Bioengineered immune therapeutics targeting O-GlcNAcylated NF-kappaB c-Rel to treat autoimmune diabetes
EUROPEAN JOURNAL OF IMMUNOLOGY
Authors: Ramakrishnan, P.; Pokorski, J.; Centore, J.; de Jesus, T.; Church, D.
Abstract
Mass Spectra of New Heterocycles: XXI. Study of Alkyl [(5-Amino-1H-pyrrol-2-yl)sulfanyl]acetates by Electron and Chemical Ionization Mass Spectrometry
RUSSIAN JOURNAL OF ORGANIC CHEMISTRY
Authors: Klyba, L., V; Nedolya, N. A.; Sanzheeva, E. R.; Tarasova, O. A.
Abstract
The fragmentation of previously inaccessible alkyl [(5-amino-1H-pyrrol-2-yl)sulfanyl]acetates under electron (70 eV) and chemical (reactant gas methane) ionization conditions was studied for the first time. Under electron ionization, all the studied compounds form a molecular ion (I(rel)7-100%), the main primary fragmentation pathway of which is associated with the C-S bond cleavage in the sulfanyl group and elimination of the ester fragment ((ROCOCH2)-O-4) in the form of a radical. The chemical ionization of alkyl [(5-amino-1H-pyrrol-2-yl)sulfanyl]acetates is characterized by protonation, recharging, and electrophilic addition. The base peak belongs to an [M+ H](+)ion. Chemical ionization is accompanied by the elimination of an R(4)OCOCH(2)radical from theM(+center dot)and [M+ Et](+)ions and an (ROCOCHS)-O-4 molecule from theM(+center dot)and [M+ H](+)ions.