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Related Concept Videos

Translocation of Proteins into the Mitochondria01:19

Translocation of Proteins into the Mitochondria

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Mitochondrial precursors are translocated to the internal subcompartments via independent mechanisms involving distinct protein machineries called translocases.
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Mitochondrial outer membrane proteins are of two types: the transmembrane, beta-barrel porins, and the membrane-anchored, alpha-helical proteins. Beta-barrel porin precursors are translocated by the TOM complex and inserted into the outer mitochondrial membrane by the SAM complex. In contrast,...
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Receptor-mediated Endocytosis01:20

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Receptor-mediated endocytosis is when bulk amounts of specific molecules are imported into a cell after binding to cell surface receptors. The molecules bound to these receptors are taken into the cell through inward folding of the cell surface membrane, which is eventually pinched off into a vesicle within the cell. Structural proteins, such as clathrin, coat the budding vesicle.
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Post-translational Translocation of Proteins to the RER01:27

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A sizable fraction of proteins destined for ER are first synthesized in the cell cytosol and then transported across the ER membrane–a process called post-translational translocation. Similar to cotranslationally translocated proteins, these proteins also use the Sec translocon complex to enter the ER lumen.
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Mitochondrial Precursor Proteins01:39

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Mitochondrial precursors are partially unfolded or loosely folded polypeptide chains. Newly synthesized precursors are inhibited from spontaneously folding into their native conformation by the cytosolic chaperones, heat shock proteins 70 (Hsp70), and mitochondrial import stimulation factors (MSFs). Precursors bound to MSFs are guided to the TOM70-TOM37 receptors, while precursors bound to Hsp70  chaperones are targetted to TOM20-TOM22 receptor complexes.
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Protein Transport into the Inner Mitochondrial Membrane01:34

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Related Experiment Video

Updated: Apr 21, 2026

In Vesiculo Synthesis of Peptide Membrane Precursors for Autonomous Vesicle Growth
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Sequence-dependent internalization of aggregating peptides.

José R Couceiro1, Rodrigo Gallardo1, Frederik De Smet1

  • 1From the Switch Laboratory, VIB, Leuven, Belgium, the Switch Laboratory, Department of Cellular and Molecular Medicine, KU Leuven, B-3000 Leuven, Belgium.

The Journal of Biological Chemistry
|November 14, 2014
PubMed
Summary
This summary is machine-generated.

Synthetic peptide aggregates with distinct properties are internalized by cells via different mechanisms, influencing proteostatic responses. Aggregate size and charge dictate uptake pathways, impacting cellular defense and disease roles.

Keywords:
AggresomeAmyloidInternalizationMolecular ChaperonePeptidePeptide TransportPrionoidProtein Aggregation

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Area of Science:

  • Cell Biology
  • Biophysics
  • Neuroscience

Background:

  • Protein aggregates are implicated in various diseases and can spread between cells.
  • Studying aggregate internalization is challenging due to complex uptake kinetics and competing mechanisms.

Purpose of the Study:

  • To design synthetic aggregating peptides with distinct properties to differentiate cellular responses to aggregate internalization.
  • To elucidate how aggregate biophysical properties influence uptake mechanisms and proteostatic machinery involvement.

Main Methods:

  • Engineered synthetic aggregating peptides with varying aggregation propensities.
  • Analyzed cellular uptake mechanisms (endocytosis, phagocytosis) based on aggregate size and charge.
  • Investigated the role of heat shock factor 1 (HSF1) and Hsp70 in aggregate internalization.

Main Results:

  • Small acidic aggregates (≤500 nm) were internalized via non-specific endocytosis, independent of HSF1.
  • Large basic aggregates (>1 μm) were internalized via phagocytosis, dependent on cytoskeletal reorganization and HSF1/Hsp70.
  • Aggregate properties dictate both internalization pathway and proteostatic response.

Conclusions:

  • The biophysical characteristics of protein aggregates are critical determinants of their cellular uptake mechanisms.
  • Aggregate internalization triggers distinct proteostatic responses, with implications for disease pathogenesis.
  • Further research is needed to understand the role of these differential responses in specific diseases.