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The circadian—or biological—clock is an intrinsic, timekeeping, molecular mechanism that allows plants to coordinate physiological activities over 24-hour cycles called circadian rhythms. Photoperiodism is a collective term for the biological responses of plants to variations in the relative lengths of dark and light periods. The period of light-exposure is called the photoperiod.
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Video Experimental Relacionado

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Light-mediated Reversible Modulation of the Mitogen-activated Protein Kinase Pathway during Cell Differentiation and Xenopus Embryonic Development
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La luz controla la localización de proteínas a través de la selección de promotores alternativos mediados por

Tomokazu Ushijima1, Kousuke Hanada2, Eiji Gotoh1

  • 1Faculty of Agriculture, Kyushu University, Fukuoka 812-8581, Japan.

Cell
|November 14, 2017
PubMed
Resumen

El fitocromo fotorreceptor de las plantas utiliza la selección de promotores alternativos para cambiar la localización de las proteínas. Este mecanismo ayuda a las plantas a adaptarse a las condiciones de luz, por ejemplo, mediante la creación de una derivación fotorrespiratoria.

Palabras clave:
promotor alternativoexpresión génicaseñalización luminosafotoinhibiciónfotorrespiraciónFitocromo y sus derivadoslocalización de las proteínas

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Área de la Ciencia:

  • Biología molecular
  • Biología vegetal
  • La genética

Sus antecedentes:

  • El uso de promotores alternativos expande el proteoma produciendo múltiples pre-ARNm de un solo gen.
  • El papel de los promotores alternativos en las respuestas fisiológicas normales no se comprende completamente.

Objetivo del estudio:

  • Investigar cómo el fitocromo fotorreceptor de la planta influye en la selección de promotores alternativos.
  • Comprender el impacto del uso de promotores alternativos en la localización y la función de las proteínas en respuesta a la luz.

Principales métodos:

  • Análisis de todo el genoma de la selección de promotores alternativos en Arabidopsis thaliana.
  • Caracterización de las isoformas de proteínas y su localización subcelular en diferentes condiciones de luz.

Principales resultados:

  • El fitocromo induce cambios en todo el genoma en la selección de promotores alternativos.
  • Las isoformas de proteínas con distintos terminales N exhiben una localización dependiente de la luz.
  • Se identificó una isoforma citoplasmática de la gliceratocinasa (GLYK) en las plantas cultivadas a la sombra, que funciona como un bypass fotorrespiratorio.

Conclusiones:

  • El fitocromo regula la localización de proteínas a través de la selección de promotores alternativos para adaptarse a las fluctuaciones de la luz.
  • El uso de promotores alternativos es una capa reguladora clave en las eucariotas para la diversificación del proteoma y la adaptación del organismo.