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Structure and collision-induced dissociation of the protonated cyclo His-Phe dipeptide: mechanistic studies and stereochemical effects

  • Regular Article - Molecular Physics and Chemical Physics
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Abstract

The role of stereochemical factors on the structure and the fragmentation paths of the protonated cyclic dipeptide cyclo histidine–phenylalanine is studied under ion traps conditions by combining tandem mass spectrometry, laser spectroscopy, quantum chemical calculations and chemical dynamics simulations. Vibrational spectroscopy obtained by Infrared Multiple Photon Dissociation (IRMPD) reveals a small difference between the two diastereomers, c-\(\hbox {LLH}^{+}\) and c-\(\hbox {LDH}^{+}\), arising mainly from ancillary CH...\(\uppi \) interactions. In contrast, there is a strong influence of the residues chirality on the collision-induced dissociation (CID) processes. Chemical dynamics simulations rationalize this effect and evidence that proton mobility takes place, allowing isomerization to intermediate cyclic structures that are different for c-\(\hbox {LLH}^{+}\) and c-\(\hbox {LDH}^{+}\), resulting in different barriers to proton mobility. This effect is related to the protonation of the imidazole ring. It contrasts with the minute stereochemical effects observed for other cyclic dipeptides in which the proton is borne by an amide CO.

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Data Availability Statement

This manuscript has data included as electronic supplementary material. [Authors’ comment: The online version of this article contains supplementary material, which is available to authorized users.]

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Acknowledgements

We thank Dr. J. M. Ortega and the CLIO team for technical assistance and Dr. D. Scuderi for helpful discussion. We thank F. Gobert for experimental help. We acknowledge the use of the computing facility cluster MésoLUM of the LUMAT federation (FR LUMAT 2764). AFPM and RS thank ANR DynBioReact (Grant No. ANR-14-CE06-0029-01) for financial support. The research described here has been supported by the Investissements d’Avenir LabEx PALM contract (ANR-10-LABX-0039-PALM).

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Ariel Pérez Mellor contributed to quantum chemistry calculations, chemical dynamics simulations, experimental investigation, data curation, and writing—original draft preparation. Ivan Alata was involved in experimental investigation. Katia Le Barbu-Debus contributed to quantum chemistry calculations and writing—reviewing and editing. Valeria Lepere was involved in experimental investigation, data curation, and writing—reviewing and editing. Riccardo Spezia contributed to methodology, chemical dynamics simulations, and writing—reviewing and editing. Anne Zehnacker was involved in conceptualization, quantum chemistry calculations, experimental investigation, and writing—original draft preparation, reviewing and editing.

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Correspondence to Anne Zehnacker.

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Pérez-Mellor, A., Le Barbu-Debus, K., Lepere, V. et al. Structure and collision-induced dissociation of the protonated cyclo His-Phe dipeptide: mechanistic studies and stereochemical effects. Eur. Phys. J. D 75, 165 (2021). https://doi.org/10.1140/epjd/s10053-021-00173-w

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