Cited by 46Origins and Evolution of LifeRNA and protein synthesis mechanismsEvolution and Genetic Dynamics

Improved polymerase ribozyme efficiency on hydrophobic assemblies

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Müller, Ulrich F., Bartel, David P.·2008·RNA

Abstract

During an early step in the evolution of life, RNA served both as genome and as catalyst, according to the RNA world hypothesis. For self-replication, the RNA organisms must have contained an RNA that catalyzes RNA polymerization. As a first step toward recapitulating an RNA world in the laboratory, a polymerase ribozyme was generated previously by in vitro evolution and design. However, the efficiency of this ribozyme is about 100-fold too low for self-replication because of a low affinity of the ribozyme to its primer/template substrate. To improve the substrate interactions by colocalizing ribozyme and substrate on micelles, we attached hydrophobic anchors to both RNAs. We show here that the hydrophobic anchors led to aggregates with the expected size of the corresponding micelles. The micelle formation increased the polymerization yield of full-length products by 3- to 20-fold, depending on substrates and reaction conditions. With the best-characterized substrate, the improvement in polymerization efficiency was primarily due to reduced sequence-specific stalling on partially extended substrates. We discuss how, during the origin of life, micellar ribozyme aggregates could have acted as precursors to membrane-encapsulated life forms.

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  • Y exceeded R18 by about fourfold at 17°C, by more than 15-fold at −7°C in ice, and by more than 30-fold in supercooled solution.

    “While Y outperformed R18 by fourfold at 17°C (as judged by gel densitometry of average extension per primer15,22), at −7°C the differential rose to more than 15-fold in ice, and more than 30-fold in a supercooled solution.”

    From In-ice evolution of RNA polymerase ribozyme activity (2013) · cites this paper as [22]

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Authors
Müller, U. F., & Bartel, D. P.
Affiliations
Howard Hughes Medical Institute (US)
Venue
RNA
Published
2008-01-29
Volume
14
Issue
3
Pages
552-562
ISSN
  • 1355-8382 (ISSN-L)
  • 1469-9001
OpenAlex
W2168126416
Cited by
46
References
50
Citations by year
2025: 7 · 2024: 3 · 2022: 1 · 2021: 3 · 2019: 2 · 2018: 2 · 2017: 4 · 2015: 4 · 2013: 2 · 2012: 1
FWCI
3.30
Type
journal article
Language
en
Open access
Locations
  • RNA (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • HighWire Press Open Archive (submittedVersion)
Funders
  • Deutsche Forschungsgemeinschaft
  • National Institutes of Health
  • National Institute of General Medical Sciences (GM071283, GM061835, R01GM061835, F32GM071283, R37GM061835)
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
RNA world, RNA self-replication, hydrophobic anchor, micelles, RNA aggregation, origin of life, in vitro evolution
MeSH terms
Origin of Life, Base Sequence, Cholesterol, Genetic Engineering, Kinetics, Micelles, Models, Biological, Molecular Sequence Data, Nucleic Acid Conformation, Substrate Specificity, RNA, Catalytic, DNA Primers, Hydrophobic and Hydrophilic Interactions

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