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DNA as a Genetic Template02:05

DNA as a Genetic Template

Two structural features of the DNA molecule provide a basis for the mechanisms of heredity: the four nucleotide bases and its double-stranded nature. The Watson-Crick model of double-helical DNA structure, proposed in 1952, drew heavily upon the X-ray crystallography work of researchers Rosalind Franklin and Maurice Wilkins. Watson, Crick, and Wilkins jointly received the Nobel Prize in Physiology or Medicine for their work in 1962. Franklin was, controversially, excluded from the prize for...
Maxam-Gilbert Sequencing01:05

Maxam-Gilbert Sequencing

In the same year as the discovery of the Sanger sequencing method, another group of scientists, Allan Maxam and Walter Gilbert, demonstrated their chemical-cleavage method for DNA sequencing. The Maxam-Gilbert method relies on using different chemicals that can cleave the DNA sequence at specific sites, the separation of resulting DNA fragments of variable size using electrophoresis, and deciphering the DNA sequence from the resulting gel bands.
Challenges of the Maxam-Gilbert Method
The...
DNA as a Genetic Template02:05

DNA as a Genetic Template

Two structural features of the DNA molecule provide a basis for the mechanisms of heredity: the four nucleotide bases and its double-stranded nature. The Watson-Crick model of double-helical DNA structure, proposed in 1952, drew heavily upon the X-ray crystallography work of researchers Rosalind Franklin and Maurice Wilkins. Watson, Crick, and Wilkins jointly received the Nobel Prize in Physiology or Medicine for their work in 1962. Franklin was, controversially, excluded from the prize for...
Nucleic Acids and Nucleotides01:20

Nucleic Acids and Nucleotides

Nucleic acids are the most important macromolecules for the continuity of life. They carry the cell's genetic blueprint and have instructions for its functioning. The two main types of nucleic acids are deoxyribonucleic acid (DNA) and ribonucleic acid (RNA).
Deoxyribonucleic Acid (DNA)
DNA is the genetic material in all living organisms, ranging from single-celled bacteria to multicellular mammals. It is in the nucleus of eukaryotes and the organelles such as chloroplasts and mitochondria. In...
Nucleic Acid Structure01:25

Nucleic Acid Structure

The pentose sugar in DNA is deoxyribose, while in RNA the pentose sugar is ribose. The difference between the sugars is the presence of the hydroxyl group on the ribose's second carbon and a hydrogen on the deoxyribose's second carbon. The phosphate residue attaches to the hydroxyl group of the 5′ carbon of one sugar and the hydroxyl group of the 3′ carbon of the sugar of the next nucleotide, which forms  a 5′ to 3′ phosphodiester linkage.
DNA Structure
DNA has a double-helix structure. The...
Biosynthesis of Nucleic Acids01:28

Biosynthesis of Nucleic Acids

Nucleic acid biosynthesis is a fundamental biochemical process that produces the purine and pyrimidine nucleotides essential for DNA and RNA synthesis. This pathway maintains a balanced nucleotide pool, preventing imbalances that could jeopardize genetic integrity and cellular function. Given the crucial role of nucleotides, their synthesis is tightly regulated to ensure proper cellular homeostasis.Purine BiosynthesisThe biosynthesis of purine nucleotides begins with ribose-5-phosphate, a...

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Video Experimental Relacionado

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Simultaneous Mapping and Quantitation of Ribonucleotides in Human Mitochondrial DNA
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Simultaneous Mapping and Quantitation of Ribonucleotides in Human Mitochondrial DNA

Published on: November 14, 2017

La ligadura de oligonucleótidos dirigida por la plantilla en la hidroxilapatita.

O L Acevedo1, L E Orgel

  • 1The Salk Institute for Biological Studies, San Diego, California 92138, USA.

Nature
|June 19, 1986
PubMed
Resumen

Las superficies minerales pueden haber facilitado las reacciones químicas de la vida temprana. Este estudio muestra que las superficies de hidroxilapatita permiten la síntesis cíclica de polímeros, imitando las condiciones prebióticas para la formación de ARN y polipéptidos.

Palabras clave:
La disciplina de la NASA es la exobiología.No perteneciente al Centro de la NASA.

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Área de la Ciencia:

  • El origen de la vida Estudios sobre el origen de la vida
  • Química prebiótica Química prebiótica es la química de los prebióticos.
  • Síntesis de Biopolímeros por Síntesis de Biopolímeros

Sus antecedentes:

  • Las superficies sólidas, como los minerales, se proponen como catalizadores para la síntesis prebiótica de precursores de biopolímeros.
  • Esto es análogo a las técnicas modernas de síntesis de fase sólida.
  • Trabajos previos mostraron que los oligonucleótidos en la hidroxilapatita modelan la oligomerización del 2-metillimidazolido de guanosina (2-MeImpG).

Objetivo del estudio:

  • Para probar esquemas para la síntesis de polímeros prebióticos en superficies minerales.
  • Desarrollar una reacción adecuada para estudiar la síntesis prebiótica cíclica en la hidroxilapatita.

Principales métodos:

  • Se investigó una reacción secuencial que involucra la reactivación de oligo (G) y la ligadura.
  • Utilizado fosforimidazolidos intermedios y poli (C) como una plantilla.
  • Comparación de las reacciones superficiales de la hidroxilapatita con las reacciones en fase líquida.

Principales resultados:

  • Se demostró con éxito una secuencia de reacción cíclica en superficies de hidroxilapatita.
  • Este proceso cíclico implicó la reactivación de oligo (((G) s a los fosforimidazolidos y la posterior ligadura.
  • La reacción ligada a la superficie permitió ciclos repetidos, a diferencia de la fase líquida.

Conclusiones:

  • Las superficies de hidroxilapatita facilitan una síntesis de polímeros eficiente y cíclica similar a la prebiótica.
  • Este sistema proporciona un modelo viable para estudiar el papel de las superficies minerales en el origen de la vida.
  • La reacción desarrollada es ideal para ciclos repetidos, superando las limitaciones de la síntesis en fase líquida.