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Proofreading

Proofreading

Synthesis of new DNA molecules is carried out by the enzyme DNA polymerase, which adds nucleotides on the daughter strand complementary to the template DNA strand. DNA polymerase has a higher affinity to add the correct base and ensures fidelity during DNA replication. Furthermore, it exhibits proofreading activity during replication, using an exonuclease domain that cuts off incorrect nucleotides from the nascent DNA strand.
Errors During Replication are Corrected by the DNA Polymerase Enzyme

Proofreading

Proofreading

Translesion DNA Polymerases

Translesion DNA Polymerases

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...

DNA Replication

DNA Replication

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
DNA replication uses a large number of...

Homologous Recombination

Homologous Recombination

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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Proofreading and DNA Repair Assay Using Single Nucleotide Extension and MALDI-TOF Mass Spectrometry Analysis

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Published on: June 19, 2018

Observando una ADN polimerasa elige el bien del mal.

Bret D Freudenthal¹, William A Beard, David D Shock

¹Laboratory of Structural Biology, National Institute of Environmental Health Sciences, National Institutes of Health, P.O. Box 12233, Research Triangle Park, NC 27709-2233, USA.

|July 6, 2013

Resumen

Este resumen es generado por máquina.

La ADN polimerasa β utiliza sustratos naturales para revelar intermediarios catalíticos en tiempo real. Las nuevas estructuras muestran cómo los ajustes del sitio activo mejoran la precisión de la síntesis del ADN y la estabilidad del genoma.

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Área de la Ciencia:

La bioquímica es la bioquímica.
Biología Estructural Biología estructural.
Biología Molecular Biología Molecular

Sus antecedentes:

La ADN polimerasa β (pol β) es crucial para la reparación del ADN y la síntesis de llenado de vacíos.
Utiliza dos iones metálicos para la transferencia de nucleotidiles durante la catálisis.
Estudios anteriores se basaron en análogos de sustrato para capturar intermedios catalíticos.

Objetivo del estudio:

Para identificar nuevos intermediarios catalíticos durante la actividad de la ADN polimerasa β.
Comprender los mecanismos moleculares subyacentes a la fidelidad de la polimerasa y la estabilidad del genoma.
Para investigar el papel de los iones metálicos en la síntesis del ADN utilizando sustratos naturales.

Principales métodos:

Se emplean sustratos naturales (nucleótidos correctos e incorrectos) para las reacciones de la ADN polimerasa β.
Determinó 15 estructuras cristalinas distintas para capturar la formación de productos en tiempo real.
Se analizaron los cambios estructurales en el sitio activo durante la inserción de nucleótidos.

Principales resultados:

Se observaron ajustes dinámicos del sitio activo que favorecen la inserción correcta de nucleótidos y desfavorecen la inserción incorrecta.
Se identificó un sitio de unión del tercer metal transitorio formado sólo durante la correcta incorporación de nucleótidos.
Se encontró que la disociación de pirofosfato es más rápida después de la inserción incorrecta de nucleótidos, vinculada al reposicionamiento del subdominio.

Conclusiones:

El estudio revela ajustes moleculares no apreciados previamente en la catálisis de la β polimerasa de ADN.
Un tercer sitio metálico transitorio y los movimientos del subdominio contribuyen a la fidelidad de la polimerasa.
Estos hallazgos ofrecen información sobre el mantenimiento de la estabilidad del genoma a través de una síntesis precisa de ADN.