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Related Concept Videos

Insertion of Single-pass Transmembrane Proteins in the RER01:26

Insertion of Single-pass Transmembrane Proteins in the RER

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.
Integral transmembrane proteins possess transmembrane and extra membrane domains. The transmembrane domains are primarily made of 20-25 hydrophobic amino acids arranged in a helical secondary confirmation. These...
Insertion of Multi-pass Transmembrane Proteins in the RER01:29

Insertion of Multi-pass Transmembrane Proteins in the RER

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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Introduction to Membrane Traffic01:44

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Introduction to Membrane Traffic01:44

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Mitochondrial Protein Sorting

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.
Most of these mitochondrial proteins are encoded by the nucleus and imported to the mitochondria as unfolded or loosely folded precursors. Mitochondrial precursors...
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Tail-anchored, or TA, proteins are estimated to make up to 3-5% of membrane proteins found in the eukaryotic cell. Such proteins have a single transmembrane domain located approximately 30 amino acid residues upstream from the C-terminal end. As a result, the signal recognition particle (SRP) cannot guide a TA protein to the ER membrane for cotranslational insertion. Hence, they are integrated into the ER membrane post-translationally using their C-terminal end as the anchor. TA proteins...

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Membrane Protein Insertion in Cells: Principles, Pathways, and Quality Control.

Hadas Peled-Zehavi1, Reut Yemini1, Nir Fluman1

  • 1Department of Biomolecular Sciences, Weizmann Institute of Science, 234 Herzl St. PO Box 26, Rehovot 7610001, Israel.

Chemical Reviews
|May 28, 2026
PubMed
Summary

Cellular machinery guides integral membrane proteins into the correct membrane for proper function. This review details how sequence features and cellular systems ensure accurate protein insertion and correct misinsertions.

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Area of Science:

  • Cellular biology
  • Biochemistry
  • Molecular biology

Background:

  • Integral membrane proteins are essential components of cell membranes, comprising at least 25% of proteomes.
  • Proper insertion and topology are critical for protein function, but cellular insertion is complex and not spontaneous.
  • Challenges include crowded cellular environments, correct membrane targeting, and handling difficult transmembrane sequences.

Purpose of the Study:

  • To review the principles governing membrane protein insertion in cells.
  • To explain the interaction between transmembrane sequence features and cellular insertion machinery.
  • To highlight bacterial and eukaryotic insertion systems and their adaptability.

Main Methods:

  • Review of existing literature on membrane protein biogenesis.
  • Analysis of sequence features influencing membrane protein insertion.
  • Comparison of major insertion systems in prokaryotes and eukaryotes.

Main Results:

  • Membrane protein insertion relies on dedicated cellular systems that direct, mediate, and monitor the process.
  • Transmembrane sequence properties dictate interactions with insertion machineries.
  • Pathways accommodate diverse protein architectures, from single-pass to multispanning proteins.
  • Cells possess mechanisms to detect and resolve misinserted proteins.

Conclusions:

  • Membrane protein insertion is a coordinated, adaptable, and safeguarded cellular process.
  • The interplay between protein sequence, membrane environment, and machinery ensures proteome integrity.
  • Understanding these mechanisms is key to comprehending cellular function and disease.