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Related Concept Videos

ER Retrieval Pathway01:45

ER Retrieval Pathway

In the secretory pathway, vesicles transport proteins from one cellular compartment to another in forward transport to deliver the protein to its correct location. Occasionally, misfolded proteins and incorrect proteins escape their original compartments, and a retrieval pathway is used to return the escaped proteins to their original compartment.
The ER uses many checkpoints to prevent the entry of incorrectly folded or a resident protein as cargo onto a transport vesicle. These mechanisms...
Regulation of Nuclear Protein Sorting01:45

Regulation of Nuclear Protein Sorting

Nuclear protein sorting regulates nucleus composition and gene expression, crucial for determining the fate of a eukaryotic cell. Hence, the entry and exit of molecules across the nuclear envelope is a tightly controlled process. Nuclear protein sorting can be inhibited by one of the following ways: 1) masking cargo signal sequences, 2) modifying the nuclear receptor's affinity for cargo, 3) controlling the nuclear pore size, 4) retaining the cargo during its transit to the cytosol or the...
Overview of Protein Sorting and Transport01:45

Overview of Protein Sorting and Transport

Eukaryotic cells have different membrane-bound organelles with distinct protein requirements. The process by which proteins are targeted to a specific organelle is called protein sorting.
Protein sorting can be of two types: signal-based sorting and vesicle-based trafficking. In signal-based sorting, specific amino acid sequences called sorting signals target proteins to the proper location inside the cell either via gated transport or by protein translocation.  In gated transport, folded...
Overview of Secretory Vesicles01:33

Overview of Secretory Vesicles

Secretory vesicles, also known as dense core vesicles (DCVs), are membrane-bound vesicles that transport secretory proteins, such as hormones or neurotransmitters. Regulated secretory vesicles transport proteins from the trans-Golgi network to the exterior of the cell. Proteins present in regulated secretory vesicles are required to be rapidly exocytosed in large amounts upon a specific stimulus.
Various proteins regulate the aggregation of molecules inside the secretory vesicles. Chromogranins...
Nuclear Protein Sorting01:34

Nuclear Protein Sorting

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.
Proteins targeted to the nucleus carry nuclear localization signals or NLS recognized by import receptors in the cytosol. Similarly, proteins with nuclear export signals are recognized by export receptors. Import and export receptors are...
Vesicular Tubular Clusters01:45

Vesicular Tubular Clusters

After budding out from the ER membrane, some COPII vesicles lose their coat and fuse with one another to form larger vesicles and interconnected tubules called vesicular tubular clusters or VTCs. These clusters constitute a compartment at the ER-Golgi interface known as ERGIC (Endoplasmic Reticulum Golgi Intermediate Compartment). The ERGIC is a mobile membrane-bound cargo transport system that sorts proteins secreted from ER and delivers them to the Golgi.
With the help of motor proteins such...

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Related Experiment Video

Updated: Jul 7, 2026

Adenofection: A Method for Studying the Role of Molecular Chaperones in Cellular Morphodynamics by Depletion-Rescue Experiments
12:34

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Published on: September 16, 2016

Subcellular distribution affects BAG1 function.

Jan Liman1, Lena Faida, Christoph P Dohm

  • 1Department of Neurology, University of Göttingen, Germany.

Brain Research
|February 5, 2008
PubMed
Summary
This summary is machine-generated.

The anti-apoptotic protein BAG1 (Bcl2-associated athanogene 1) requires cytosolic localization for neuroprotection and neuronal differentiation. Nuclear BAG1 prevents these crucial functions by inhibiting Hsp70 interaction and MAPK activation.

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Last Updated: Jul 7, 2026

Adenofection: A Method for Studying the Role of Molecular Chaperones in Cellular Morphodynamics by Depletion-Rescue Experiments
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Published on: February 21, 2019

Area of Science:

  • Neuroscience
  • Cell Biology
  • Molecular Biology

Background:

  • The anti-apoptotic protein BAG1 (Bcl2-associated athanogene 1) is a key regulator of neuronal development and survival.
  • BAG1's subcellular localization, predominantly nuclear during development and shifting to the cytosol upon differentiation, suggests distinct functional roles.
  • Understanding BAG1's localization-dependent functions is crucial for elucidating neuroprotective and differentiation mechanisms.

Purpose of the Study:

  • To investigate the role of BAG1's subcellular localization in its neuroprotective and differentiation-promoting functions.
  • To determine if nuclear localization of BAG1 compromises its interaction with Hsp70 and subsequent neuroprotection.
  • To examine the impact of exclusively nuclear BAG1 on neuronal differentiation and MAPK pathway activation.

Main Methods:

  • Forced expression of BAG1 variants with restricted subcellular localization (nuclear vs. full-length).
  • Assessment of neuroprotective effects using cell viability assays.
  • Analysis of neuronal differentiation markers and post-mitotic status.
  • Quantification of signaling pathway components, including phospho-Erk and Raf-dependent MAPK activation.

Main Results:

  • Forced nuclear expression of BAG1 completely abolished its neuroprotective effects, unlike full-length BAG1.
  • Nuclear BAG1 prevented neuronal differentiation into post-mitotic neurons.
  • Phospho-Erk levels were significantly decreased in cells with exclusively nuclear BAG1.
  • These findings support the necessity of BAG1's cytosolic interaction with Hsp70 for neuroprotection and its translocation to the cytosol for Raf-dependent MAPK activation.

Conclusions:

  • Cytosolic localization of BAG1 is mandatory for its neuroprotective activity, mediated through interaction with Hsp70.
  • BAG1 must translocate to the cytosol to facilitate neuronal differentiation and MAPK pathway activation.
  • Subcellular localization is a critical determinant of BAG1's diverse functions in neuronal cells.