Cited by 28Origins and Evolution of LifeRNA and protein synthesis mechanismsEvolution and Genetic Dynamics

Prebiotic co-evolution of self-replication and translation or RNA world?

Lahav, Noam·1991·Journal of Theoretical Biology

Abstract

A prebiotic scenario is proposed, based on the recent "domain hypothesis" model (Lahav, 1989, J. molec. Evol. 29, 475-479), suggested for domain propagation of RNA-like molecules in a fluctuating environment. The same system is suggested now not only for the evolution of ribozymes, but also for the evolution of directed peptide synthesis, as follows: Short, self-structured strands (termed prebioectons), each possessing a templatable domain which is chargeable by an amino acid, are the predecessors of tRNA (proto-tRNA). Complementary domains are formed on these prebioectons during an environmental cycle such as wetting-drying, followed by their dissociation from their template domain and ligation, to form the predecessor of mRNA (proto-mRNA). The evolution of directed peptide synthesis is suggested to be based on the ability of the charged prebioectons to attach preferentially to their complementary domains on the proto-mRNA. Two stages of this process are envisioned, namely: (a) Template-directed, random peptide synthesis taking place when non-specifically-charged prebioectons are sequentially attached each to its complementary domain on the proto-mRNA, followed by peptide bond formation. (b) Template-and-sequence-directed peptide synthesis, which can be realized after the "invention" of a catalytic molecule capable of specifically charging a proto-tRNA by an amino acid; this is the crucial evolutionary stage, where a crude genetic code becomes functional. Gradually, catalytic peptides and ribozymes are selected for their functions and evolve, while being encoded in the primitive "memory" of the emerging system. Thus, rather than the RNA monopoly postulated by the RNA World hypothesis, an early co-evolution of primitive enzymes and ribozymes is suggested.(ABSTRACT TRUNCATED AT 250 WORDS)

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Crossref · 10.1016/s0022-5193(05)80368-6

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Authors
Lahav, N.
Affiliations
Hebrew University of Jerusalem (IL)
Corresponding author
Lahav, Noam
Venue
Journal of Theoretical Biology
Publisher
Elsevier BV
Published
1991-08
Volume
151
Issue
4
Pages
531-539
ISSN
0022-5193 (ISSN-L)
OpenAlex
W1977185318
Cited by
28
References
42
Citations by year
2024: 1 · 2023: 2 · 2020: 1 · 2019: 1 · 2018: 2 · 2015: 2
FWCI
2.86
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of Theoretical Biology (publishedVersion)
  • PubMed (publishedVersion)
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 › Genetics › Evolution and Genetic Dynamics
Keywords
prebiotic evolution, RNA world, ribozymes, origin of the genetic code, wetting-drying cycles, aminoacylation, origin of translation
MeSH terms
Animals, Enzymes, Biological Evolution, Molecular Biology, Peptides, Ribosomes, RNA, Protein Biosynthesis

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