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Related Experiment Videos

An evolutionary bridge to a new protein fold.

M H Cordes1, R E Burton, N P Walsh

  • 1Department of Biology, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.

Nature Structural Biology
|December 2, 2000
PubMed
Summary

The Arc repressor N11L mutant acts as an evolutionary bridge, dynamically switching between beta-sheet and helical structures. This protein flexibility is influenced by environmental factors and ligand binding.

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Area of Science:

  • Protein structure and dynamics
  • Molecular evolution
  • Biophysics

Background:

  • The Arc repressor protein exists in wild-type (beta-sheet) and 'switch Arc' (helical) conformations.
  • The N11L mutation creates an intermediate state, Arc-N11L, bridging these two structures.

Purpose of the Study:

  • To investigate the conformational flexibility of the Arc-N11L mutant.
  • To understand the role of the N11L mutation in protein evolution.
  • To elucidate the factors influencing the equilibrium between different Arc conformations.

Main Methods:

  • Characterization of the Arc-N11L mutant protein.
  • Analysis of structural transitions and dynamics.
  • Investigation of environmental and ligand-binding effects on protein conformation.

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Main Results:

  • Arc-N11L can adopt both wild-type and mutant conformations.
  • Structural exchange occurs on the millisecond timescale, indicating a dynamic equilibrium.
  • The equilibrium is sensitive to temperature, solvent conditions, and ligand binding.
  • Leucine (in N11L) integrates into the helical core or occupies a surface position, while Asparagine (in wild-type) is excluded from the helical core.

Conclusions:

  • The N11L mutation facilitates evolutionary adaptation by enabling a transition from beta-sheet to helical structures.
  • Arc-N11L serves as a crucial evolutionary intermediate, demonstrating plasticity in protein folding.
  • Environmental and binding conditions modulate protein structure, highlighting the dynamic nature of protein function.