scholarly journals IR action spectroscopy shows competitive oxazolone and diketopiperazine formation in peptides depends on peptide length and identity of terminal residue in the departing fragment

The Analyst ◽  
2014 ◽  
Vol 139 (9) ◽  
pp. 2137-2143 ◽  
Author(s):  
L. J. Morrison ◽  
J. Chamot-Rooke ◽  
V. H. Wysocki
Keyword(s):  
Gas Phase ◽  
Side Chain ◽  
Action Spectroscopy ◽  
Terminal Residue ◽  
The Third ◽  
Diketopiperazine Formation ◽  
Peptide Length

Diketopiperazine formation in gas-phase peptides depends on the side-chain of the third residue.

Gas-phase models of γ turns: Effect of side-chain/backbone interactions investigated by IR/UV spectroscopy and quantum chemistry

2005 ◽  
Vol 123 (8) ◽  
pp. 084301 ◽  
Author(s):  
Wutharath Chin ◽  
François Piuzzi ◽  
Jean-Pierre Dognon ◽  
Iliana Dimicoli ◽  
Michel Mons
Keyword(s):  
Quantum Chemistry ◽  
Gas Phase ◽  
Uv Spectroscopy ◽  
Side Chain ◽  
Phase Models

scholarly journals Electronic Spectroscopy of Isolated DNA Polyanions

2018 ◽  
Author(s):  
Steven Daly ◽  
Massimiliano Porrini ◽  
Frédéric Rosu ◽  
Valerie Gabelica
Keyword(s):  
Gas Phase ◽  
Absorption Spectra ◽  
Ion Mobility ◽  
Photoelectron Spectroscopy ◽  
Binding Energies ◽  
Action Spectroscopy ◽  
Action Spectra ◽  
Vis Spectroscopy ◽  
Electron Binding Energies ◽  
Electron Binding

In solution, UV-vis spectroscopy is often used to investigate structural changes in biomolecules (i.e., nucleic acids), owing to changes in the environment of their chromophores (i.e., the nucleobases). Here we address whether action spectroscopy could achieve the same for gas-phase ions, while taking the advantage of additional mass spectrometry and ion mobility separation of complex mixtures. We therefore systematically studied the action spectroscopy of homo-base 6-mer DNA strands (dG6, dA6, dC6, dT6), and discuss the results in light of gas-phase structures validated by ion mobility spectrometry and infrared ion spectroscopy, and in light of electron binding energies measured by photoelectron spectroscopy, and calculated electronic photo-absorption spectra. When UV photons interact with oligonucleotide polyanions, two main actions may take place: (1) fragmentation and (2) electron detachment. The action spectra reconstructed from fragmentation follow the absorption spectra well, and result from multiple cycles of absorption and internal conversion. The action spectra reconstructed from the electron photodetachment (EPD) efficiency reveal interesting phenomena: EPD depends on the charge state in a manner depending on electron binding energies, and is particularly efficient for purines but not pyrimidines. EPD thus reflects not only absorption, but also particular relaxation pathways of the electronic excited states. As these pathways lead to photo-oxidation, their investigation on model gas-phase systems may prove useful to elucidate mechanisms of photo-oxidative damages, which are linked to mutations and cancers.

scholarly journals Ultraviolet Action Spectroscopy of Iodine Labeled Peptides and Proteins in the Gas Phase

2012 ◽  
Vol 117 (6) ◽  
pp. 1228-1232 ◽  
Author(s):  
Benjamin B. Kirk ◽  
Adam J. Trevitt ◽  
Stephen J. Blanksby ◽  
Yuanqi Tao ◽  
Benjamin N. Moore ◽  
...  
Keyword(s):  
Gas Phase ◽  
Action Spectroscopy

Charge‐Tagged DNA Radicals in the Gas Phase Characterized by UV/Vis Photodissociation Action Spectroscopy

2020 ◽  
Vol 132 (20) ◽  
pp. 7846-7851
Author(s):  
Yue Liu ◽  
Andy Dang ◽  
Jan Urban ◽  
František Tureček
Keyword(s):  
Gas Phase ◽  
Action Spectroscopy ◽  
Dna Radicals

Synthetic applications of intramolecular insertion in arylcarbenes. VII. Aryl-substituted benzocycloalkenylidenes

1984 ◽  
Vol 37 (9) ◽  
pp. 1915 ◽  
Author(s):  
WD Crow ◽  
U Engkaninan-Low ◽  
YT Pang
Keyword(s):  
Gas Phase ◽  
Phenyl Ring ◽  
Side Chain ◽  
Electronic Effects ◽  
Carbene Insertion

A series of benzo-fused cyclic carbenes, bearing suitably located alkoxy substituents in the phenyl ring, has been generated in the gas phase and pyrolysed at 250�/0.002-0.40 mm. In all cases, carbene insertion into the adjacent C-H bond (Bamford-Stevens insertion) occurs, either exclusively or predominantly, with up to 35% 1,5 C-H insertion in the alkoxy side chain to form peri-fused tricyclic heterocycles. These results are rationalized in terms of geometrical and electronic effects.

On the turn-inducing properties of asparagine: the structuring role of the amide side chain, from isolated model peptides to crystallized proteins

2018 ◽  
Vol 20 (5) ◽  
pp. 3411-3423 ◽  
Author(s):  
S. Habka ◽  
W. Y. Sohn ◽  
V. Vaquero-Vara ◽  
M. Géléoc ◽  
B. Tardivel ◽  
...  
Keyword(s):  
Gas Phase ◽  
Laser Spectroscopy ◽  
Protein Structures ◽  
Side Chain ◽  
Amide Side Chain ◽  
Model Peptides

The anchoring properties of an asparagine (Asn) residue to its local backbone environment in turn model peptides is characterized using gas phase laser spectroscopy and compared to crystallized protein structures.

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