Spin-Polarized Peroxyl Radical Adducts Formed from the Addition of Oxygen to Amino Acid Radicals
摘要:
Peroxyl radicals formed from the addition of oxygen to carbon radicals of N-acetyl glycine, serine, and diglycine are directly observed at room temperature via time-resolved EPR spectroscopy. Isotopic labeling confirms the identity of the N-acetyl glycine and diglycine peroxyl analogues. The peroxyl radicals show unusually strong chemically induced electron spin polarization which is discussed in terms of the radical pair mechanism and spin polarization transfer processes.
The methoxymethyl cation cleaves peptide bonds in the gas phase
作者:Michael A. Freitas、Richard A. J. O’Hair、Suresh Dua、John H. Bowie
DOI:10.1039/a703335d
日期:——
Methoxymethyl cations and simple N-acyl amino acids and
dipeptides react in the gas phase to form [M +
MeOCH
2
]
+
ions which fragment via a number
of pathways including amide bond cleavage.
Abstraction of deuterium from dideuteroglycine by aryl radical: A model for 1, 4-benzene diradical reactions with proteins
作者:Rebecca Braslau、Marc O. Anderson
DOI:10.1016/s0040-4039(98)00791-6
日期:1998.6
Arylradicals are generated by oxidation of aryl hydrazine with PbO2 or via photolysis of aryl iodide. Abstraction of deuterium from dideuteroglycine derivatives is demonstrated as a model for the possible reaction of 1, 4-aryl diradicals with amino acid residues in proteins.
Spin-Polarized Peroxyl Radical Adducts Formed from the Addition of Oxygen to Amino Acid Radicals
作者:Ryan C. White、Malcolm D. E. Forbes
DOI:10.1021/ol062510p
日期:2006.12.1
Peroxyl radicals formed from the addition of oxygen to carbon radicals of N-acetyl glycine, serine, and diglycine are directly observed at room temperature via time-resolved EPR spectroscopy. Isotopic labeling confirms the identity of the N-acetyl glycine and diglycine peroxyl analogues. The peroxyl radicals show unusually strong chemically induced electron spin polarization which is discussed in terms of the radical pair mechanism and spin polarization transfer processes.
Targeting Peptides with an Iron-Based Oxidant: Cleavage of the Amino Acid Backbone and Oxidation of Side Chains
作者:Anil R. Ekkati、Jeremy J. Kodanko
DOI:10.1021/ja075075i
日期:2007.10.1
The oxidation of protected amino acids using an iron-based oxidant is described. Substrates of the general formula Ac-X-NHtBu, where X = Gly (1), Ala (2), Val (3), Phe (4), Tyr (5), Trp (6), and Met (7) were constructed to model individual amino acid residues within a polypeptide chain. Oxidation of 1 by the iron catalyst [FeII(N4Py)(MeCN)](ClO4)2 (8) and KHSO5 leads to scission of the amino acid backbone