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Folding intermediates of wild-type and mutants of barnase. II. Correlation of changes in equilibrium amide exchange kinetics with the population of the folding intermediate

Dalby, PA; Clarke, J; Johnson, CM; Fersht, AR; (1998) Folding intermediates of wild-type and mutants of barnase. II. Correlation of changes in equilibrium amide exchange kinetics with the population of the folding intermediate. J MOL BIOL , 276 (3) 647 - 656.

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Abstract

There is an unanswered question from previous studies of H-1/H-2-exchange of amide protons of barnase. Under certain conditions, there is a relatively abrupt change from EX2 towards EX1 kinetics as the temperature is slightly increased. The change in kinetics for different mutants is not directly related to their changes in stability. We have measured the stability of the folding intermediate of barnase (I) in (H2O)-H-2 under a variety of conditions and calculated its population at different temperatures. The change in kinetics correlates with the change in the population of the folding intermediate. At higher temperatures and pH, the free energy of I becomes higher than that of the denatured state, D, and the kinetics becomes EX1. The data fit a simple kinetic scheme. Such changes in kinetics may be used to detect the presence of intermediates in the folding reaction at equilibrium in native conditions, but cannot distinguish whether they are on or off-pathway. (C) 1998 Academic Press Limited.

Type: Article
Title: Folding intermediates of wild-type and mutants of barnase. II. Correlation of changes in equilibrium amide exchange kinetics with the population of the folding intermediate
Keywords: hydrogen exchange, protein folding, stability, barnase, PANCREATIC TRYPSIN-INHIBITOR, PROTEIN ENGINEERING PROCEDURE, NUCLEAR-MAGNETIC-RESONANCE, HYDROGEN-EXCHANGE, PROTON-EXCHANGE, GLOBAL STABILITY, BEHAVIOR, RATES, UREA, PH
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Biochemical Engineering
URI: http://discovery.ucl.ac.uk/id/eprint/60142
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