Japan Geoscience Union Meeting 2019

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[E] Poster

M (Multidisciplinary and Interdisciplinary) » M-IS Intersection

[M-IS07] Astrobiology

Thu. May 30, 2019 5:15 PM - 6:30 PM Poster Hall (International Exhibition Hall8, Makuhari Messe)

convener:Hikaru Yabuta(Hiroshima University, Department of Earth and Planetary Systems Science), Seiji Sugita(Department of Earth and Planetary Science, Graduate School of Science Sciece, The University of Tokyo), Misato Fukagawa(National Astronomical Observatory of Japan), Fujishima Kosuke(Tokyo Institute of Technology, Earth-Life Science Institute)

[MIS07-P05] A process model of L-homochiral peptides formation initiated with L-alanine

*Toratane Munegumi1, Taisuke Yamaga1 (1.Department of Science Education, Naruto University of Education)

Keywords:L-alanine, peptides, homochirality

Hydrogen abstraction from L-alanine by hydroxy radical facilitates alkylation on β-carbon of alanine as well as retention of L-chirality. The reaction rate constant of hydrogen abstraction (k=6.21x107 M-1s-1) on β-carbon was about 3.7 times faster than that (k=1.7x107 M-1s-1) on α-carbon. The fact supports that alkylation proceeds faster than racemization, and the chirality of product amino acids will be hold. Similar alkylation of oligopeptides will also proceed with a lower level epimerization than alkylation. This research discusses how the lower reaction rate of epimerization than alkylation lead homochiral peptides.