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Engineering specificity in a dynamic protein complex with a single conserved mutation.

Qamar Bashir1, Elisabeth M Meulenbroek, Navraj S Pannu

  • 1Gorlaeus Laboratories, Leiden Institute of Chemistry, Leiden University, The Netherlands.

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|September 3, 2014
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Summary
This summary is machine-generated.

A single amino acid change in horse cytochrome c (Cc) significantly alters its binding dynamics and specificity with cytochrome c peroxidase (CcP). This highlights how crucial individual side chain interactions are for protein complex function in redox biology.

Keywords:
cytochrome ccytochrome c peroxidaseelectron transportnuclear magnetic resonanceprotein-ligand interactionsspecificitytransient complex

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Enzyme kinetics

Background:

  • Cytochrome c (Cc) and cytochrome c peroxidase (CcP) form complexes crucial for cellular respiration.
  • These complexes exist in a dynamic equilibrium between specific and non-specific states.
  • Understanding these interactions is key to deciphering electron transfer mechanisms.

Purpose of the Study:

  • To investigate the role of specific amino acid residues in the binding interface of horse Cc and CcP.
  • To determine how mutations affect the dynamics and specificity of the Cc-CcP complex.
  • To compare the structural and dynamic properties of wild-type and mutant complexes.

Main Methods:

  • Nuclear Magnetic Resonance (NMR) spectroscopy to assess complex dynamics.
  • X-ray crystallography to determine the structure of the Cc-CcP complex.
  • Site-directed mutagenesis to create specific amino acid substitutions (e.g., K13A).

Main Results:

  • Horse Cc forms a more dynamic complex with CcP compared to yeast Cc.
  • A conservative mutation (Lysine 13 to Arginine) in horse Cc reduces complex dynamics and enhances specificity.
  • The crystal structure of the stereospecific complex mirrors the yeast Cc-CcP interaction.
  • The K13A mutation paradoxically increases the dynamic nature of the complex.

Conclusions:

  • Specificity in redox protein complexes can be critically dependent on single side chain interactions.
  • Protein dynamics play a vital role in modulating the specificity of enzyme-substrate or protein-protein interactions.
  • Targeted mutations can be used to probe and engineer the functional properties of protein complexes.