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Related Concept Videos

Protein Transport into the Inner Mitochondrial Membrane01:34

Protein Transport into the Inner Mitochondrial Membrane

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Nuclear encoded mitochondrial precursors are imported to the inner membrane in a multistep process involving two separate translocons, TIM22 and TIM23. TIM23 is a cation-selective pore that remains closed by the N terminal segment of the protein. Negative charges on the TIM23 act as a receptor for the incoming precursor, pulling the positively charged matrix-targeting sequence for peptide insertion and translocation.
Transport of mitochondrial precursors across the TIM23 channel is driven by...
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Mitochondrial Membranes01:45

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A single mitochondrion is a bean-shaped organelle enclosed by a double-membrane system. The outer membrane of mitochondria is smooth and contains many porins - the integral membrane transporters. Porins enable free diffusion of ions and small uncharged molecules through the outer mitochondrial membrane but limit the transport of molecules larger than 5000 Daltons. Further, the outer mitochondrial membrane forms a unique structure called membrane contact sites with other subcellular organelles,...
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The Inner Mitochondrial Membrane01:28

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The inner mitochondrial membrane is the primary site of ATP synthesis. The inner membrane domain that forms a smooth layer adjacent to the outer membrane is called the inner boundary membrane. This domain contains membrane transporters that drive metabolites in and out of the mitochondria.  In contrast, the inner membrane network that invaginates into the matrix space is called the cristae membrane. This domain accounts for principle mitochondrial function as it accommodates the protein...
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Insertion of Single-pass Transmembrane Proteins in the RER01:26

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Integral membrane proteins are proteins adhered to the lipid bilayer of a cell organelle or membrane. They can be of two types: transmembrane integral proteins that span the lipid bilayer and monotopic proteins that are attached to either side of the membrane but do not pass through it.
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Translocation of Proteins into the Mitochondria01:19

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Mitochondrial precursors are translocated to the internal subcompartments via independent mechanisms involving distinct protein machineries called translocases.
Sorting of outer membrane proteins:
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Insertion of Multi-pass Transmembrane Proteins in the RER01:29

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The rough ER membrane synthesizes, assembles, and embeds transmembrane proteins in diverse topologies. These proteins function as transporters or channels and can remain in the ER membrane or are sent to the Golgi complex, lysosome, and cell membrane.
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Related Experiment Video

Updated: Jan 5, 2026

Method to Visualize and Analyze Membrane Interacting Proteins by Transmission Electron Microscopy
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Method to Visualize and Analyze Membrane Interacting Proteins by Transmission Electron Microscopy

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Casting a Wider Net: Differentiating between Inner Nuclear Envelope and Outer Nuclear Envelope Transmembrane

Mark Tingey1, Krishna C Mudumbi2,3, Eric C Schirmer4

  • 1Department of Biology, Temple University, Philadelphia, PA 19121, USA. Mark.Tingey@temple.edu.

International Journal of Molecular Sciences
|October 27, 2019
PubMed
Summary

Nuclear envelope transmembrane proteins (NETs) are vital for cell function. Understanding their distribution and abundance on the nuclear envelope is crucial for cellular processes.

Keywords:
NETsinner nuclear membranenuclear envelopeouter nuclear membrane

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Single-Molecule Imaging of Nuclear Transport
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Related Experiment Videos

Last Updated: Jan 5, 2026

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Single-Molecule Imaging of Nuclear Transport
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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Genetics

Background:

  • The nuclear envelope (NE) is a double membrane surrounding the eukaryotic nucleus.
  • It contains specific transmembrane proteins (NETs) synthesized on the endoplasmic reticulum.
  • NETs are crucial for various nuclear functions, including transcription, epigenetics, and genome organization.

Purpose of the Study:

  • To review current tools and methodologies for analyzing NET distribution and abundance.
  • To highlight the importance of correct NET localization and concentration for nuclear functions.

Main Methods:

  • This review evaluates existing techniques for studying nuclear envelope transmembrane proteins.
  • Methodologies for assessing protein localization and quantification on the NE are discussed.

Main Results:

  • NETs are essential for maintaining nuclear structure, stability, and organization.
  • Accurate localization and concentration of NETs on the inner and outer nuclear membranes are critical.

Conclusions:

  • Understanding NET distribution and abundance is key to comprehending their roles in cellular function.
  • Further investigation into NETs and their associated methodologies is warranted.