Enhancement and Inhibitory Activities of Minerals for Alanine Oligopeptide Elongation Under Hydrothermal Conditions

Astrobiology
Kunio KawamuraYoshimi Maruoka

Abstract

In a previous study, we have showed that the elongation of an alanine oligopeptide [L-alanyl-L-alanyl-L-alanyl-L-alanine ((Ala)4)] to higher oligopeptides is enhanced by calcite and dolomite at 275°C, using a mineral-mediated hydrothermal flow reactor system. However, a problem during the use of hydrothermal flow reactor system was that some of the minerals, such as clay, could not be tested due to their clogging in the reactor. In this article, we attempted to analyze the scope of enhancement for the formation of L-alanyl-L-alanyl-L-alanyl-L-alanyl-L-alanine ((Ala)5) and higher oligopeptides with different minerals including clay minerals for the elongation of alanine oligopeptide at 175°C. First, carbonate minerals and some clay minerals showed an enhancement of the formation of (Ala)5 from (Ala)4. On the contrary, volcanic products showed strong inhibitory activities. According to the pH dependence on the (Ala)4 elongations, we confirmed that most enhancement and inhibitory activities are due to the pH influence on the elongation of (Ala)4. However, the enhancement of montmorillonite (Tsukinuno), sphalerite, apatite, tourmaline, calcite (Nitto Funka), and the inhibitory activities by volcanic ash (Shinmoedake), volcanic ash ...Continue Reading

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Citations

Jan 23, 2022·Origins of Life and Evolution of the Biosphere : the Journal of the International Society for the Study of the Origin of Life·João Paulo T BaúDimas A M Zaia

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