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Stability versus exchange: a paradox in DNA replication.

Christoffer Åberg1, Karl E Duderstadt2, Antoine M van Oijen3

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Summary
This summary is machine-generated.

Biological machines can be both stable and dynamic. A new multisite competitive exchange mechanism explains how protein complexes can maintain stability while allowing rapid subunit exchange, reconciling seemingly contradictory observations in cellular processes.

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Area of Science:

  • Molecular Biology
  • Biophysics
  • Systems Biology

Background:

  • Multi-protein complexes are essential for cellular functions.
  • While often considered stable, rapid subunit exchange occurs in critical cellular assemblies like DNA replication and transcription machinery.
  • This rapid exchange appears contradictory to the high stability of these complexes.

Purpose of the Study:

  • To propose and model a mechanism reconciling the stability and rapid exchange of protein complex subunits.
  • To explain how components can be stably integrated yet rapidly exchanged in the presence of competitors.

Main Methods:

  • Development of a multisite competitive exchange mechanism model.
  • Mathematical modeling to derive analytical expressions for complex stability.
  • Analysis using typical binding kinetic parameters to assess physical realism.

Main Results:

  • The multisite competitive exchange mechanism explains stable integration in the absence of competitors.
  • The mechanism allows for rapid subunit exchange when competing proteins are present.
  • The model demonstrates operational feasibility under realistic biophysical conditions.

Conclusions:

  • High stability and rapid exchange within multi-protein complexes are reconcilable.
  • The proposed mechanism provides a quantitative and qualitative framework for understanding dynamic protein assemblies.
  • This reconciles previous observations of stability and lability in cellular machines.