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Related Concept Videos

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Nuclear Localization Signals and Import

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Proteins targeted to the nucleus carry short stretches of amino acid sequences called the nuclear localization signal or NLS. Classical nuclear localization signals are of two types: monopartite and bipartite NLS. Monopartite classical NLS (cNLS) consists of a single cluster of 4-8 amino acids. Bipartite cNLS consists of two clusters of  2-3 amino acids and a 9-12 residue long proline-rich linker bridging the two clusters. Signal clusters are rich in positively charged amino acids such as...
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Nuclear protein sorting is the selective trafficking of histones, polymerases, gene regulatory proteins into the nucleus and exporting RNAs and ribosomes to the cytosol. It is a tightly controlled process that regulates gene expression within a cell.
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Amyloid fibrils are aggregates of misfolded proteins.  Under most circumstances, misfolded proteins are either refolded by chaperone proteins or degraded by the proteasome. However, in the case of a mutation or a disease, these proteins can accumulate to form large clusters and often further assemble to form elongated fibers, called fibrils. 
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In eukaryotes, transcription and translation are compartmentalized; an mRNA is first synthesized in the nucleus and then selectively transported to the cytoplasm for protein synthesis. Before transport, a pre-mRNA undergoes several steps of post-transcriptional modifications including splicing, 5' capping, and the addition of a poly-adenine tail. Various proteins bind to the pre-mRNA during these modifications. The mRNA transport takes place with the help of multiple proteins playing...
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Related Experiment Video

Updated: Apr 16, 2026

Recombinant α- β- and γ-Synucleins Stimulate Protein Phosphatase 2A Catalytic Subunit Activity in Cell Free Assays
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Novel subcellular localization for α-synuclein: possible functional consequences.

Cristina Guardia-Laguarta1, Estela Area-Gomez2, Eric A Schon3

  • 1Departments of Pathology, Columbia University Medical Center New York, NY, USA.

Frontiers in Neuroanatomy
|March 11, 2015
PubMed
Summary

Alpha-synuclein (α-syn) dysfunction impacts mitochondria-associated membranes (MAM) in Parkinson's Disease (PD). This review explores α-syn's role in MAM and early PD pathogenesis.

Keywords:
Parkinson’s diseasealpha-synucleinendoplasmic reticulummitochondria-associated membranesphospholipid

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Molecular Biology

Background:

  • Alpha-synuclein (α-syn) mutations/overexpression are linked to Parkinson's Disease (PD).
  • Mitochondria-associated membranes (MAM) are critical ER-mitochondria interfaces regulating cellular functions.
  • MAM dysfunction is implicated in neurodegenerative diseases like Alzheimer's.

Purpose of the Study:

  • To review the role of α-syn in MAM.
  • To explore how α-syn-MAM disturbances contribute to early PD pathogenesis.

Main Methods:

  • Literature review focusing on α-syn, MAM, and PD.
  • Analysis of existing research on MAM function in PD models.

Main Results:

  • MAM function is downregulated in cell and mouse models of PD with pathogenic α-syn mutations.
  • α-syn is localized to mitochondria and potentially influences MAM composition and function.

Conclusions:

  • α-syn may play a critical role in MAM integrity and function.
  • Disturbances in α-syn-MAM interactions could represent early pathogenic events in Parkinson's Disease.