Las resoluciones de la unión de Holliday median la segregación de nucleoides de los cloroplastos

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Yusuke Kobayashi¹, Osami Misumi², Masaki Odahara³

¹Laboratory of Plant Molecular Genetics, Department of Botany, Kyoto University, Oiwake-cho, Kita-Shirakawa, Kyoto 606-8502, Japan.

Science (New York, N.Y.)

|May 13, 2017

Resumen

Los investigadores identificaron el cloroplasto monocariótico 1 (MOC1) como una resolvasa de unión de Holliday crucial en los cloroplastos de las plantas. Este descubrimiento explica cómo se segrega el ADN del cloroplasto, lo que afecta el crecimiento y el desarrollo de las plantas.

Área de la Ciencia:

Biología molecular
Ciencias de las plantas
La genética

Sus antecedentes:

Las uniones de Holliday son estructuras clave del ADN en la recombinación homóloga.
Resolvases desenredan las uniones de Holliday en procariotas y eucariotas.
Los orgánulos de las plantas carecían de resolvases de unión Holliday identificadas hasta ahora.

Objetivo del estudio:

Para identificar la resolvasa de unión de Holliday en los cloroplastos de las plantas.
Investigar el papel de MOC1 en la segregación de los nucleoides de los cloroplastos.
Comprender el mecanismo de MOC1 en las plantas verdes.

Principales métodos:

Análisis de un mutante de Chlamydomonas reinhardtii que carece de segregación nucleoide en los cloroplastos.
Análisis genético de la conservación y expresión de *MOC1* en *Arabidopsis thaliana*.
Análisis in vitro bioquímicos y de microscopía de fuerza atómica de alta velocidad de la actividad de AtMOC1.

Principales resultados:

*MOC1* fue identificado como una resolvasa de unión de cloroplasto Holliday.
La expresión reducida de *MOC1* en *Arabidopsis thaliana* causó defectos de crecimiento y segregación nucleoide aberrante en los cloroplastos.
AtMOC1 une y divide las uniones de Holliday simétricamente en su núcleo.

Conclusiones:

MOC1 es una resolvasa de unión de Holliday conservada en los cloroplastos de plantas verdes.
MOC1 juega un papel vital en la segregación nucleoide de los cloroplastos.
La resolución de la unión de Holliday mediada por MOC1 es esencial para el desarrollo de la planta.

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