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In multi-pass transmembrane proteins, the polypeptide chain crosses the membrane more than once. The transmembrane polypeptide chain either forms an α-helix or β-strand structure. α-Helix containing multi-pass transmembrane proteins are ubiquitous, whereas β-strand containing ones are mainly found in gram-negative bacteria, mitochondria, and chloroplasts.
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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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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 Translocation Machinery on the ER Membrane01:28

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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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G-protein Coupled Receptors01:21

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G-protein coupled receptors are ligand binding receptors that indirectly affect changes in the cell. The actual receptor is a single polypeptide that transverses the cell membrane seven times creating intracellular and extracellular loops. The extracellular loops create a ligand specific pocket which binds to neurotransmitters or hormones. The intracellular loops holds onto the G-protein.
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The organelle-specific signaling sequences direct proteins synthesized in the cytosol to their final destination like ER, mitochondria, peroxisomes, etc. Some of the proteins directed to ER are then trafficked via vesicles to other organelles within the cell or the extracellular environment through the Golgi complex. For example, the rough ER synthesizes soluble proteins for transportation to the lysosomes or secretion out of the cell. It can also synthesize transmembrane proteins that can...
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Related Experiment Video

Updated: Oct 27, 2025

Transmembrane Domain Oligomerization Propensity determined by ToxR Assay
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Interface Prediction for GPCR Oligomerization Between Transmembrane Helices.

Wataru Nemoto1,2, Akira Saito3,4

  • 1Division of Life Science, Department of Science and Engineering, School of Science and Engineering, Tokyo Denki University (TDU), Tokyo, Japan. watarunemoto@gmail.com.

Methods in Molecular Biology (Clifton, N.J.)
|July 24, 2021
PubMed
Summary
This summary is machine-generated.

Predicting G protein-coupled receptor (GPCR) oligomerization interfaces is crucial for understanding their function. A new method identifies conserved residue clusters on transmembrane helices to predict these critical interaction sites.

Keywords:
Conserved residuesMembrane proteinsTransmembrane helices

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Author Spotlight: A Computational Approach to Decipher Amino Acid Preferences in Multispecific Protein-Protein Interactions
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Area of Science:

  • Biochemistry and Molecular Biology
  • Structural Biology
  • Computational Biology

Background:

  • Oligomerization of G protein-coupled receptors (GPCRs) is fundamental to their biological functions and has been evolutionarily conserved.
  • The precise mechanisms and reasons behind GPCR self-interaction remain largely unknown.
  • Understanding GPCR interactions is vital for drug development and deciphering signaling pathways.

Purpose of the Study:

  • To develop and present a novel computational method for predicting the interfaces involved in GPCR oligomerization.
  • To facilitate the design of targeted mutation and inhibition experiments.
  • To accelerate research into the molecular mechanisms governing GPCR oligomerization and signal transduction.

Main Methods:

  • The developed method utilizes multiple sequence alignments to identify conserved residue clusters.
  • Analysis focuses on the surfaces of transmembrane helices within a target GPCR or a structurally related protein.
  • The approach aims to pinpoint residues likely involved in mediating receptor-receptor interactions.

Main Results:

  • The study successfully outlines a method for predicting GPCR oligomerization interfaces.
  • Identified conserved residue clusters serve as potential indicators of interaction sites.
  • The approach leverages evolutionary conservation to infer structural and functional relationships.

Conclusions:

  • The presented method offers a valuable tool for investigating GPCR oligomerization.
  • Accurate interface prediction can guide experimental strategies and deepen mechanistic understanding.
  • Future work aims to extend this methodology for predicting interfaces in broader classes of membrane proteins.