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Related Concept Videos

Molecular Chaperones and Protein Folding03:00

Molecular Chaperones and Protein Folding

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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.
The...
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Cooperative Allosteric Transitions01:58

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Cooperative allosteric transitions can occur in multimeric proteins, where each subunit of the protein has its own ligand-binding site. When a ligand binds to any of these subunits, it triggers a conformational change that affects the binding sites in the other subunits; this can change the affinity of the other sites for their respective ligands. The ability of the protein to change the shape of its binding site is attributed to the presence of a mix of flexible and stable segments in the...
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Gene Families01:57

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Gene families consist of groups of genes proposed to have originated from a common ancestor. Typically these arise through events in which a gene or genes are mistakenly duplicated during cell division. Unlike their parent genes (which are subject to selection pressure to maintain function), these gene copies do not need to preserve their sequences and may evolve at a relatively faster rate.
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Noncovalent Attractions in Biomolecules02:35

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Noncovalent attractions are associations within and between molecules that influence the shape and structural stability of complexes. These interactions differ from covalent bonding in that they do not involve sharing of electrons.
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Covalently Linked Protein Regulators02:04

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Proteins can undergo many types of post-translational modifications, often in response to changes in their environment. These modifications play an important role in the function and stability of these proteins. Covalently linked molecules include functional groups, such as methyl, acetyl, and phosphate groups, and also small proteins, such as ubiquitin. There are around 200 different types of covalent regulators that have been identified.
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Updated: Jul 5, 2025

Defining Hsp33's Redox-regulated Chaperone Activity and Mapping Conformational Changes on Hsp33 Using Hydrogen-deuterium Exchange Mass Spectrometry
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HspB5 Chaperone Structure and Activity Are Modulated by Chemical-Scale Interactions in the ACD Dimer Interface.

Chenwei Wang1, Lilong Teng1, Zhiyan Silvia Liu1

  • 1Program in Biochemistry, Mount Holyoke College, South Hadley, MA 01075, USA.

International Journal of Molecular Sciences
|January 11, 2024
PubMed
Summary

Small heat shock proteins (sHsps) prevent protein aggregation. Disease-linked mutations in HspB5

Keywords:
aggregationchaperonediseasemutationsprotein misfoldingsmall heat shock proteins

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Protein Folding

Background:

  • Small heat shock proteins (sHsps) are ATP-independent molecular chaperones.
  • They possess a conserved alpha-crystallin domain (ACD) and prevent protein aggregation.
  • Their dynamic structures and substrate interactions are not fully understood.

Purpose of the Study:

  • Investigate the impact of disease-associated mutations in the HspB5 ACD on chaperone activity.
  • Elucidate the physicochemical properties influencing sHsp structure and function.
  • Understand the substrate selectivity of sHsps.

Main Methods:

  • In vitro chaperone activity assays using disease-relevant HspB5 mutations (D109A, F113Y, R116C, R120G, R120C).
  • Structural analysis using ANS fluorescence and Circular Dichroism (CD) spectroscopy.
  • Light-scattering assays to evaluate substrate-sHsp interactions.

Main Results:

  • Mutation Y113F maintained efficient holdase activity.
  • Mutations D109A and R120G significantly reduced holdase activity, impacting substrate interactions.
  • Chaperone activity reduction varied among mutants and was substrate-specific, indicating selective interactions.

Conclusions:

  • Key electrostatic interactions within the sHsp dimer are crucial for structural stability.
  • These interactions influence higher-order sHsp assembly and substrate binding.
  • sHsps exhibit substrate selectivity, mediated by specific interactions defining their holdase activity.