Spectroscopic Evidence for an Oxazolone Structure in Anionic b-Type Peptide Fragments
نویسندگان
چکیده
منابع مشابه
Spectroscopic Evidence for an Oxazolone Structure in Anionic b-Type Peptide Fragments
Infrared spectra of anionic b-type fragments generated by collision induced dissociation (CID) from deprotonated peptides are reported. Spectra of the b(2) fragments of deprotonated AlaAlaAla and AlaTyrAla have been recorded over the 800-1800 cm(-1) spectral range by multiple-photon dissociation (MPD) spectroscopy using an FTICR mass spectrometer in combination with the free electron laser FELI...
متن کاملSpectroscopic evidence for an oxazolone structure of the b(2) fragment ion from protonated tri-alanine.
Infrared multiple photon dissociation (IRMPD) spectroscopy is used to identify the structure of the b(2)(+) ion generated from protonated tri-alanine by collision induced dissociation (CID). The IRMPD spectrum of b(2)(+) differs markedly from that of protonated cyclo-alanine-alanine, demonstrating that the product is not a diketopiperazine. Instead, comparison of the IRMPD spectrum of b(2)(+) t...
متن کاملSpectroscopic and theoretical evidence for oxazolone ring formation in collision-induced dissociation of peptides.
Infrared spectroscopy of the b4+ fragment of Leu-enkephalin demonstrates that the oxazolone ring is formed during collision-induced dissociation of protonated peptides, whereas the linear acylium structure is not observed. Three distinct oxazolone structures are identified, based on the highly conformer-diagnostic C=O stretching mode of the oxazolone ring, clearly showing that proton transfer f...
متن کاملEvidence for functional heterogeneity of circulating B-type natriuretic peptide.
OBJECTIVES These studies describe molecular forms of circulating B-type natriuretic peptide (BNP) as well as their biological activity. BACKGROUND Increased circulating levels of immunoreactive BNP correlate with the severity of heart failure and are considered a sensitive biomarker. However, little is known about the molecular forms of circulating BNP and their biological activity. METHODS...
متن کاملdevelopment and implementation of an optimized control strategy for induction machine in an electric vehicle
in the area of automotive engineering there is a tendency to more electrification of power train. in this work control of an induction machine for the application of electric vehicle is investigated. through the changing operating point of the machine, adapting the rotor magnetization current seems to be useful to increase the machines efficiency. in the literature there are many approaches wh...
15 صفحه اولذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of The American Society for Mass Spectrometry
سال: 2011
ISSN: 1044-0305,1879-1123
DOI: 10.1007/s13361-011-0297-3