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Related Experiment Videos

Nucleotide hydrolysis-dependent conformational changes in p21(ras) as studied using ESR spectroscopy

M Haller1, U Hoffmann, T Schanding

  • 1Fachbereich Chemie/Biochemie, Universität Kaiserslautern, 67663 Kaiserslautern, Germany. vogel@chemie.uni-kl.de

The Journal of Biological Chemistry
|December 31, 1997
PubMed
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Researchers used ESR spectroscopy to study structural changes in p21(ras) during guanosine triphosphate (GTP) hydrolysis. They found that protein conformation changes occur simultaneously with GTP hydrolysis, providing insights into proto-oncogene regulation.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Structural Biology

Background:

  • The proto-oncogene product p21(ras) plays a critical role in cellular signaling pathways.
  • Understanding the structural dynamics of p21(ras) during nucleotide hydrolysis is crucial for deciphering its function.
  • GTP hydrolysis by p21(ras) is a key regulatory event linked to conformational changes.

Purpose of the Study:

  • To investigate structural changes in p21(ras) dependent on nucleotide hydrolysis using Electron Spin Resonance (ESR) spectroscopy.
  • To characterize the conformational states of p21(ras) bound to different guanine nucleotide analogs.
  • To determine the temporal relationship between GTP hydrolysis and protein conformational changes.

Main Methods:

  • Utilized ESR spectroscopy with spin-labeled guanine nucleotides (SL-GTP, SL-GDP, SL-guanylylimidodiphosphate).

Related Experiment Videos

  • Analyzed ESR spectra of p21(ras)-nucleotide complexes at different temperatures (0°C, 5°C, 25°C).
  • Calculated rate constants for conformational changes and compared them with hydrolysis rates.

    • Main Results:

    • ESR spectra of p21(ras)-SL-GTP and p21(ras)-SL-GDP complexes differed significantly, indicating distinct protein conformations.
    • SL-GTP served as an effective substrate analog, exhibiting hydrolysis rates comparable to GTP.
    • The rate constant for conformational change, determined by ESR, closely matched the hydrolysis rate of SL-GTP.

    Conclusions:

    • GTP hydrolysis by p21(ras) is accompanied by a simultaneous conformational change in the protein.
    • The findings support a model where structural rearrangements occur concurrently with the enzymatic hydrolysis step.
    • This study provides direct evidence linking nucleotide hydrolysis to dynamic structural alterations in p21(ras).