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  Propionamide (C2H5CONH2): The Largest Peptide-like Molecule in Space

Li, J., Wang, J., Lu, X., Ilyushin, V., Motiyenko, R. A., Gou, Q., et al. (2021). Propionamide (C2H5CONH2): The Largest Peptide-like Molecule in Space. The Astrophysical Journal, 919(1): 4. doi:10.3847/1538-4357/ac091c.

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 Creators:
Li, Juan, Author
Wang, Junzhi, Author
Lu, Xing, Author
Ilyushin, Vadim, Author
Motiyenko, Roman A., Author
Gou, Qian, Author
Alekseev, Eugene A., Author
Quan, Donghui, Author
Margulès, Laurent, Author
Gao, Feng1, Author              
Lovas, Frank J., Author
Wu, Yajun, Author
Bergin, Edwin, Author
Li, Shanghuo, Author
Shen, Zhiqiang, Author
Du, Fujun, Author
Li, Meng, Author
Zheng, Siqi, Author
Zheng, Xingwu, Author
Affiliations:
1Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society, ou_159889              

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 Abstract: Peptide bonds, as the molecular bridges that connect amino acids, are crucial to the formation of proteins. Searches and studies of molecules with embedded peptide-like bonds are thus important for the understanding of protein formation in space. Here we report the first tentative detection of propionamide (C2H5CONH2), the largest peptide-like molecule detected in space toward Sagittarius B2(N1) at a position called N1E that is slightly offset from the continuum peak. New laboratory measurements of the propionamide spectrum were carried out in the 9–461 GHz range, which provide good opportunity to check directly for the transition frequencies of detected interstellar lines of propionamide. Our observing result indicates that propionamide emission comes from the warm, compact cores in Sagittarius B2, in which massive protostellars are forming. The column density of propionamide toward Sgr B2(N1E) was derived to be 1.5 × 1016 cm−2, which is three-fifths of that of acetamide, and one-nineteenth of that of formamide. This detection suggests that large peptide-like molecules can form and survive during star-forming process and may form more complex molecules in the interstellar medium (ISM). The detection of propionamide bodes well for the presence of polypeptides, as well as other complex prebiotic molecules in the ISM.

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 Dates: 2021-09-16
 Publication Status: Published online
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 Identifiers: DOI: 10.3847/1538-4357/ac091c
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Title: The Astrophysical Journal
Source Genre: Journal
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Publ. Info: Bristol; Vienna : IOP Publishing; IAEA
Pages: - Volume / Issue: 919 (1) Sequence Number: 4 Start / End Page: - Identifier: ISSN: 0004-637X
CoNE: https://pure.mpg.de/cone/journals/resource/954922828215_3