Improved polymerase ribozyme efficiency on hydrophobic assemblies
Open accessAbstract
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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In-ice evolution of RNA polymerase ribozyme activity
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“The G93A and C97A mutations that provide the main cold-specific activity boost are located in the single-stranded linker region of the ribozyme between the catalytic core (1-90) and the processivity domain (105-187).”
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- Authors
- Müller, U. F., & Bartel, D. P.
- Affiliations
- Howard Hughes Medical Institute (US)
- Venue
- RNA
- Publisher
- Cold Spring Harbor Laboratory
- Published
- 2008-01-29
- Volume
- 14
- Issue
- 3
- Pages
- 552-562
- ISSN
- 1355-8382 (ISSN-L)
- 1469-9001
- PMC
- PMC2248263
- 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
- bronze
- doi.org
- 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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