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Related Concept Videos

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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Protein Transport into the Inner Mitochondrial Membrane01:34

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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.
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The translocon complex situated on the ER membrane is the main gateway for the protein secretory pathway. It facilitates the transport of nascent peptides into the ER lumen and their insertion into the ER membrane.
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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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Porin Insertion in the Outer Mitochondrial Membrane01:12

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Porins are beta-barrel proteins translocated to the mitochondrial outer membrane through the TOM complex into the intermembrane space. Porin precursors bind TIM chaperones within the intermembrane space and are guided to the Sorting and Assembly Machinery complex or SAM complex on the outer mitochondrial membrane.
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Membrane Asymmetry Regulating Transporters

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Enzymes like flippase, floppase, and scramblase transfer phospholipids from one layer to another in the membrane, thereby affecting membrane asymmetry.
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Updated: Nov 20, 2025

Förster Resonance Energy Transfer Mapping: A New Methodology to Elucidate Global Structural Features
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A flip turn for membrane protein insertion.

Sichen Shao1, Ramanujan S Hegde

  • 1Cell Biology and Metabolism Program, National Institutes of Child Health and Human Development, National Institutes of Health, Bethesda, MD 20892, USA.

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Summary
This summary is machine-generated.

Newly identified membrane protein biogenesis steps reveal a flexible insertion machinery. This study provides snapshots of protein insertion into the lipid bilayer, enhancing our understanding of membrane protein assembly.

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Last Updated: Nov 20, 2025

Förster Resonance Energy Transfer Mapping: A New Methodology to Elucidate Global Structural Features
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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Background:

  • Membrane proteins require precise recognition and orientation of transmembrane domains for insertion into the lipid bilayer.
  • Understanding the mechanisms of membrane protein biogenesis is crucial for cellular function and disease research.

Discussion:

  • The study by Devaraneni et al. (2011) visualizes membrane protein biogenesis at various stages.
  • These snapshots highlight a dynamic process, challenging previous notions of a rigid insertion machinery.

Key Insights:

  • The membrane insertion machinery exhibits unexpected flexibility during protein biogenesis.
  • The findings suggest a more adaptable mechanism for integrating transmembrane domains into the lipid bilayer.

Outlook:

  • Further research can explore the specific components and dynamics of this flexible machinery.
  • This work may inform strategies for engineering membrane proteins or understanding misfolding-related diseases.