Title :

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

Author(s) :

Li, Juan [Auteur]
Wang, Junzhi [Auteur]
Lu, Xing [Auteur]
Ilyushin, Vadim [Auteur]
Motiyenko, Roman [Auteur]
Gou, Qian [Auteur]
Alekseev, Eugene [Auteur]
Quan, Donghui [Auteur]
Margules, Laurent [Auteur]
Physique Moléculaire aux Interfaces [PMI]
Laboratoire de Physique des Lasers, Atomes et Molécules - UMR 8523 [PhLAM]
Gao, Feng [Auteur]
Lovas, Frank [Auteur]
Wu, Yajun [Auteur]
Bergin, Edwin [Auteur]
Li, Shanghuo [Auteur]
Shen, Zhiqiang [Auteur]
Du, Fujun [Auteur]
Li, Meng [Auteur]
Zheng, Siqi [Auteur]
Zheng, Xingwu [Auteur]

Journal title :

The Astrophysical Journal

Publisher :

American Astronomical Society

Publication date :

2021-09-16

ISSN :

0004-637X

English keyword(s) :

Astrochemistry (75)
Spectral line identification (2073)
Spectroscopy (1558)

HAL domain(s) :

Physique [physics]

English abstract : [en]

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 ...
Show more >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 (C 2 H 5 CONH 2), the largest peptidelike 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 × 10 16 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.Show less >

Language :

Anglais

Peer reviewed article :

Oui

Audience :

Internationale

Popular science :

Non

Collections :

• Laboratoire de Physique des Lasers, Atomes et Molécules (PhLAM) - UMR 8523

Source :

Harvested from HAL