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Darii E, Gimbert Y, Alves S, Damont A, Perret A, Woods AS, Fenaille F, Tabet JC. First Direct Evidence of Interpartner Hydride/Deuteride Exchanges for Stored Sodiated Arginine/Fructose-6-phosphate Complex Anions within Salt-Solvated Structures. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2021; 32:1424-1440. [PMID: 33929837 DOI: 10.1021/jasms.1c00040] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Mass spectrometric investigations of noncovalent binding between low molecular weight compounds revealed the existence of gas-phase (GP) noncovalent complex (NCC) ions involving zwitterionic structures. ESI MS is used to prove the formation of stable sodiated NCC anions between fructose (F6P) and arginine (R) moieties. Theoretical calculations indicate a folded solvated salt (i.e., sodiated carboxylate interacting with phosphate) rather than a charge-solvated form. Under standard CID conditions, [(F6P+R-H+Na)-H]- competitively forms two major product ions (PIs) through partner splitting [(R-H+Na) loss] and charge-induced cross-ring cleavage while preserving the noncovalent interactions (noncovalent product ions (NCPIs)). MS/MS experiments combined with in-solution proton/deuteron exchanges (HDXs) demonstrated an unexpected labeling of PIs, i.e., a correlated D-enrichment/D-depletion. An increase in activation time up to 3000 ms favors such processes when limited to two H/D exchanges. These results are rationalized by interpartner hydride/deuteride exchanges (⟨HDX⟩) through stepwise isomerization/dissociation of sodiated NCC-d11 anions. In addition, the D-enrichment/D-depletion discrepancy is further explained by back HDX with residual water in LTQ (selective for the isotopologue NCPIs as shown by PI relaxation experiments). Each isotopologue leads to only one back HDX unlike multiple HDXs generally observed in GP. This behavior shows that NCPIs are zwitterions with charges solvated by a single water molecule, thus generating a back HDX through a relay mechanism, which quenches the charges and prevents further back HDX. By estimating back HDX impact on D-depletion, the interpartner ⟨HDX⟩ complementarity was thus illustrated. This is the first description of interpartner ⟨HDX⟩ and selective back HDX validating salt-solvated structures.
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Affiliation(s)
- Ekaterina Darii
- Génomique Métabolique, Genoscope, Institut François Jacob, CEA, CNRS, Univ Evry, Université Paris-Saclay, 91057 Evry, France
| | - Yves Gimbert
- Département de Chimie Moléculaire, UMR CNRS 5250, Université Grenoble Alpes, 38058 Grenoble, France
- Sorbonne Université, Faculté des Sciences et de l'Ingénierie, Institut Parisien de Chimie Moléculaire (IPCM), F-75005 Paris, France
| | - Sandra Alves
- Sorbonne Université, Faculté des Sciences et de l'Ingénierie, Institut Parisien de Chimie Moléculaire (IPCM), F-75005 Paris, France
| | - Annelaure Damont
- Université Paris-Saclay, CEA, INRAE, Département Médicaments et Technologies pour la Santé (DMTS), MetaboHUB, F-91191 Gif sur Yvette, France
| | - Alain Perret
- Génomique Métabolique, Genoscope, Institut François Jacob, CEA, CNRS, Univ Evry, Université Paris-Saclay, 91057 Evry, France
| | - Amina S Woods
- NIDA IRP, NIH Structural Biology Unit Cellular Neurobiology Branch, 333 Cassell Drive, Baltimore, Maryland 21224, United States
- The Johns Hopkins University School of Medicine, Pharmacology and Molecular Sciences, Baltimore, Maryland 21205, United States
| | - François Fenaille
- Université Paris-Saclay, CEA, INRAE, Département Médicaments et Technologies pour la Santé (DMTS), MetaboHUB, F-91191 Gif sur Yvette, France
| | - Jean-Claude Tabet
- Sorbonne Université, Faculté des Sciences et de l'Ingénierie, Institut Parisien de Chimie Moléculaire (IPCM), F-75005 Paris, France
- Université Paris-Saclay, CEA, INRAE, Département Médicaments et Technologies pour la Santé (DMTS), MetaboHUB, F-91191 Gif sur Yvette, France
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Daly S, Knight G, Halim MA, Kulesza A, Choi CM, Chirot F, MacAleese L, Antoine R, Dugourd P. Action-FRET of a Gaseous Protein. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2017; 28:38-49. [PMID: 27506208 PMCID: PMC5174150 DOI: 10.1007/s13361-016-1449-2] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2016] [Revised: 06/28/2016] [Accepted: 06/30/2016] [Indexed: 05/03/2023]
Abstract
Mass spectrometry is an extremely powerful technique for analysis of biological molecules, in particular proteins. One aspect that has been contentious is how much native solution-phase structure is preserved upon transposition to the gas phase by soft ionization methods such as electrospray ionization. To address this question-and thus further develop mass spectrometry as a tool for structural biology-structure-sensitive techniques must be developed to probe the gas-phase conformations of proteins. Here, we report Förster resonance energy transfer (FRET) measurements on a ubiquitin mutant using specific photofragmentation as a reporter of the FRET efficiency. The FRET data is interpreted in the context of circular dichroism, molecular dynamics simulation, and ion mobility data. Both the dependence of the FRET efficiency on the charge state-where a systematic decrease is observed-and on methanol concentration are considered. In the latter case, a decrease in FRET efficiency with methanol concentration is taken as evidence that the conformational ensemble of gaseous protein cations retains a memory of the solution phase conformational ensemble upon electrospray ionization. Graphical Abstract ᅟ.
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Affiliation(s)
- Steven Daly
- Institut Lumière Matière, Université Lyon 1-CNRS, Université de Lyon, 69622, Villeurbanne cedex, France
| | - Geoffrey Knight
- Institut Lumière Matière, Université Lyon 1-CNRS, Université de Lyon, 69622, Villeurbanne cedex, France
| | - Mohamed Abdul Halim
- Institut Lumière Matière, Université Lyon 1-CNRS, Université de Lyon, 69622, Villeurbanne cedex, France
| | - Alexander Kulesza
- Institut Lumière Matière, Université Lyon 1-CNRS, Université de Lyon, 69622, Villeurbanne cedex, France
| | - Chang Min Choi
- Institut Lumière Matière, Université Lyon 1-CNRS, Université de Lyon, 69622, Villeurbanne cedex, France
| | - Fabien Chirot
- Institut des Sciences Analytiques, Université Lyon 1 - CNRS, Université de Lyon, 69622, Villeurbanne Cedex, France
| | - Luke MacAleese
- Institut Lumière Matière, Université Lyon 1-CNRS, Université de Lyon, 69622, Villeurbanne cedex, France
| | - Rodolphe Antoine
- Institut Lumière Matière, Université Lyon 1-CNRS, Université de Lyon, 69622, Villeurbanne cedex, France
| | - Philippe Dugourd
- Institut Lumière Matière, Université Lyon 1-CNRS, Université de Lyon, 69622, Villeurbanne cedex, France.
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