Bridging the prebiotic and RNA worlds: prebiotic RNA synthesis on clay.
Identifieur interne : 000962 ( Ncbi/Merge ); précédent : 000961; suivant : 000963Bridging the prebiotic and RNA worlds: prebiotic RNA synthesis on clay.
Auteurs : G. Ertem ; K J Prabahar ; P C Joshi ; J P FerrisSource :
- Journal of biomolecular structure & dynamics [ 1538-0254 ] ; 2000.
Descripteurs français
- KwdFr :
- MESH :
English descriptors
- KwdEn :
- MESH :
- chemical : Bentonite, Nucleotides, Oligonucleotides, Prebiotics, RNA.
- Catalysis, Origin of Life.
Abstract
Abstract Progress towards the laboratory demonstration of the steps in the prebiotic origin of the RNA world is reviewed. Montmorillonite clay catalyzes the formation of RNAs containing 6-14 monomer units from the activated mononucleotides of A, C, G, I and U. The RNAs formed have 3', 5'- and 2', 5'-links, pyrophosphate links and have both linear and cyclic chains. The purine oligonucleotides have more 3', 5'- links while the pyrimidine nucleotides have more 2', 5'-linkages. Template-directed synthesis on the heterogeneous oligo(C)s formed on mont- morillonite yields the corresponding oligo(G)s. The dimer fraction formed in the reaction of a binary mixture of a purine and pyrimidine nucleotide shows sequence selectivity with about a 20 fold excess of the 5'-purine-pyrimidine dimer over that of the 5'-pyrimidine-purine dimer. RNAs as long as 50 mers are formed by the elongation of a decamer bound to montmorillonite by the daily addition of activated monomer to it over a 14-day time period.
DOI: 10.1080/07391102.2000.10506623
PubMed: 22607426
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pubmed:22607426Le document en format XML
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<front><div type="abstract" xml:lang="en">Abstract Progress towards the laboratory demonstration of the steps in the prebiotic origin of the RNA world is reviewed. Montmorillonite clay catalyzes the formation of RNAs containing 6-14 monomer units from the activated mononucleotides of A, C, G, I and U. The RNAs formed have 3', 5'- and 2', 5'-links, pyrophosphate links and have both linear and cyclic chains. The purine oligonucleotides have more 3', 5'- links while the pyrimidine nucleotides have more 2', 5'-linkages. Template-directed synthesis on the heterogeneous oligo(C)s formed on mont- morillonite yields the corresponding oligo(G)s. The dimer fraction formed in the reaction of a binary mixture of a purine and pyrimidine nucleotide shows sequence selectivity with about a 20 fold excess of the 5'-purine-pyrimidine dimer over that of the 5'-pyrimidine-purine dimer. RNAs as long as 50 mers are formed by the elongation of a decamer bound to montmorillonite by the daily addition of activated monomer to it over a 14-day time period.</div>
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<Abstract><AbstractText>Abstract Progress towards the laboratory demonstration of the steps in the prebiotic origin of the RNA world is reviewed. Montmorillonite clay catalyzes the formation of RNAs containing 6-14 monomer units from the activated mononucleotides of A, C, G, I and U. The RNAs formed have 3', 5'- and 2', 5'-links, pyrophosphate links and have both linear and cyclic chains. The purine oligonucleotides have more 3', 5'- links while the pyrimidine nucleotides have more 2', 5'-linkages. Template-directed synthesis on the heterogeneous oligo(C)s formed on mont- morillonite yields the corresponding oligo(G)s. The dimer fraction formed in the reaction of a binary mixture of a purine and pyrimidine nucleotide shows sequence selectivity with about a 20 fold excess of the 5'-purine-pyrimidine dimer over that of the 5'-pyrimidine-purine dimer. RNAs as long as 50 mers are formed by the elongation of a decamer bound to montmorillonite by the daily addition of activated monomer to it over a 14-day time period.</AbstractText>
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