期刊
POLYMER INTERNATIONAL
卷 51, 期 7, 页码 661-665出版社
WILEY
DOI: 10.1002/pi.1027
关键词
molecular evolution; amino acid-N-carboxyanhydrides; peptides; nitrogen oxides; atmospheric photochemistry; early continental crust
Addressing the still open question of the prebiotic origin of sequential macromolecules (peptides, nucleic acids) on the primitive Earth, we describe a molecular engine (the primary pump), which works at ambient temperature and continuously generates, elongates and complexifies sequential peptides. This new scenario is based on a cyclic reaction sequence, whose keystep is the activation of amino acids into their N-carboxyanhydrides (NCA) through nitrosation by NOx. This process could have taken place on tidal beaches; it requires a buffered ocean, emerged land and a nitrosating atmosphere. With the help of geochemical studies and computer simulations of atmosphere photochemistry, we show that the primitive Earth during the Hadean may have satisfied all these requirements. (C) 2001 Society of Chemical Industry.
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