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Cooperative Binding of Transcription Regulators02:13

Cooperative Binding of Transcription Regulators

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Transcriptional regulators bind to specific cis-regulatory sequences in the DNA to regulate gene transcription. These cis-regulatory sequences are very short, usually less than ten nucleotide pairs in length. The short length means that there is a high probability of the exact same sequence randomly occurring throughout the genome.  Since regulators can also bind to groups of similar sequences, this further increases the chances of random binding. Transcriptional regulators form...
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DNA as a Genetic Template02:05

DNA as a Genetic Template

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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...
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DNA Helicases00:55

DNA Helicases

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DNA unwinding helicase enzymes are a type of motor protein. Motor proteins can translocate along filaments or polymers using energy generated from ATP hydrolysis. Helicases are involved in all the important cellular processes where DNA unwinding is required, such as DNA replication, repair, recombination, and transcription. They are present in all living organisms, but vary in their structure, function, and mechanism of action. For example, in prokaryotes, DnaB helicase binds and translocates...
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DNA Replication02:40

DNA Replication

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DNA replication involves the separation of the two strands of the double helix, with each strand serving as a template from which the new complementary strand is copied.  After replication, each double-stranded DNA includes one parental or “old” strand and one “new” strand. This is known as semiconservative replication. The resulting DNA molecules have the same sequence and are divided equally into the two daughter cells.
Replication in Prokaryotes
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The DNA Helix01:16

The DNA Helix

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Translesion DNA Polymerases02:10

Translesion DNA Polymerases

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Translesion (TLS) polymerases rescue stalled DNA polymerases at sites of damaged bases by replacing the replicative polymerase and installing a nucleotide across the damaged site. Doing so, TLS allows additional time for the cell to repair the damage before resuming regular DNA replication.
TLS polymerases are found in all three domains of life - archaea, bacteria, and eukaryotes. Of the different classes of TLS polymerases, members of the Y family are fitted with specialized structures that...
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Video Experimental Relacionado

Updated: Oct 20, 2025

Promoter Capture Hi-C: High-resolution, Genome-wide Profiling of Promoter Interactions
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Promoter Capture Hi-C: High-resolution, Genome-wide Profiling of Promoter Interactions

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Un catalizador de ADN cooperativo

Dallas N Taylor1,2, Samuel R Davidson3, Lulu Qian2,3

  • 1Computation and Neural Systems, California Institute of Technology, Pasadena, California 91125, United States.

Journal of the American Chemical Society
|September 15, 2021
PubMed
Resumen
Este resumen es generado por máquina.

Los investigadores desarrollaron un nuevo catalizador de ADN cooperativo para el procesamiento de información molecular. Este sistema simple y modular utiliza dos señales para impulsar la producción de salida, mejorando el control y la eficiencia en los circuitos basados en ADN.

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Área de la Ciencia:

  • Biología molecular
  • La bioquímica
  • Biología sintética

Sus antecedentes:

  • Los catalizadores de ADN son cruciales para los circuitos de procesamiento de información molecular.
  • El control alostérico mejora la activación temporal de los catalizadores de ADN.
  • Los catalizadores de ADN existentes ofrecen modularidad y control limitados.

Objetivo del estudio:

  • Introducir un nuevo catalizador de ADN cooperativo.
  • Investigar métodos para el control alostérico en la catálisis del ADN.
  • Mejorar la eficiencia y la robustez en el cálculo molecular basado en el ADN.

Principales métodos:

  • Diseñó un sistema de catalizador cooperativo que utiliza dos reacciones reversibles.
  • Utilizó un toque de disociación para controlar la cinética de la reacción.
  • Incorpora un par de bases para mejorar la robustez del activador.
  • Principios de desplazamiento de hebras utilizados para el funcionamiento del catalizador.

Principales resultados:

  • Catálisis cooperativa demostrada en la que las especies de señales de entrada y de activación impulsan la producción de salida.
  • Se mostró una producción de salida casi completa a bajas concentraciones de señal (0,1x la concentración de la puerta).
  • Se ha validado el papel del pie de disociación y el par de bases oscilantes en el rendimiento del sistema.

Conclusiones:

  • El catalizador de ADN cooperativo ofrece un diseño simple y modular para la computación molecular.
  • Este sistema amplía el conjunto de herramientas para circuitos de ADN basados en el desplazamiento de hebras.
  • El diseño facilita el cálculo de propósito general y los sistemas moleculares dinámicos.