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Related Concept Videos

Conserved Binding Sites01:49

Conserved Binding Sites

Many proteins’ biological role depends on their interactions with their ligands, small molecules that bind to specific locations on the protein known as ligand-binding sites. Ligand-binding sites are often conserved among homologous proteins as these sites are critical for protein function.
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Ligand Binding Sites

Proteins are dynamic macromolecules that carry out a wide variety of essential processes; however, the activities of most proteins depend on their interactions with other molecules or ions, known as ligands.
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Related Experiment Video

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A Micro-agar Salt Bridge Electrode for Analyzing the Proton Turnover Rate of Recombinant Membrane Proteins
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Optimal salt bridge for Trp-cage stabilization.

D Victoria Williams1, Aimee Byrne, James Stewart

  • 1Department of Chemistry, University of Washington, Seattle, Washington 98195, United States.

Biochemistry
|January 13, 2011
PubMed
Summary
This summary is machine-generated.

Computational and experimental studies explored Trp-cage stabilization through mutations. The D9-R16 salt bridge was found to be optimal for fold cooperativity and stabilization, challenging previous interpretations of the D9E mutation

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Area of Science:

  • Protein engineering
  • Biophysics
  • Computational chemistry

Background:

  • Previous studies suggested D9E mutation stabilizes Trp-cage.
  • Experimental data showed similar melting temperatures for wild-type and D9E mutant Trp-cage.
  • The role of specific mutations in Trp-cage stability requires further investigation.

Purpose of the Study:

  • To examine the stability of a modified Trp-cage (DAYAQ WLKDG GPSSG RPPPS) with various mutations.
  • To re-evaluate the stabilizing effect of the D9E mutation in Trp-cage.
  • To investigate the role of the D9-R16 salt bridge and R16 side chain in Trp-cage stability.

Main Methods:

  • Nuclear magnetic resonance (NMR) spectroscopy
  • Circular dichroism (CD) spectroscopy
  • Analysis of acidification-induced changes in melting temperature (Tm)

Main Results:

  • The D9E mutation showed the smallest acidification-induced change in apparent Tm.
  • CD melts of TC10b and its D9E mutant were similar, indicating no significant stabilization.
  • Other mutations ([D9R,R16E], [R16O], [D9E,R16O], [R16K], [D9E,R16K]) were destabilizing.
  • The original D9-R16 salt bridge appears optimal for fold cooperativity and stabilization.
  • Evidence of salt bridge formation in the [D9R,R16E] mutant was observed.
  • Ionized aspartate at the C-terminus of a helix decreases intrinsic helicity, impacting Trp-cage stability.

Conclusions:

  • The D9E mutation does not significantly stabilize the Trp-cage as previously suggested.
  • The D9-R16 salt bridge is crucial for optimal Trp-cage fold stability and cooperativity.
  • R16 side chain plays other stabilizing roles in the Trp-cage structure.
  • Reinterpretation of CD data suggests increased helix stability, not salt bridge enhancement, for D9E mutants at higher temperatures.