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Related Concept Videos

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...
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Mitochondria are double-membrane organelles of the eukaryotes involved in cellular metabolism, signaling, ATP synthesis, and programmed cell death.  Each of these processes requires specific proteins and enzymes that must be correctly sorted to the right mitochondrial subcompartment for the proper functioning of the organelle.
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The transport of soluble and membrane proteins is mediated by transport vesicles that collect cargo from one cellular compartment and deliver it to another by fusing with the target organelle membrane. The Rab...
Nuclear Protein Sorting01:34

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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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Signal Sequences and Sorting Receptors01:41

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Signal sequences are short amino acid sequences that guide newly synthesized proteins to their proper location within the cell. Classical signal sequences are fifteen to sixty amino acids long and present at the N-terminus of a polypeptide chain. Each signal sequence has a conserved segment of basic residues towards their N terminus, a hydrophobic core, and a C-terminus rich in polar residues. The C-terminus also contains a signal cleavage site and features a -3 -1 sequence motif. The -3-1...
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Essential proteins such as insulin or low-density lipoprotein (LDL) and micronutrients such as iron enter a eukaryotic cell through receptor-mediated endocytosis. Subsequently, the early endosomes fuse with the vesicles containing such receptor-ligand complexes and play a vital role in sorting the incoming ligands and receptors. While the ligands are either degraded inside the vesicle or released into the cytosol, their receptors are returned to the plasma membrane for further rounds of...

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Detection of Detergent-sensitive Interactions Between Membrane Proteins
10:09

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Published on: March 7, 2018

Membrane mediated sorting.

Timon Idema1, Stefan Semrau, Cornelis Storm

  • 1Instituut-Lorentz for Theoretical Physics, Leiden University, Post Office Box 9506, 2300 RA Leiden, The Netherlands.

Physical Review Letters
|September 28, 2010
PubMed
Summary
This summary is machine-generated.

Membrane inclusions interact through physical forces, organizing biological membrane domains. These inclusions sort based on the membrane curvature they create, a finding supported by models, simulations, and experiments.

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Area of Science:

  • Biophysics
  • Cell Biology
  • Membrane Biophysics

Background:

  • Biological membranes contain various inclusions.
  • Inclusions can influence membrane shape and interact via physical forces.
  • Membrane domain organization is crucial for cellular functions.

Purpose of the Study:

  • To investigate the role of membrane shape deformations in organizing biological membrane domains.
  • To determine if physical interactions between inclusions can lead to domain organization.
  • To explore the sorting behavior of membrane inclusions based on induced curvature.

Main Methods:

  • Developed a simple analytical model to describe membrane-inclusions interactions.
  • Performed numerical simulations to verify model predictions.
  • Conducted experimental observations of phase-separated vesicles.

Main Results:

  • Predicted that membrane inclusions sort based on the curvature they impose on the membrane.
  • Verified the sorting behavior through analytical modeling.
  • Confirmed predictions with numerical simulations and experimental data.

Conclusions:

  • Physical interactions mediated by membrane deformations can organize membrane domains.
  • Inclusion sorting by induced curvature is a significant biological mechanism.
  • This physical interaction plays a vital role in membrane organization and function.