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Issue 22, 2012
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Decomposition of methionine by low energy electrons

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In this work, we present the results from low energy (<12 eV) electron impact on isolated methionine, Met. We show that dissociative electron attachment is the operative mechanism for the sulfur content amino-acid fragmentation. The two most dominant fragments are attributed to the (Met-H) and (C4NOH5) ions that are formed at energy below 2 eV. The formation of the latter anion is accompanied by the loss of neutral counterparts, which are most likely a water molecule and highly toxic methanethiol, CH3SH. Further fragments are associated with the damage at the sulfur end of the amino acid, producing the methyl sulfide anion CH3S or sulfur containing neutrals. In the context of radiation induced damage to biological material at the nano-scale level, the present interest of methionine arises from the implication of the molecule in biological processes (e.g., S-adenosyl methionine for the stimulation of DNA methyltransferase reactions or protein synthesis).

Graphical abstract: Decomposition of methionine by low energy electrons

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Publication details

The article was received on 14 Feb 2012, accepted on 16 Apr 2012 and first published on 16 Apr 2012

Article type: Paper
DOI: 10.1039/C2CP40461C
Citation: Phys. Chem. Chem. Phys., 2012,14, 8000-8004
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    Decomposition of methionine by low energy electrons

    J. Kopyra, I. Szamrej, H. Abdoul-Carime, B. Farizon and M. Farizon, Phys. Chem. Chem. Phys., 2012, 14, 8000
    DOI: 10.1039/C2CP40461C

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