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Related Concept Videos

Protein Folding01:22

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Overview
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Molecular Chaperones and Protein Folding03:00

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The native conformation of a protein is formed by interactions between the side chains of its constituent amino acids. When the amino acids cannot form these interactions, the protein cannot fold by itself and needs chaperones. Notably, chaperones do not relay any additional information required for the folding of polypeptides; the native conformation of a protein is determined solely by its amino acid sequence. Chaperones catalyze protein folding without being a part of the folded protein.
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Introduction to Membrane Proteins01:16

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The cell membrane, or plasma membrane, is an ever-changing landscape. It is described as a fluid mosaic where various macromolecules are embedded in the phospholipid bilayer. Among the macromolecules are proteins. The protein content varies across cell types. For example, mitochondrial inner membranes contain ~76% protein content, while myelin contains ~18% protein content. Individual cells contain many types of membrane proteins—red blood cells contain over 50—and different cell...
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Mechanisms of Membrane-bending01:15

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The living membranes are flexible due to their fluid mosaic nature; however, their bending into different shapes is an active process regulated by specific lipids and proteins. The membrane bending can be transient as seen in vesicles or stable for a long time as in microvilli. Cells regulate the size, location, and duration of the membrane curvature.
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Protein Folding Quality Check in the RER01:29

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ER is the primary site for the maturation and folding of soluble and transmembrane secretory proteins. The calnexin cycle is a specific chaperone system that folds and assesses the confirmation of N-glycosylated proteins before they can exit the ER lumen. The primary players of this quality check pipeline are the lectins, ER-resident chaperones, and a glucosyl transferase enzyme. In case the calnexin system in the lumen fails to salvage a misfolded protein, it is transported to the cytoplasm...
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Multi-pass Transmembrane Proteins and β-barrels01:09

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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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Related Experiment Video

Updated: May 9, 2025

Thermodynamics of Membrane Protein Folding Measured by Fluorescence Spectroscopy
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Emerging Patterns in Membrane Protein Folding Pathways.

Sang Ah Kim1, Hyun Gyu Kim1, W C Bhashini Wijesinghe2

  • 1School of Biological Sciences and Institute of Molecular Biology and Genetics, Seoul National University, Seoul, South Korea;

Annual Review of Biophysics
|May 6, 2025
PubMed
Summary
This summary is machine-generated.

Membrane proteins fold through complex pathways influenced by lipid bilayers and evolutionary trade-offs. Advances in techniques allow detailed study of these processes, revealing how sequence optimization balances function and foldability.

Keywords:
helical hairpinmembrane protein foldingmultidomain membrane proteinsingle-molecule force spectroscopytemplated folding

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Thermodynamics of Membrane Protein Folding Measured by Fluorescence Spectroscopy
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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Structural Biology

Background:

  • Membrane protein folding studies have advanced from simple to complex systems.
  • New techniques enable high-resolution examination of folding pathways.

Purpose of the Study:

  • To explore the biophysical constraints and evolutionary strategies governing membrane protein folding.
  • To understand how sequence optimization balances functionality and foldability.

Main Methods:

  • Single-molecule force spectroscopy
  • In vivo force profiling
  • Analysis of evolutionary strategies in membrane protein sequences

Main Results:

  • Membrane protein folding is constrained by lipid bilayer viscosity and reduced TM helix hydrophobicity.
  • Folding often occurs as helical hairpins, assisted by ER chaperones.
  • Multidomain proteins exhibit allosteric networks influencing folding across domains.

Conclusions:

  • Evolutionary strategies, like domain specialization, optimize membrane protein foldability, stability, and function.
  • Despite biophysical challenges, membrane protein sequences are finely tuned for optimal performance.