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Related Concept Videos

Inhibition of Cdk Activity02:34

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The orderly progression of the cell cycle depends on the activation of Cdk protein by binding to its cyclin partner. However, the cell cycle must be restricted when undergoing abnormal changes. Most cancers correlate to the deregulated cell cycle, and since Cdks are a central component of the cell cycle, Cdk inhibitors are extensively studied to develop anticancer agents. For instance, cyclin D associates with several Cdks, such as Cdk 4/6, to form an active complex. The cyclin D-Cdk4/6 complex...
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Indirect-acting cholinergic agonists work by interacting with an enzyme called acetylcholinesterase (AChE) in the synaptic cleft. They can be reversible or irreversible inhibitors and have different effects on the enzyme.
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Indirect-acting cholinergic agonists are agents that interact with the acetylcholinesterase enzyme in the synaptic cleft, preventing the breakdown of acetylcholine into choline and acetate. Consequently, the concentration of acetylcholine in the synaptic cleft increases. These agonists can be classified into reversible and irreversible inhibitors based on their duration of action.
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Updated: Jun 21, 2025

Development of Inhibitors of Protein-protein Interactions through REPLACE: Application to the Design and Development Non-ATP Competitive CDK Inhibitors
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CK-666 and CK-869 differentially inhibit Arp2/3 iso-complexes.

LuYan Cao1, Shaina Huang2, Angika Basant2

  • 1The Francis Crick Institute, London, UK. luyan.cao@crick.ac.uk.

EMBO Reports
|July 15, 2024
PubMed
Summary
This summary is machine-generated.

The Arp2/3 complex inhibitors CK-666 and CK-869 show differential activity against mammalian iso-complexes. Their effectiveness in inhibiting actin nucleation and branching depends on specific subunit composition, impacting cell functions like migration.

Keywords:
Arp2/3 Iso-ComplexesCK-666CK-869InhibitionSPIN90

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • The Arp2/3 complex is crucial for actin nucleation and cellular processes.
  • CK-666 and CK-869 are common chemical probes for Arp2/3 complex function.
  • Mammalian Arp2/3 complex exists as multiple iso-complexes due to gene duplication.

Purpose of the Study:

  • To investigate the differential activity of CK-666 and CK-869 against distinct Arp2/3 iso-complexes.
  • To determine how iso-complex composition affects inhibitor efficacy in actin nucleation and branching.
  • To clarify the implications of iso-complex heterogeneity for interpreting experimental results.

Main Methods:

  • Utilized recombinant Arp2/3 complexes with defined subunit compositions.
  • Assessed the activity of CK-666 and CK-869 on linear actin filament formation and branching.
  • Examined inhibitor effects on phagocytosis and cell migration in bone marrow-derived macrophages.

Main Results:

  • Both CK-666 and CK-869 inhibit linear actin formation across different ArpC1 iso-complexes.
  • Actin branching inhibition is iso-complex dependent: both drugs inhibit ArpC1A complexes, but only CK-869 inhibits ArpC1B complexes.
  • CK-869, but not CK-666, impaired macrophage phagocytosis and migration, correlating with low ArpC1A expression.

Conclusions:

  • The efficacy of CK-666 and CK-869 is significantly influenced by Arp2/3 iso-complex composition.
  • CK-869 exhibits broader inhibitory activity against ArpC1 and Arp3 iso-complexes compared to CK-666.
  • Findings necessitate careful consideration of Arp2/3 iso-complex expression when interpreting studies using these inhibitors.