Probing the competition between secondary structures and local preferences in gas phase isolated peptide backbones

Physical Chemistry Chemical Physics : PCCP
Wutharath ChinMichel Mons

Abstract

Combining laser desorption with a supersonic expansion together with the selectivity of IR/UV double resonance spectroscopy makes it possible to isolate and characterise the gas phase of remarkable backbone conformations of short peptide chains mimicking protein segments. A systematic bottom-up approach involving a conformer-specific IR study of peptide sequences of increasing sizes has enabled us to map the spectral signatures of the intramolecular interactions, which shape the peptide backbone, in particular H-bonds. The precise data collected are directly comparable to the most sophisticated quantum chemistry calculations of these species and therefore constitute a stringent test for the theoretical methods used. One-residue chains reveal the local conformational preference of the backbone and its dependence upon the nature of the residue. The investigation of longer chains provides evidence for a competition between simple successions of local conformational preferences along the chain and more folded structures, in which a new H-bonding network, involving distant H-bonding sites along the backbone, takes place. From three residues, the issue of helical folding can also be addressed. The present review of the gas phase lite...Continue Reading

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