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Related Concept Videos

Molecular Chaperones and Protein Folding03:00

Molecular Chaperones and Protein Folding

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.
The...
Molecular Chaperones and Protein Folding03:00

Molecular Chaperones and Protein Folding

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.
The...
Protein Complex Assembly02:41

Protein Complex Assembly

Proteins can form homomeric complexes with another unit of the same protein or heteromeric complexes with different types.  Most protein complexes self-assemble spontaneously via ordered pathways, while some proteins need assembly factors that guide their proper assembly. Despite the crowded intracellular environment, proteins usually interact with their correct partners and form functional complexes.
Many viruses self-assemble into a fully functional unit using the infected host cell to...
Protein Complex Assembly02:41

Protein Complex Assembly

Proteins can form homomeric complexes with another unit of the same protein or heteromeric complexes with different types.  Most protein complexes self-assemble spontaneously via ordered pathways, while some proteins need assembly factors that guide their proper assembly. Despite the crowded intracellular environment, proteins usually interact with their correct partners and form functional complexes.
Many viruses self-assemble into a fully functional unit using the infected host cell to...
Globular Proteins01:27

Globular Proteins

In organisms, proteins are the most abundant macromolecules. They act as the building blocks of life and play various crucial roles in the body. Proteins can be broadly classified into two distinct subtypes based on their shape and solubilities: globular proteins and fibrous proteins.
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Accessory Structures of the Eye01:17

Accessory Structures of the Eye

Optical perception, or vision, is an extraordinary sense dependent on converting light signals received via the ocular organs. These organs, known as eyes, are securely positioned within the bony cavities of the skull, called orbits. The orbits serve a dual purpose: a protective shield for the ocular globes and a stable attachment point for the soft ocular tissues. The eye's external protective mechanisms include the eyelids, which are edged with lashes that act as a barrier against foreign...

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Related Experiment Video

Updated: Jun 21, 2026

Preparation and Immunofluorescence Staining of Bundles and Single Fiber Cells from the Cortex and Nucleus of the Eye Lens
06:08

Preparation and Immunofluorescence Staining of Bundles and Single Fiber Cells from the Cortex and Nucleus of the Eye Lens

Published on: June 9, 2023

The eye lens chaperone alpha-crystallin forms defined globular assemblies.

Jirka Peschek1, Nathalie Braun, Titus M Franzmann

  • 1Center for Integrated Protein Science and Department Chemie, Technische Universität München, Lichtenbergstrasse 4, 85747 Garching, Germany.

Proceedings of the National Academy of Sciences of the United States of America
|August 5, 2009
PubMed
Summary
This summary is machine-generated.

Alpha-crystallins are crucial molecular chaperones. This study reveals alphaB-crystallin forms defined 24-subunit oligomers, clarifying its structure and function in protein homeostasis.

Related Experiment Videos

Last Updated: Jun 21, 2026

Preparation and Immunofluorescence Staining of Bundles and Single Fiber Cells from the Cortex and Nucleus of the Eye Lens
06:08

Preparation and Immunofluorescence Staining of Bundles and Single Fiber Cells from the Cortex and Nucleus of the Eye Lens

Published on: June 9, 2023

Area of Science:

  • Biochemistry
  • Structural Biology
  • Molecular Chaperones

Background:

  • Alpha-crystallins protect eye lens proteins from aggregation.
  • AlphaB-crystallin is linked to myopathies and neuropathological diseases.
  • Quaternary structures of alpha-crystallins are poorly understood due to polydispersity.

Purpose of the Study:

  • To elucidate the quaternary structures of alpha-crystallins.
  • To investigate the assembly of alphaB-crystallin.
  • To understand the structural basis of alpha-crystallin's role in protein homeostasis.

Main Methods:

  • Biophysical methods
  • Recombinant protein expression
  • Electron microscopy
  • 3D reconstruction

Main Results:

  • AlphaB-crystallin assembles into defined oligomers of 24 subunits.
  • 3D reconstruction shows alphaB-crystallin has a sphere-like structure with internal openings.
  • AlphaA-crystallin forms 24-subunit oligomers, smaller oligomers, and large clusters, explaining polydispersity.

Conclusions:

  • AlphaB-crystallin possesses a defined oligomeric structure.
  • The structural plasticity of alphaA-crystallin contributes to the observed polydispersity of alpha-crystallins.
  • These findings advance understanding of alpha-crystallin function in protein homeostasis and disease.