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Related Experiment Videos

Stabilization of a binary protein complex by intein-mediated cyclization.

Cy M Jeffries1, Stephen C Graham, Philippa H Stokes

  • 1School of Molecular and Microbial Biosciences, University of Sydney, New South Wales 2006, Australia.

Protein Science : a Publication of the Protein Society
|September 27, 2006
PubMed
Summary
This summary is machine-generated.

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Intein-mediated cyclization creates stable cyclic protein complexes. Restricting more stable components enhances complex stability more than less stable ones, aiding protein interaction studies.

Area of Science:

  • Biochemistry
  • Structural Biology
  • Protein Engineering

Background:

  • Protein-protein interactions are crucial in biological processes.
  • Instability of protein complex components can hinder the study of these interactions.

Purpose of the Study:

  • To engineer a stable artificial intramolecular cyclic protein complex using intein-mediated cyclization.
  • To investigate the impact of cyclization and component stability on the overall complex stability.

Main Methods:

  • Intein-mediated cyclization to form a cyclic protein complex between LIM-only protein 4 (LMO4) and LIM domain binding protein 1 (ldb1).
  • X-ray crystallography to determine the structure of the cyclic complex.
  • Chemical and thermal denaturation assays (intrinsic tryptophan fluorescence, dynamic light scattering) to compare stability.

Related Experiment Videos

Main Results:

  • The X-ray structure of the cyclic complex was identical to non-cyclized versions.
  • The cyclic complex exhibited the highest stability against denaturation, while the intermolecular complex was the least stable.
  • Linear intramolecular variants showed differing stabilities, correlating with the contact order of key binding residues.

Conclusions:

  • Intein-mediated cyclization is an effective method for creating stable, artificial intramolecular cyclic protein complexes.
  • The stability enhancement of a protein complex through cyclization is influenced by which component's flexibility is restricted.
  • Restricting the more stable component of a complex may lead to greater overall stability compared to restricting less stable components.