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Related Concept Videos

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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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 Complex Assembly02:41

Protein Complex Assembly

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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.
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Assembly of Complex Microtubule Structures01:32

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Complex microtubule structures are present in resting cells and in dividing cells. In resting cells, they are responsible for maintaining the cellular architecture, tracks for intracellular transport, positioning of organelles, assembly of cilia and flagella. They mediate the bipolar spindle assembly for chromosomal segregation and positioning of the cell division plate in dividing cells. The formation of microtubule complex structures depends on the cell type, cell stage, and cell function.
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Signaling cascades usually lack linearity. Multiple pathways interact and regulate one another, allowing cells to integrate and respond to diverse environmental stimuli.
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The spindle assembly checkpoint is a molecular surveillance mechanism ensuring the fidelity of chromosome segregation during anaphase. The checkpoint monitors the completion of all the prerequisite steps before chromosome segregation to determine whether the segregation process should proceed or be delayed.
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Related Experiment Video

Updated: Jun 15, 2025

Optimization of Synthetic Proteins: Identification of Interpositional Dependencies Indicating Structurally and/or Functionally Linked Residues
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Altered assembly paths mitigate interference among paralogous complexes.

Chi-Wei Yeh1, Kuan-Lun Hsu1, Shu-Ting Lin1

  • 1Institute of Molecular Biology, Academia Sinica, Taipei, Taiwan.

Nature Communications
|August 21, 2024
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Summary
This summary is machine-generated.

Protein complex assembly uses stable subcomplexes as building blocks. Divergent assembly pathways in paralogous complexes evolve new functions and prevent harmful hybrid formations.

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Related Experiment Videos

Last Updated: Jun 15, 2025

Optimization of Synthetic Proteins: Identification of Interpositional Dependencies Indicating Structurally and/or Functionally Linked Residues
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Area of Science:

  • Molecular Biology
  • Evolutionary Biology
  • Biochemistry

Background:

  • Protein complexes are essential for cellular functions.
  • Gene duplication and divergence drive protein complex evolution.
  • Understanding paralogous complex assembly and subunit stability is crucial.

Purpose of the Study:

  • Investigate how evolutionary pathways constrain paralogous protein complex assembly.
  • Determine the role of cooperative stability in protein complex formation.
  • Develop methods to compare in cellulo assembly of paralogous complexes.

Main Methods:

  • Identified subcomplexes formed by cooperative stabilization.
  • Developed a protein stability-guided method for in cellulo assembly comparison.
  • Analyzed assembly processes of paralogous protein complexes.

Main Results:

  • Cooperative stabilization defines subcomplex building blocks for assembly.
  • Paralogous complexes maintain oligomeric state and structure despite rearranged assembly.
  • Divergent assembly processes promote new functions and prevent hybrid assemblies.

Conclusions:

  • Subcomplexes act as conserved units in protein complex evolution.
  • Divergent assembly pathways ensure functional specialization and prevent cross-complex interference.
  • Protein stability is a key factor guiding the evolution of complex assembly.