Non-enzymatic template-directed synthesis on RNA random copolymers
Abstract
Poly(C,A) random copolymer templates direct the oligomerization of 2-MeImpG (2-MeImpX is the 5'-phospho-2-methylimidazolide of the nucleoside X) and 2-MeImpU, resulting in the production of a variety of oligo (G,U)s. This reaction is less efficient than comparable reactions involving poly(C,U) or poly(C,G) templates. The efficiency of monomer incorporation into newly synthesized oligomers is lower for 2-MeImpU than 2-MeImpG, and cannot be improved by increasing the concentration of 2-MeImpU relative to 2-MeImpG. This suggests that RNA templates containing runs of consecutive adenine residues would not be suitable for use in a chemical self-replicating system. The distribution of oligomeric products can be characterized in detail using high-pressure liquid chromatography on an RPC-5 column. Oligomers are separated on the basis of chain length, base composition, and phosphodiester-linkage isomerism. Oligomers up to about the 13-mer, with base composition Gn, Gn-1, U, and Gn-2, U2, have been identified.
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These compositional limitations resemble those seen in nonenzymatic contexts, indicating analogous constraints from the stacking and hydrogen-bonding properties of the natural nucleobases.
“Such compositional limitations are reminiscent of those observed in nonenzymatic contexts32, highlighting the analogous constraints upon both processes arising from the distinct stacking and hydrogen bonding properties of the natural nucleobases.”
From In-ice evolution of RNA polymerase ribozyme activity (2013) · cites this paper as [32]
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- Authors
- Joyce, G. F., & Orgel, L. E.
- Affiliations
- Salk Institute for Biological Studies (US)
- ORCID
- Joyce, G.F.
- Venue
- Journal of Molecular Biology
- Publisher
- Elsevier BV
- Published
- 1988-08
- Volume
- 202
- Issue
- 3
- Pages
- 677-681
- ISSN
- 0022-2836 (ISSN-L)
- OpenAlex
- W4243045289
- Cited by
- 36
- References
- 10
- Citations by year
- 2025: 1 · 2024: 2 · 2023: 1 · 2021: 2 · 2019: 2 · 2016: 2 · 2015: 1 · 2013: 2 · 2012: 1
- FWCI
- 2.66
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Journal of Molecular Biology (publishedVersion)
- PubMed (publishedVersion)
- Funders
- National Institute of General Medical Sciences (GM13434)
- Topics
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Origins and Evolution of Life
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA and protein synthesis mechanisms
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › DNA and Nucleic Acid Chemistry
- MeSH terms
- Chromatography, High Pressure Liquid, Guanosine Monophosphate, Oligonucleotides, Poly A, Poly C, Polyribonucleotides, RNA, Templates, Genetic, Uridine Monophosphate
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