![Outline of construction of plasmids carrying LUCA and E. coli tRNA genes and codon test genes. A LUCA and E. coli tRNA genes. Pairs of tRNA genes from E. coli and LUCA with identical anticodon sequences were synthesized. Primers (Supplementary Table S2) were used to amplify the transcription templates for in vitro synthesis. B Codon test genes. The constructs were based on the pET23a vector. Test genes were inserted between the NdeI and BamHI sites, with the start codons included in the NdeI site. -- [Journal of Molecular Evolution]](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/07/Resurrecting-tRNAs.png?resize=1200%2C716&ssl=1)
[Journal of Molecular Evolution] Ancestral sequence reconstruction (ASR) was used to study the evolution of the translational system by inferring tRNA sequences of the Last Archaeal Common Ancestor (LACA), the […]
tRNA
Posted inBiochemistry & Organic Chemistry, Biophysics, Biosignatures & Paleobiology, Genomics, Proteomics, Bioinformatics, Origin & Evolution of Life, Status Report
The Evolution Of The First Code
Background/Objectives: tRNAs, tRNAomes, aminoacyl-tRNA synthetases (AARSs), the first proteins, ribosomes and the genetic code coevolved. We utilize sequence data to reconstruct key steps in establishing the first code on Earth.
Posted inBiochemistry & Organic Chemistry, Biogeochemical Cycles & Geobiology, Biosignatures & Paleobiology, Genomics, Proteomics, Bioinformatics, Origin & Evolution of Life, Status Report
A Recipe to Evolve Complex Life Chemically on Earth
Sequences of tRNAs are highly patterned in easily identifiable RNA repeats and RNA inverted repeats (stem-loop-stems). Because of patterning, the multi-step evolution of tRNA can be described in remarkable detail.
Posted inBiochemistry & Organic Chemistry, Genomics, Proteomics, Bioinformatics, Origin & Evolution of Life, Status Report
Tracing The Origin Of Earth Life’s Genetic Code To Early Protein Structures
Genes are the building blocks of life, and the genetic code provides the instructions for the complex processes that make organisms function. But how and why did it come to […]
Posted inBiogeochemical Cycles & Geobiology, Biophysics, Biosignatures & Paleobiology, Genomics, Proteomics, Bioinformatics, Origin & Evolution of Life, Status Report
On the Origin of Information Dynamics in Early Life
We hypothesize that predictable variations in environmental conditions caused by night/day cycles created opportunities and hazards that initiated information dynamics central to life’s origin.
Posted inBiochemistry & Organic Chemistry, Biophysics, Genomics, Proteomics, Bioinformatics, Origin & Evolution of Life, Status Report
Structural Enzymology, Phylogenetics, Differentiation, and Symbolic Reflexivity at the Dawn of Biology
The reflexive translation of symbols in one chemical language to another defined genetics. Yet, the co-linearity of codons and amino acids is so commonplace an idea that few even ask […]
Posted inBiochemistry & Organic Chemistry, Biophysics, Biosignatures & Paleobiology, Commercial & Private Sector, Genomics, Proteomics, Bioinformatics, Nanotechnology & SynBio, Origin & Evolution of Life, Press Release
Earth Life’s Genetic Alphabet Has Been Expanded To Create Novel Proteins
It’s a dogma taught in every introductory biology class: Proteins are composed of combinations of 20 different amino acids, arranged into diverse sequences like words. But researchers trying to engineer […]
Posted inAstropharmacy / Biotechnology, Biochemistry & Organic Chemistry, Biophysics, Biosignatures & Paleobiology, Commercial & Private Sector, Genomics, Proteomics, Bioinformatics, Nanotechnology & SynBio, Origin & Evolution of Life, Press Release
New Study Unveils RNA’s Role In Early Life And Future Bioengineering
The beginning of life on Earth and its evolution over billions of years continue to intrigue researchers worldwide. The central dogma or the directional flow of genetic information from a […]
![Coupled evolutionary advances favoring emergence and fostering the specialization of genetic coding. (a). Interdependences involved in embedding specific recognition into the sequence space of folded proteins [26]. (b). Experimentally measurable metrics corresponding to (a). Although experimental models exist for each process, confirming details requires further work. -- LIFE](https://i0.wp.com/astrobiology.com/wp-content/uploads/2024/02/Base-Pairing.png?resize=1200%2C718&ssl=1)
Posted inBiochemistry & Organic Chemistry, Biophysics, Genomics, Proteomics, Bioinformatics, Origin & Evolution of Life, Status Report
Base Pairing Promoted the Self-Organization of Genetic Coding, Catalysis, and Free-Energy Transduction
How Nature discovered genetic coding is a largely ignored question, yet the answer is key to explaining the transition from biochemical building blocks to life. Other, related puzzles also fall […]
![Type II tRNA evolved via RNA ligation and a 9 nt internal deletion within ligated 3′- and 5′-acceptor stems [42]. Also, 3 31 nt minihelices (one D loop minihelix (magenta 17 nt core) and two anticodon stem-loop-stem minihelices (blue 17 nt core)) were fused by ligation for minihelix replication. The 93 nt tRNA precursor was processed by an internal 9 nt deletion (see below) within fused 3′-acceptor (yellow) and 5′-acceptor (green) stems. In the type II tRNA structure, the red arrow indicates the fusion of the magenta segment (17 nt D loop minihelix core; UAGCC repeat) and the green segment (5′-acceptor stem fragment; initially GGCGG). Abbreviations: SLS) stem-loop-stem; Ac) anticodon. Molecular graphics were created using ChimeraX [43]. -- Life](https://i0.wp.com/astrobiology.com/wp-content/uploads/2023/11/The331NucleotideMinihelix.png?resize=1200%2C720&ssl=1)
Posted inGenomics, Proteomics, Bioinformatics, Origin & Evolution of Life, Status Report
The 3 31 Nucleotide Minihelix tRNA Evolution Theorem and the Origin of Life
There are no theorems (proven theories) in the biological sciences. We propose that the 3 31 nt minihelix tRNA evolution theorem be universally accepted as one.