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Real-Time Monitoring of Aurora kinase A Activation using Conformational FRET Biosensors in Live Cells
Published on: July 30, 2020
Survivin lee la histona fosforilada H3 threonine 3 para activar la cinasa mitótica Aurora B y así activar la proteína
Alexander E Kelly1, Cristina Ghenoiu, John Z Xue
1Laboratory of Chromosome and Cell Biology, The Rockefeller University, New York, NY 10065, USA. akelly@rockefeller.edu
Science (New York, N.Y.)
|August 14, 2010
Resumen
La fosforilación mitótica de la histona en la threonina 3 es reconocida por Survivin, reclutando el complejo pasajero cromosómico (CPC). Esto asegura una división celular precisa mediante la activación de la aurora B quinasa para el ensamblaje del huso.
Área de la Ciencia:
- Biología celular Biología celular.
- Biología Molecular Biología Molecular
- La bioquímica es la bioquímica.
Sus antecedentes:
- La fosforilación de histonas es un sello distintivo de la mitosis, pero su importancia funcional es en gran medida desconocida.
- El complejo de pasajeros cromosómicos (CPC) juega un papel crítico en la mitosis, incluyendo el ensamblaje del huso y la segregación cromosómica.
Objetivo del estudio:
- Para aclarar el papel de la fosforilación de la histona H3 en la treonina 3 (H3T3) durante la mitosis.
- Para investigar la interacción entre H3T3 y el complejo pasajero cromosómico (CPC).
Principales métodos:
- Pruebas bioquímicas para detectar la fosforilación H3T3.
- Análisis del dominio BIR de Survivin para la unión H3T3.
- Investigando el efecto de la modulación de la actividad de la quinasa de Haspin en la localización y función de CPC.
Principales resultados:
- La histona H3 fosforilada en treonina 3 (H3T3) es reconocida directamente por el dominio BIR de Survivin dentro del CPC.
- Esta interacción media el reclutamiento de CPC a los cromosomas y activa la subunidad de kinasa Aurora B.
- La modulación de la actividad de Haspin, que fosforila H3T3, causa defectos en el ensamblaje del huso dependiente de Aurora B y en la reformación nuclear.
Conclusiones:
- La fosforilación de la histona mitótica H3T3 desempeña un papel celular directo para garantizar una división celular precisa.
- El CPC lee y traduce la fosforilación H3T3 a través de Survivin para regular los eventos mitóticos clave.
- Este mecanismo pone de relieve un vínculo crítico entre las modificaciones histónicas y la regulación de la segregación cromosómica.
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