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The basic reaction of homologous recombination (HR) involves two chromatids that contain DNA sequences sharing a significant stretch of identity. One of these sequences uses a strand from another as a template to synthesize DNA in an enzyme-catalyzed reaction. The final product is a novel amalgamation of the two substrates. To ensure an accurate recombination of sequences, HR is restricted to the S and G2 phases of the cell cycle. At these stages, the DNA has been replicated already and the...
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The double-stranded structure of DNA has two major advantages. First, it serves as a safe repository of genetic information where one strand serves as the back-up in case the other strand is damaged. Second, the double-helical structure can be wrapped around proteins called histones to form nucleosomes, which can then be tightly wound to form chromosomes. This way, DNA chains up to 2 inches long can be contained within microscopic structures in a cell. A double-stranded break not only damages...
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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.
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In order to be passed through generations, genomic DNA must be undamaged and error-free. However, every day, DNA in a cell undergoes several thousand to a million damaging events by natural causes and external factors. Ionizing radiation such as UV rays, free radicals produced during cellular respiration, and hydrolytic damage from metabolic reactions can alter the structure of DNA. Damages caused include single-base alteration, base dimerization, chain breaks, and cross-linkage.
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During replication, the complementary strands in double-stranded DNA are synthesized at different rates. Replication first begins on the leading strand. Replication starts later, occurs more slowly, and proceeds discontinuously on the lagging strand.
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Characterizing DNA Repair Processes at Transient and Long-lasting Double-strand DNA Breaks by Immunofluorescence Microscopy
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La cristalografía con resolución de tiempo captura la reparación del ADN impulsada por la luz

Nina-Eleni Christou1, Virginia Apostolopoulou1,2, Diogo V M Melo3

  • 1Center for Free-Electron Laser Science CFEL, Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, 22607 Hamburg, Germany.

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|November 30, 2023
PubMed
Resumen

La fotoliasa utiliza la luz para reparar el ADN mediante la captura de un cofactor de adenina flavina excitado (FAD). Esta enzima facilita la transferencia de electrones al ADN, reparando el daño a través de un nuevo intermedio de enlace único y la liberación gradual del producto.

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Área de la Ciencia:

  • La bioquímica
  • Biología molecular
  • Biología estructural

Sus antecedentes:

  • La fotoliasa es una enzima crucial para la reparación del ADN, que utiliza la energía de la luz para revertir el daño inducido por los rayos UV.
  • Comprender el mecanismo catalítico de la fotoliasa es esencial para comprender las vías de reparación del ADN.

Objetivo del estudio:

  • Para dilucidar los intermediarios de reacción y el mecanismo de la reparación de ADN catalizada por la fotoliasa.
  • Capturar y caracterizar los estados transitorios de la enzima durante su ciclo catalítico.

Principales métodos:

  • Se utilizó la cristalografía de resolución temporal para capturar los intermedios de corta duración.
  • Análisis estructural de complejos enzima-cofactor-ADN en diferentes momentos del tiempo.

Principales resultados:

  • La fotoliasa atrapa el estado excitado del dinucleótido de adenina flavina (FAD) en una conformación doblada.
  • La transferencia de electrones desde el FAD excitado al ADN dañado inicia el proceso de reparación.
  • La reparación del ADN implica un intermediario de un solo enlace, con liberación gradual de las bases de timina.

Conclusiones:

  • El estudio revela un nuevo mecanismo para la reparación del ADN que involucra un estado excitado de FAD doblado y un intermediario de un solo enlace.
  • La liberación gradual del producto, con la 3 'timina expulsada primero, está dictada por el hacinamiento del sitio activo y los enlaces de hidrógeno interrumpidos.