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Related Experiment Videos

A kinetic folding intermediate probed by native state hydrogen exchange.

M J Parker1, S Marqusee

  • 1Department of Molecular and Cell Biology, University of California, Berkeley, 229 Stanley Hall, Berkeley, CA 94720, USA. martin.parker@bristol.ac.uk

Journal of Molecular Biology
|January 12, 2001
PubMed
Summary

Native state hydrogen exchange (HX) studies confirm that kinetic folding intermediates in rat CD2.d1 protein can be structurally and energetically characterized. This technique provides insights into protein folding pathways.

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Area of Science:

  • Protein folding dynamics
  • Biophysical chemistry
  • Structural biology

Background:

  • The N-terminal domain of rat CD2 (CD2.d1) folding involves a burst phase with a transient intermediate (I) preceding the native state (N).
  • Previous hydrogen exchange (HX) studies suggested that certain amides exchange from the native state under EX1 conditions, indicating involvement of the kinetic transition state barrier.

Purpose of the Study:

  • To investigate the structural and energetic properties of kinetic folding intermediates in CD2.d1 using native state HX (NHX) under varying denaturant concentrations.
  • To confirm the utility of NHX for characterizing transient folding intermediates.

Main Methods:

  • Stopped-flow fluorescence spectroscopy to study protein folding kinetics.
  • pH-dependent equilibrium hydrogen exchange (HX) studies under EX1 and EX2 conditions.

Related Experiment Videos

  • Native state HX (NHX) measurements across a range of denaturant concentrations.

    • Main Results:

    • NHX data fit a two-component (sub-global/global) mechanism, yielding thermodynamic parameters (ΔG, m-value).
    • Regression analysis showed correspondence between calculated (m, ΔG) values for amides and the kinetic burst phase transition.
    • This confirms that NHX can probe the structural and energetic characteristics of kinetic folding intermediates.

    Conclusions:

    • Native state hydrogen exchange is a powerful technique for characterizing the structural and energetic landscape of transient protein folding intermediates.
    • The study validates the NHX method for exploring the kinetic burst phase of protein folding.