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My 65 years in protein chemistry

Published online by Cambridge University Press:  08 April 2015

Harold A. Scheraga
Harold A. Scheraga*
Affiliation:
Baker Laboratory of Chemistry, Cornell University, Ithaca, NY 14853-1301, USA
*
*Author for correspondence: Harold A. Scheraga, Baker Laboratory of Chemistry, Cornell University, Ithaca, NY 14853-1301, USA Email: [email protected]
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Abstract

This is a tour of a physical chemist through 65 years of protein chemistry from the time when emphasis was placed on the determination of the size and shape of the protein molecule as a colloidal particle, with an early breakthrough by James Sumner, followed by Linus Pauling and Fred Sanger, that a protein was a real molecule, albeit a macromolecule. It deals with the recognition of the nature and importance of hydrogen bonds and hydrophobic interactions in determining the structure, properties, and biological function of proteins until the present acquisition of an understanding of the structure, thermodynamics, and folding pathways from a linear array of amino acids to a biological entity. Along the way, with a combination of experiment and theoretical interpretation, a mechanism was elucidated for the thrombin-induced conversion of fibrinogen to a fibrin blood clot and for the oxidative-folding pathways of ribonuclease A. Before the atomic structure of a protein molecule was determined by x-ray diffraction or nuclear magnetic resonance spectroscopy, experimental studies of the fundamental interactions underlying protein structure led to several distance constraints which motivated the theoretical approach to determine protein structure, and culminated in the Empirical Conformational Energy Program for Peptides (ECEPP), an all-atom force field, with which the structures of fibrous collagen-like proteins and the 46-residue globular staphylococcal protein A were determined. To undertake the study of larger globular proteins, a physics-based coarse-grained UNited-RESidue (UNRES) force field was developed, and applied to the protein-folding problem in terms of structure, thermodynamics, dynamics, and folding pathways. Initially, single-chain and, ultimately, multiple-chain proteins were examined, and the methodology was extended to protein–protein interactions and to nucleic acids and to protein–nucleic acid interactions. The ultimate results led to an understanding of a variety of biological processes underlying natural and disease phenomena.

Keywords

Hydrogen bondshydrophobic interactionsstructurethermodynamicsfolding pathwaysexperimental and theoretical studies of protein foldingECEPPUNRES
Type
Review Article
Information
Quarterly Reviews of Biophysics , Volume 48 , Issue 2 , May 2015 , pp. 117 - 177
Copyright
Copyright © Cambridge University Press 2015 

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References

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