Biology
Scientific paper
Aug 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001esasp.496..367m&link_type=abstract
In: Exo-/astro-biology. Proceedings of the First European Workshop, 21 - 23 May 2001, ESRIN, Frascati, Italy. Eds.: P. Ehrenfreu
Biology
1
Organic Molecules, Origin Of Life
Scientific paper
Among all known bio-organic molecules within the living cells, RNA molecules are the only ones storing genetic information and performing catalysis. The RNA world hypthesis assumes that livings on earth are derived from an RNA molecular ancestor where RNA both stored the genetic information and catalyzed the first metabolic reactions. Among diverse RNA worlds proposed, it is thought that the invention of translation and encoded peptide synthesis took place with a "breakthrough organism", then giving rise to a ribonucleoprotein (RNP) world. Finally, modern biochemistry arose with the invention of DNA and the birth of modern molecular biology where the information flows from DNA to RNA which directs protein synthesis. Considering modern metabolism, it is possible to assign biochemical traits to the last common ancestor by simple parsimony rules, and assumptions about earlier metabolisms are possible using chemical criteria. According to this point of view, modern metabolism is considered as a palimpsest that has to be read and deciphered in ordered to understand its origin and evolution.
Décout Jean-Luc
Josse T.
Maurel Marie-Christine
Meli Marc
Vergne Jacques
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