Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5372357 | Biophysical Chemistry | 2007 | 12 Pages |
Abstract
Aspartic acid (Asp) and asparagine (Asn) are vulnerable amino acids. One-electron addition or withdrawal reactions initiate many deleterious processes involving these amino acids. To study these redox processes we have irradiated by γ-rays asparagine or aspartic acid in the solid state. The nature of the resulting free radicals was determined by electron paramagnetic resonance (EPR) and by calculations using DFT methods in various environments. Reactions initiated by electron transfer are different for both amino acids: Asn anion loses hydrogen atom whereas the cation undergoes decarboxylation. Conversely, Asp cation loses hydrogen atom from amine group, which triggers decarboxylation.
Related Topics
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Physical and Theoretical Chemistry
Authors
Grazyna Strzelczak, Jacqueline Bergès, Chantal Houée-Levin, Dariusz Pogocki, Krzysztof Bobrowski,