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Assembly of Signaling Complexes01:30

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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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Different fluorescence-based techniques are used to study the protein dynamics in living cells. These techniques include FRAP, FRET, and PET.
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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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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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Selective Modulation of Dynamic Protein Complexes.

Julie M Garlick1, Anna K Mapp2

  • 1Department of Chemistry, University of Michigan, Ann Arbor, MI 48109, USA.

Cell Chemical Biology
|August 14, 2020
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Discovering selective small-molecule modulators for dynamic proteins is challenging. Recent advances in screening techniques are improving the identification of allosteric mechanisms for these critical cellular targets.

Keywords:
drug discoverydynamic proteinsprobe discoveryprotein-protein interactions

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Area of Science:

  • Biochemistry and Molecular Biology
  • Chemical Biology
  • Drug Discovery

Background:

  • Dynamic proteins are essential for cellular functions like proteostasis, transcription, translation, and signaling.
  • These proteins are attractive targets for chemical probes and drug discovery but are difficult to target due to their non-classical nature.
  • Achieving selectivity is crucial for chemical probes targeting these dynamic protein hubs with extensive interaction networks.

Purpose of the Study:

  • To review and highlight screening approaches suitable for highly dynamic protein targets.
  • To discuss recent technological advances in identifying selective small-molecule modulators for dynamic proteins.
  • To emphasize the importance of allosteric mechanisms in modulating dynamic protein function.

Main Methods:

  • Focus on advanced screening methodologies tailored for dynamic protein targets.
  • Exploration of techniques that enhance the discovery of allosteric regulatory mechanisms.
  • Review of recent literature and technological developments in small-molecule screening.

Main Results:

  • Significant improvements in target selectivity for small-molecule modulators of dynamic proteins have been observed in the last 2-4 years.
  • Techniques increasing the discovery likelihood of allosteric regulatory mechanisms are particularly notable.
  • New screening approaches show potential for streamlining the identification of selective modulators.

Conclusions:

  • Traditional rules for probe discovery may not apply to dynamic proteins and their complexes.
  • Technological advancements are yielding remarkable results in discovering selective modulators for dynamic proteins.
  • The discussed screening approaches offer a promising path for targeting dynamic proteins effectively.