1
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Han X, Müller UF. Assembly of catalytic complexes from randomized oligonucleotides. SCIENCE ADVANCES 2025; 11:eadu2647. [PMID: 40305600 PMCID: PMC12042897 DOI: 10.1126/sciadv.adu2647] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/30/2024] [Accepted: 03/25/2025] [Indexed: 05/02/2025]
Abstract
The early evolution of life relied on catalytic RNAs (ribozymes) for central functions. To test whether early catalysts could have assembled from multiple short nucleic acid fragments in random sequence environments, we performed an in vitro selection from a short RNA library in the presence of 256 different DNA 20-nucleotide oligomers. High-throughput sequencing and biochemical analysis showed that most of the selected 1331 RNA sequences required at least one DNA for activity. Representatives for four of six RNA clusters that depended on DNA cofactors were active even when the 256 DNAs were replaced by completely random DNA 20-nucleotide oligomers. The formation of these catalytic complexes and the recruitment of oligonucleotide cofactors from completely random libraries demonstrate an important principle for the emergence of the earliest oligonucleotide catalysts.
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Affiliation(s)
- Xu Han
- Department of Chemistry and Biochemistry, University of California San Diego, La Jolla, CA 92093, USA
| | - Ulrich F. Müller
- Department of Chemistry and Biochemistry, University of California San Diego, La Jolla, CA 92093, USA
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2
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Mulkidjanian AY, Dibrova DV, Bychkov AY. Origin of the RNA World in Cold Hadean Geothermal Fields Enriched in Zinc and Potassium: Abiogenesis as a Positive Fallout from the Moon-Forming Impact? Life (Basel) 2025; 15:399. [PMID: 40141744 PMCID: PMC11943819 DOI: 10.3390/life15030399] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2024] [Revised: 02/06/2025] [Accepted: 02/14/2025] [Indexed: 03/28/2025] Open
Abstract
The ubiquitous, evolutionarily oldest RNAs and proteins exclusively use rather rare zinc as transition metal cofactor and potassium as alkali metal cofactor, which implies their abundance in the habitats of the first organisms. Intriguingly, lunar rocks contain a hundred times less zinc and ten times less potassium than the Earth's crust; the Moon is also depleted in other moderately volatile elements (MVEs). Current theories of impact formation of the Moon attribute this depletion to the MVEs still being in a gaseous state when the hot post-impact disk contracted and separated from the nascent Moon. The MVEs then fell out onto juvenile Earth's protocrust; zinc, as the most volatile metal, precipitated last, just after potassium. According to our calculations, the top layer of the protocrust must have contained up to 1019 kg of metallic zinc, a powerful reductant. The venting of hot geothermal fluids through this MVE-fallout layer, rich in metallic zinc and radioactive potassium, both capable of reducing carbon dioxide and dinitrogen, must have yielded a plethora of organic molecules released with the geothermal vapor. In the pools of vapor condensate, the RNA-like molecules may have emerged through a pre-Darwinian selection for low-volatile, associative, mineral-affine, radiation-resistant, nitrogen-rich, and polymerizable molecules.
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Affiliation(s)
- Armen Y. Mulkidjanian
- Department of Physics, Osnabrueck University, D-49069 Osnabrueck, Germany
- Center of Cellular Nanoanalytics, Osnabrueck University, D-49069 Osnabrueck, Germany
- School of Bioengineering and Bioinformatics, Lomonosov Moscow State University, 119992 Moscow, Russia
- Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, 119992 Moscow, Russia
| | - Daria V. Dibrova
- School of Bioengineering and Bioinformatics, Lomonosov Moscow State University, 119992 Moscow, Russia
- Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, 119992 Moscow, Russia
| | - Andrey Y. Bychkov
- School of Geology, Lomonosov Moscow State University, 119992 Moscow, Russia;
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3
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Duzdevich D, Carr CE, Colville BWF, Aitken HRM, Szostak JW. Overcoming nucleotide bias in the nonenzymatic copying of RNA templates. Nucleic Acids Res 2024; 52:13515-13529. [PMID: 39530216 DOI: 10.1093/nar/gkae982] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2024] [Revised: 10/08/2024] [Accepted: 10/14/2024] [Indexed: 11/16/2024] Open
Abstract
The RNA World hypothesis posits that RNA was the molecule of both heredity and function during the emergence of life. This hypothesis implies that RNA templates can be copied, and ultimately replicated, without the catalytic aid of evolved enzymes. A major problem with nonenzymatic template-directed polymerization has been the very poor copying of sequences containing rA and rU. Here, we overcome that problem by using a prebiotically plausible mixture of RNA mononucleotides and random-sequence oligonucleotides, all activated by methyl isocyanide chemistry, that direct the uniform copying of arbitrary-sequence templates, including those harboring rA and rU. We further show that the use of this mixture in copying reactions suppresses copying errors while also generating a more uniform distribution of mismatches than observed for simpler systems. We find that oligonucleotide competition for template binding sites, oligonucleotide ligation and the template binding properties of reactant intermediates work together to reduce product sequence bias and errors. Finally, we show that iterative cycling of templated polymerization and activation chemistry improves the yields of random-sequence products. These results for random-sequence template copying are a significant advance in the pursuit of nonenzymatic RNA replication.
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Affiliation(s)
- Daniel Duzdevich
- Department of Chemistry, 5735 South Ellis Avenue, The University of Chicago, Chicago, IL 60637, USA
- Freiburg Institute for Advanced Studies, Albertstraße 19, Albert-Ludwigs-Universität Freiburg, 79104 Freiburg im Breisgau, Germany
| | - Christopher E Carr
- Daniel Guggenheim School of Aerospace Engineering, School of Earth and Atmospheric Sciences, 275 Ferst Drive NW, Georgia Institute of Technology, Atlanta, GA 30332, USA
| | - Ben W F Colville
- Department of Chemistry, 5735 South Ellis Avenue, The University of Chicago, Chicago, IL 60637, USA
| | - Harry R M Aitken
- Department of Molecular Biology, Center for Computational and Integrative Biology, 185 Cambridge Street, Massachusetts General Hospital, Boston, MA 02114, USA
- Howard Hughes Medical Institute, 185 Cambridge Street, Massachusetts General Hospital, Boston, MA 02114, USA
| | - Jack W Szostak
- Department of Chemistry, 5735 South Ellis Avenue, The University of Chicago, Chicago, IL 60637, USA
- Howard Hughes Medical Institute, 5735 South Ellis Avenue, The University of Chicago, Chicago, IL 60637, USA
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4
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Whitaker D, Powner MW. On the aqueous origins of the condensation polymers of life. Nat Rev Chem 2024; 8:817-832. [PMID: 39333736 DOI: 10.1038/s41570-024-00648-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/09/2024] [Indexed: 09/30/2024]
Abstract
Water is essential for life as we know it, but it has paradoxically been considered inimical to the emergence of life. Proteins and nucleic acids have sustained evolution and life for billions of years, but both are condensation polymers, suggesting that their formation requires the elimination of water. This presents intrinsic challenges at the origins of life, including how condensation polymer synthesis can overcome the thermodynamic pressure of hydrolysis in water and how nucleophiles can kinetically outcompete water to yield condensation products. The answers to these questions lie in balancing thermodynamic activation and kinetic stability. For peptides, an effective strategy is to directly harness the energy trapped in prebiotic molecules, such as nitriles, and avoid the formation of fully hydrolysed monomers. In this Review, we discuss how chemical energy can be built into precursors, retained, and released selectively for polymer synthesis. Looking to the future, the outstanding goals include how nucleic acids can be synthesized, avoiding the formation of fully hydrolysed monomers and what caused information to flow from nucleic acids to proteins.
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Affiliation(s)
- Daniel Whitaker
- Department of Chemistry, University College London, London, UK.
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Matreux T, Aikkila P, Scheu B, Braun D, Mast CB. Heat flows enrich prebiotic building blocks and enhance their reactivity. Nature 2024; 628:110-116. [PMID: 38570715 PMCID: PMC10990939 DOI: 10.1038/s41586-024-07193-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2022] [Accepted: 02/09/2024] [Indexed: 04/05/2024]
Abstract
The emergence of biopolymer building blocks is a crucial step during the origins of life1-6. However, all known formation pathways rely on rare pure feedstocks and demand successive purification and mixing steps to suppress unwanted side reactions and enable high product yields. Here we show that heat flows through thin, crack-like geo-compartments could have provided a widely available yet selective mechanism that separates more than 50 prebiotically relevant building blocks from complex mixtures of amino acids, nucleobases, nucleotides, polyphosphates and 2-aminoazoles. Using measured thermophoretic properties7,8, we numerically model and experimentally prove the advantageous effect of geological networks of interconnected cracks9,10 that purify the previously mixed compounds, boosting their concentration ratios by up to three orders of magnitude. The importance for prebiotic chemistry is shown by the dimerization of glycine11,12, in which the selective purification of trimetaphosphate (TMP)13,14 increased reaction yields by five orders of magnitude. The observed effect is robust under various crack sizes, pH values, solvents and temperatures. Our results demonstrate how geologically driven non-equilibria could have explored highly parallelized reaction conditions to foster prebiotic chemistry.
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Affiliation(s)
- Thomas Matreux
- Systems Biophysics, Ludwig-Maximilians-Universität München, Munich, Germany
| | - Paula Aikkila
- Systems Biophysics, Ludwig-Maximilians-Universität München, Munich, Germany
| | - Bettina Scheu
- Department of Earth and Environmental Sciences, Ludwig-Maximilians-Universität München, Munich, Germany
| | - Dieter Braun
- Systems Biophysics, Ludwig-Maximilians-Universität München, Munich, Germany
| | - Christof B Mast
- Systems Biophysics, Ludwig-Maximilians-Universität München, Munich, Germany.
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6
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Calaça Serrão A, Dänekamp FT, Meggyesi Z, Braun D. Replication elongates short DNA, reduces sequence bias and develops trimer structure. Nucleic Acids Res 2024; 52:1290-1297. [PMID: 38096089 PMCID: PMC10853772 DOI: 10.1093/nar/gkad1190] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2023] [Revised: 11/15/2023] [Accepted: 11/30/2023] [Indexed: 02/10/2024] Open
Abstract
The origin of molecular evolution required the replication of short oligonucleotides to form longer polymers. Prebiotically plausible oligonucleotide pools tend to contain more of some nucleobases than others. It has been unclear whether this initial bias persists and how it affects replication. To investigate this, we examined the evolution of 12-mer biased short DNA pools using an enzymatic model system. This allowed us to study the long timescales involved in evolution, since it is not yet possible with currently investigated prebiotic replication chemistries. Our analysis using next-generation sequencing from different time points revealed that the initial nucleotide bias of the pool disappeared in the elongated pool after isothermal replication. In contrast, the nucleotide composition at each position in the elongated sequences remained biased and varied with both position and initial bias. Furthermore, we observed the emergence of highly periodic dimer and trimer motifs in the rapidly elongated sequences. This shift in nucleotide composition and the emergence of structure through templated replication could help explain how biased prebiotic pools could undergo molecular evolution and lead to complex functional nucleic acids.
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Affiliation(s)
- Adriana Calaça Serrão
- Systems Biophysics, Physics Department, Center for NanoScience, Ludwig-Maximilians-Universität München, Amalienstraße 54, 80799 Munich, Germany
| | - Felix T Dänekamp
- Systems Biophysics, Physics Department, Center for NanoScience, Ludwig-Maximilians-Universität München, Amalienstraße 54, 80799 Munich, Germany
| | - Zsófia Meggyesi
- Systems Biophysics, Physics Department, Center for NanoScience, Ludwig-Maximilians-Universität München, Amalienstraße 54, 80799 Munich, Germany
| | - Dieter Braun
- Systems Biophysics, Physics Department, Center for NanoScience, Ludwig-Maximilians-Universität München, Amalienstraße 54, 80799 Munich, Germany
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Weingart M, Chen S, Donat C, Helmbrecht V, Orsi WD, Braun D, Alim K. Alkaline vents recreated in two dimensions to study pH gradients, precipitation morphology, and molecule accumulation. SCIENCE ADVANCES 2023; 9:eadi1884. [PMID: 37774032 PMCID: PMC10541008 DOI: 10.1126/sciadv.adi1884] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/24/2023] [Accepted: 08/30/2023] [Indexed: 10/01/2023]
Abstract
Alkaline vents (AVs) are hypothesized to have been a setting for the emergence of life, by creating strong gradients across inorganic membranes within chimney structures. In the past, three-dimensional chimney structures were formed under laboratory conditions; however, no in situ visualization or testing of the gradients was possible. We develop a quasi-two-dimensional microfluidic model of AVs that allows spatiotemporal visualization of mineral precipitation in low-volume experiments. Upon injection of an alkaline fluid into an acidic, iron-rich solution, we observe a diverse set of precipitation morphologies, mainly controlled by flow rate and ion concentration. Using microscope imaging and pH-dependent dyes, we show that finger-like precipitates can facilitate formation and maintenance of microscale pH gradients and accumulation of dispersed particles in confined geometries. Our findings establish a model to investigate the potential of gradients across a semipermeable boundary for early compartmentalization, accumulation, and chemical reactions at the origins of life.
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Affiliation(s)
- Maximilian Weingart
- Systems Biophysics and Center for NanoScience (CeNS), Ludwig-Maximilians University Munich, Amalienstraße 54, 80799 München, Germany
| | - Siyu Chen
- Max Planck Institute for Dynamics and Self-Organization, Am Faßberg 17, 37077 Göttingen, Germany
| | - Clara Donat
- TUM School of Natural Sciences, Department of Bioscience; Center for Protein Assemblies (CPA), Technical University of Munich, Ernst-Otto-Fischer-Str. 8, 85748 Garching b. München, Germany
| | - Vanessa Helmbrecht
- Department of Earth and Environmental Sciences, Ludwig-Maximilians University Munich, Richard-Wagner Straße 10, 80333 München, Germany
| | - William D. Orsi
- Department of Earth and Environmental Sciences, Ludwig-Maximilians University Munich, Richard-Wagner Straße 10, 80333 München, Germany
- GeoBio-CenterLMU, Ludwig-Maximilians University Munich, Richard-Wagner Straße 10, 80333 München, Germany
| | - Dieter Braun
- Systems Biophysics and Center for NanoScience (CeNS), Ludwig-Maximilians University Munich, Amalienstraße 54, 80799 München, Germany
| | - Karen Alim
- Max Planck Institute for Dynamics and Self-Organization, Am Faßberg 17, 37077 Göttingen, Germany
- TUM School of Natural Sciences, Department of Bioscience; Center for Protein Assemblies (CPA), Technical University of Munich, Ernst-Otto-Fischer-Str. 8, 85748 Garching b. München, Germany
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Šponer JE, Šponer J, Výravský J, Matyášek R, Kovařík A, Dudziak W, Ślepokura K. Crystallization as a selection force at the polymerization of nucleotides in a prebiotic context. iScience 2023; 26:107600. [PMID: 37664611 PMCID: PMC10470394 DOI: 10.1016/j.isci.2023.107600] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2023] [Revised: 07/14/2023] [Accepted: 08/08/2023] [Indexed: 09/05/2023] Open
Abstract
Accumulation and selection of nucleotides is one of the most challenging problems surrounding the origin of the first RNA molecules on our planet. In the current work we propose that guanosine 3',5' cyclic monophosphate could selectively crystallize upon evaporation of an acidic prebiotic pool containing various other nucleotides. The conditions of the evaporative crystallization are fully compatible with the subsequent acid catalyzed polymerization of this cyclic nucleotide reported in earlier studies and may be relevant in a broad range of possible prebiotic environments. Albeit cytidine 3',5' cyclic monophosphate has the ability to selectively accumulate under the same conditions, its crystal structure is not likely to support polymer formation.
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Affiliation(s)
- Judit E. Šponer
- Institute of Biophysics of the Czech Academy of Sciences, Královopolská 135, 61200 Brno, Czech Republic
| | - Jiří Šponer
- Institute of Biophysics of the Czech Academy of Sciences, Královopolská 135, 61200 Brno, Czech Republic
| | - Jakub Výravský
- TESCAN Brno, s.r.o, Libušina třída 1, 62300 Brno, Czech Republic
- Department of Geological Sciences, Faculty of Science, Masaryk University, Kotlářská 2, 61137 Brno, Czech Republic
| | - Roman Matyášek
- Institute of Biophysics of the Czech Academy of Sciences, Královopolská 135, 61200 Brno, Czech Republic
| | - Aleš Kovařík
- Institute of Biophysics of the Czech Academy of Sciences, Královopolská 135, 61200 Brno, Czech Republic
| | - Wojciech Dudziak
- University of Wrocław, Faculty of Chemistry, 14 F. Joliot-Curie, 50-383 Wrocław, Poland
| | - Katarzyna Ślepokura
- University of Wrocław, Faculty of Chemistry, 14 F. Joliot-Curie, 50-383 Wrocław, Poland
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