenic biarsenical compounds and
show that this model displays features of ALS observed in other cell
models. We also demonstrate that this labeling procedure enables live-cell
imaging of the translocation of the protein from the nucleus into
the cytosol.
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