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Protein folding and misfolding: mechanism and principles

Published online by Cambridge University Press:  14 April 2008

S. Walter Englander ,
Leland Mayne  and
Mallela M. G. Krishna
S. Walter Englander*
Affiliation:
The Johnson Research Foundation, Department of Biochemistry and Biophysics, University of Pennsylvania, Philadelphia, USA
Leland Mayne
Affiliation:
The Johnson Research Foundation, Department of Biochemistry and Biophysics, University of Pennsylvania, Philadelphia, USA
Mallela M. G. Krishna
Affiliation:
The Johnson Research Foundation, Department of Biochemistry and Biophysics, University of Pennsylvania, Philadelphia, USA Department of Pharmaceutical Sciences and Biomolecular Structure Program, University of Colorado Health Sciences Center, Denver, CO, USA
*
*Author for correspondence: Dr S. W. Englander, Department of Biochemistry and Biophysics, University of Pennsylvania, Philadelphia, PA 19104-6059, USA. Tel.: 215-898-4509; Fax: 215-898-2415; Email: engl@mail.med.upenn.edu
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Abstract

Two fundamentally different views of how proteins fold are now being debated. Do proteins fold through multiple unpredictable routes directed only by the energetically downhill nature of the folding landscape or do they fold through specific intermediates in a defined pathway that systematically puts predetermined pieces of the target native protein into place? It has now become possible to determine the structure of protein folding intermediates, evaluate their equilibrium and kinetic parameters, and establish their pathway relationships. Results obtained for many proteins have serendipitously revealed a new dimension of protein structure. Cooperative structural units of the native protein, called foldons, unfold and refold repeatedly even under native conditions. Much evidence obtained by hydrogen exchange and other methods now indicates that cooperative foldon units and not individual amino acids account for the unit steps in protein folding pathways. The formation of foldons and their ordered pathway assembly systematically puts native-like foldon building blocks into place, guided by a sequential stabilization mechanism in which prior native-like structure templates the formation of incoming foldons with complementary structure. Thus the same propensities and interactions that specify the final native state, encoded in the amino-acid sequence of every protein, determine the pathway for getting there. Experimental observations that have been interpreted differently, in terms of multiple independent pathways, appear to be due to chance misfolding errors that cause different population fractions to block at different pathway points, populate different pathway intermediates, and fold at different rates. This paper summarizes the experimental basis for these three determining principles and their consequences. Cooperative native-like foldon units and the sequential stabilization process together generate predetermined stepwise pathways. Optional misfolding errors are responsible for 3-state and heterogeneous kinetic folding.

Type
Review Article
Information
Quarterly Reviews of Biophysics , Volume 40 , Issue 4 , November 2007 , pp. 1 - 41
Copyright
Copyright © Cambridge University Press 2008

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