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Decomposition of methionine by low energy electrons

Abstract : 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).
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Submitted on : Thursday, May 31, 2012 - 2:06:45 PM
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J. Kopyra, I. Szamrej, H. Abdoul-Carime, B. Farizon, M. Farizon. Decomposition of methionine by low energy electrons. Physical Chemistry Chemical Physics, Royal Society of Chemistry, 2012, 14, pp.8000-8004. ⟨10.1039/C2CP40461C⟩. ⟨in2p3-00702830⟩



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