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Nano-pulsed discharge plasma-induced abiotic oligopeptide formation from diketopiperazine

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Abstract

Conventional oligopeptide synthesis techniques involve environmentally harmful procedures and materials. In addition, the efficient accumulation of oligopeptides under Hadean Earth environments regarding the origin of life remains still unclear. In these processes, the formation of diketopiperazine is a big issue due to the strong inhibition for further elongation beyond dipeptides. Hydrothermal media enables environmentally friendly oligopeptide synthesis. However, hydrothermal oligopeptide synthesis produces large amounts of diketopiperazine (DKP), due to its thermodynamic stability. DKP inhibits dipeptide elongation and also constitutes an inhibitory pathway in conventional oligopeptide synthesis. Here, we show an efficient pathway for oligopeptide formation using a specially designed experimental setup to run both thermal and non-thermal discharge plasma, generated by nano-pulsed electric discharge with 16–23 kV voltage and 300–430 A current within ca. 500 ns. DKP (14%) was converted to dipeptides and higher oligopeptides in an aqueous solution containing alanine-DKP at pH 4.5, after 20 min of 50 pps thermal plasma irradiation. This is the first study to report efficient oligopeptide synthesis in aqueous medium using nano-pulsed plasma (with thermal plasma being more efficient than non-thermal plasma) via DKP ring-opening. This unexpected finding is implicative to evaluate the pathway how the oligopeptides could have accumulated in the primitive Earth with high-energy plasma sources such as thunder as well as to facilitate the green synthesis of oligopeptides.

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Funding

This research was continuously supported by the Collaborative Research Project of the Institute of Pulsed Power Science (IPPS) at Kumamoto University since 2010 and the Institute of Industrial Nanomaterials (IINa) at Kumamoto University since 2020. This research was financially supported by the MEXT Grant-in-Aid for Scientific Research (B), grant number JP19H02017.

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Mitsuru Sasaki and Kunio Kawamura contributed to the management, leadership, and coordination of the research activity planning and execution; they also contributed with the review and editing of the original draft, specifically with the critical review, commentary, and revision. Yuji Miyagawa, Kouki Nonaka, and Ryota Miyanomae contributed by conducting the research and investigation process, specifically performing the experiments and data collection. Furthermore, they contributed with the preparation and writing of the original draft. Armand T. Quitain contributed immensely with the product analysis by HPLC. Tetsuya Kida contributed with the oversight of the research activity planning, including mentorship external to the core team. Motonobu Goto contributed with the development of methodology in the initial stages of the study. Tetsuo Homma contributed with the product analysis by MALDI-TOF/MS and LC/MS. Tomohiro Furusato contributed with the development of the pulsed arc discharge equipment.

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Correspondence to Mitsuru Sasaki or Kunio Kawamura.

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The authors declare no competing interests.

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Communicated by: Addy Pross

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Sasaki, M., Miyagawa, Y., Nonaka, K. et al. Nano-pulsed discharge plasma-induced abiotic oligopeptide formation from diketopiperazine. Sci Nat 109, 33 (2022). https://doi.org/10.1007/s00114-022-01803-y

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  • DOI: https://doi.org/10.1007/s00114-022-01803-y

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