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Related Concept Videos

Cytoskeletal Accessory Proteins01:13

Cytoskeletal Accessory Proteins

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The cytoskeleton is an essential cell component that plays several structural and functional roles. However, the filaments that make up the cytoskeleton cannot function independently and depend on the accessory or ancillary proteins to effectively carry out their function. Accessory proteins associate with cytoskeletal filaments and their monomers, aiding filament formation and function. They also help in the cross-communication among cytoskeletal filaments. Cytoskeletal accessory proteins are...
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Role of Septins01:02

Role of Septins

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Septins are the recently discovered fourth major protein component of the cytoskeleton, along with microfilaments, microtubules, and intermediate filaments. These proteins can associate with other cytoskeletal filaments and carry out varied roles or can be free-floating in the cytoplasm.
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The Sarcomere01:08

The Sarcomere

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A sarcomere is a microscopic segment repeating in a myofibril. The sarcomere fundamentally consists of two main myofilaments: thick filaments called myosin and thin filaments called actin. These filaments interact by sliding past each other in response to stimulus. In addition to myosin and actin, several other proteins, such as tropomyosin, troponin, titin, nebulin, myomesin, α-actinin, and dystrophin, play crucial roles in regulating, structuring, and functioning of the sarcomere.
Each...
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Assembly of Signaling Complexes01:30

Assembly of Signaling Complexes

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Multiprotein signaling complexes are formed in a dynamic process involving protein-protein interactions at the cytoplasmic domain of transmembrane receptors or enzymatic and non-enzymatic proteins associated with the receptor. These complexes ensure the activation and propagation of intracellular signals that regulate cell functions.
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Protein Complexes with Interchangeable Parts01:57

Protein Complexes with Interchangeable Parts

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Groups of proteins may form a complex where each protein in this complex has a different role in the overall execution of the complex’s function. Often some of the proteins in the complex can be replaced by a closely related variant to give a complex that contains many of the same components yet is functionally distinct.
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Cytoskeletal Coordination in Cell Migration01:32

Cytoskeletal Coordination in Cell Migration

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A migrating cell changes its shape during the cyclic events of attachment and detachment from the substratum and repositions the cell organelles correspondingly. These complex events are orchestrated by the dynamic cytoskeletal network comprising actin filaments, intermediate filaments, and microtubules. Cytoskeletal crosstalk — the direct and indirect communication between the different components — is crucial for this coordination. Direct communication involves various linker...
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Related Experiment Video

Updated: Dec 7, 2025

Purification and Quality Control of Recombinant Septin Complexes for Cell-Free Reconstitution
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Purification and Quality Control of Recombinant Septin Complexes for Cell-Free Reconstitution

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Multiple Functions of Spectrin: Convergent Effects.

Dipayan Bose1,2, Abhijit Chakrabarti3,4

  • 1Crystallography & Molecular Biology Division, Saha Institute of Nuclear Physics, 1/AF Bidhannagar, Kolkata, 700064, India.

The Journal of Membrane Biology
|September 29, 2020
PubMed
Summary

Spectrin

Keywords:
ANSChaperoneHaemoglobinSpectrin

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Background:

  • Spectrin is a key protein in the human erythrocyte membrane skeleton.
  • Its diverse functions are not fully understood, particularly its chaperone activity.

Purpose of the Study:

  • To review and hypothesize the crosstalk between spectrin's chaperone activity and its other functions.
  • To explore the molecular basis and regulation of spectrin's chaperone capabilities.

Main Methods:

  • Literature review
  • Hypothesis formulation based on protein structure-function relationships
  • Analysis of spectrin-repeat domains, hydrophobic patches, and post-translational modifications

Main Results:

  • Spectrin's chaperone activity may stem from surface-exposed hydrophobic patches in its domains.
  • Chaperone activity competes with membrane phospholipid binding.
  • Glycation reduces chaperone function, while oligomerization enhances it.
  • Spectrin preferentially binds denatured hemoglobin and unstable hemoglobin variants.

Conclusions:

  • Spectrin's chaperone activity is modulated by its structural organization and modifications.
  • This activity may play a significant role in hemoglobin biochemistry, especially in disease states.