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Schätti J, Köhler V, Mayor M, Fein YY, Geyer P, Mairhofer L, Gerlich S, Arndt M. Matter-wave interference and deflection of tripeptides decorated with fluorinated alkyl chains. JOURNAL OF MASS SPECTROMETRY : JMS 2020; 55:e4514. [PMID: 32363659 PMCID: PMC7317408 DOI: 10.1002/jms.4514] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/29/2019] [Revised: 03/11/2020] [Accepted: 03/13/2020] [Indexed: 06/11/2023]
Abstract
Studies of neutral biomolecules in the gas phase allow for the study of molecular properties in the absence of solvent and charge effects, thus complementing spectroscopic and analytical methods in solution or in ion traps. Some properties, such as the static electronic susceptibility, are best accessed in experiments that act on the motion of the neutral molecules in an electric field. Here, we screen seven peptides for their thermal stability and electron impact ionizability. We identify two tripeptides as sufficiently volatile and thermostable to be evaporated and interfered in the long-baseline universal matter-wave interferometer. Monitoring the deflection of the interferometric molecular nanopattern in a tailored external electric field allows us to measure the static molecular susceptibility of Ala-Trp-Ala and Ala-Ala-Trp bearing fluorinated alkyl chains at C- and N-termini. The respective values are 4 π ε 0 × 330 ± 150 Å 3 and 4 π ε 0 × 270 ± 80 Å 3 .
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Affiliation(s)
- Jonas Schätti
- Department of ChemistryUniversity of BaselCH‐St. Johannsring 1Basel4056Switzerland
| | - Valentin Köhler
- Department of ChemistryUniversity of BaselCH‐St. Johannsring 1Basel4056Switzerland
| | - Marcel Mayor
- Department of ChemistryUniversity of BaselCH‐St. Johannsring 1Basel4056Switzerland
- Institute of NanotechnologyKarlsruhe Institute of TechnologyHermann‐von‐Helmholtz‐Platz 1, 76344Eggenstein‐LeopoldshafenGermany
- Lehn Institute of Functional Materials (LIFM)Sun Yat‐Sen University (SYSU)XinGangXi Rd. 135, 510275GuangzhouChina
| | - Yaakov Y. Fein
- Faculty of PhysicsUniversity of ViennaBoltzmanngasse 5, 1090ViennaAustria
| | - Philipp Geyer
- Faculty of PhysicsUniversity of ViennaBoltzmanngasse 5, 1090ViennaAustria
| | - Lukas Mairhofer
- Faculty of PhysicsUniversity of ViennaBoltzmanngasse 5, 1090ViennaAustria
| | - Stefan Gerlich
- Faculty of PhysicsUniversity of ViennaBoltzmanngasse 5, 1090ViennaAustria
| | - Markus Arndt
- Faculty of PhysicsUniversity of ViennaBoltzmanngasse 5, 1090ViennaAustria
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Schätti J, Kriegleder M, Debiossac M, Kerschbaum M, Geyer P, Mayor M, Arndt M, Köhler V. Neutralization of insulin by photocleavage under high vacuum. Chem Commun (Camb) 2019; 55:12507-12510. [DOI: 10.1039/c9cc05712a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Electrosprayed peptide ion beams are charge manipulated by photocleavage of chemical tags.
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Affiliation(s)
- Jonas Schätti
- Department of Chemistry
- University of Basel
- CH Basel
- Switzerland
| | | | | | | | - Philipp Geyer
- Faculty of Physics
- University of Vienna
- A-1090 Vienna
- Austria
| | - Marcel Mayor
- Department of Chemistry
- University of Basel
- CH Basel
- Switzerland
- Institute of Nanotechnology
| | - Markus Arndt
- Faculty of Physics
- University of Vienna
- A-1090 Vienna
- Austria
| | - Valentin Köhler
- Department of Chemistry
- University of Basel
- CH Basel
- Switzerland
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3
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Debiossac M, Schätti J, Kriegleder M, Geyer P, Shayeghi A, Mayor M, Arndt M, Köhler V. Tailored photocleavable peptides: fragmentation and neutralization pathways in high vacuum. Phys Chem Chem Phys 2018; 20:11412-11417. [PMID: 29645042 PMCID: PMC5932999 DOI: 10.1039/c8cp01058g] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2018] [Accepted: 03/23/2018] [Indexed: 01/31/2023]
Abstract
Photocleavable tags (PCTs) have the potential for excellent spatio-temporal control over the release of subunits of complex molecules. Here, we show that electrosprayed oligopeptides, functionalized by a tailored ortho-nitroarylether can undergo site-specific photo-activated cleavage under UV irradiation (266 nm) in high vacuum. The comparison of UV photodissociation (UVPD) and collision-induced dissociation (CID) points to the thermal nature of the cleavage mechanism, a picture corroborated by the temperature dependence of the process. Two competing photodissociation pathways can be identified. In one case a phenolate anion is separated from a neutral zwitterion. In the other case a neutral phenol derivative leaves a negatively charged peptide behind. To understand the factors favoring one channel over the other, we investigate the influence of the peptide length, the nature of the phenolic group and the position of the nitro-group (ortho vs. para). The observed gas phase cleavage of a para-nitro benzylic ether markedly differs from the established behavior in solution.
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Affiliation(s)
- M. Debiossac
- Faculty of Physics, University of Vienna , VCQ, Boltzmanngasse 5 , A-1090 Vienna , Austria .
| | - J. Schätti
- Department of Chemistry, University of Basel , Mattenstrasse 24a, BPR 1096 , CH-4058 Basel , Switzerland .
| | - M. Kriegleder
- Faculty of Physics, University of Vienna , VCQ, Boltzmanngasse 5 , A-1090 Vienna , Austria .
| | - P. Geyer
- Faculty of Physics, University of Vienna , VCQ, Boltzmanngasse 5 , A-1090 Vienna , Austria .
| | - A. Shayeghi
- Faculty of Physics, University of Vienna , VCQ, Boltzmanngasse 5 , A-1090 Vienna , Austria .
| | - M. Mayor
- Department of Chemistry, University of Basel , Mattenstrasse 24a, BPR 1096 , CH-4058 Basel , Switzerland .
- Institute of Nanotechnology (INT), Karlsruhe Institute of Technology (KIT) , Hermann-von-Helmholtz-Platz 1 , D-76344 Eggenstein-Leopoldshafen , Germany
- Lehn Institute of Functional Materials (LIFM), Sun Yat-Sen University (SYSU) , Xingang Rd. W. , Guangzhou , China
| | - M. Arndt
- Faculty of Physics, University of Vienna , VCQ, Boltzmanngasse 5 , A-1090 Vienna , Austria .
| | - V. Köhler
- Department of Chemistry, University of Basel , Mattenstrasse 24a, BPR 1096 , CH-4058 Basel , Switzerland .
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