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Composición y especificidad de unión al ARN de la metazoana RNasa MRP

Yuan Liu^1,2,3, Shiyang He^1,2,3, Kawon Pyo¹

¹Department of Biochemistry, University of California, Riverside, CA 92521, United States.

Nucleic acids research

|August 28, 2025

Resumen

Los investigadores identificaron nuevas subunidades de proteínas, RMP64 y RMP24, esenciales para la función de la Ribonucleasa MRP (RNasa MRP) en el crecimiento celular y la maduración del ARN ribosomal. Este descubrimiento aclara la composición y los objetivos de la enzima en los mamíferos.

Área de la Ciencia:

Biología molecular
La bioquímica
Biología celular

Sus antecedentes:

La ribonucleasa MRP (RNase MRP) es un complejo ribonucleoproteico crucial para la maduración del ARN ribosómico eucariota (ARNr).
La composición precisa y la especificidad del sustrato de ARN de la RNasa MRP en eucariotas superiores han permanecido en gran medida desconocidas.

Objetivo del estudio:

Identificar las nuevas subunidades proteicas de la metazoana RNasa MRP.
Caracterizar la función de estas subunidades en el procesamiento del ARNr y la viabilidad celular.
Para definir las dianas de ARN in vivo de la RNasa MRP en las células de mamíferos.

Principales métodos:

Identificación y caracterización de las proteínas de las subunidades de RNase MRP.
Ensayos funcionales que evalúan la maduración del ARNr y la proliferación celular.
Estudios de unión al ARN para identificar objetivos in vivo en la resolución de nucleótidos.

Principales resultados:

NEPRO (renombrado RMP64) y C18ORF21 (renombrado RMP24) fueron identificados como subunidades constitutivas específicas de RNase MRP.
RMP64 y RMP24 son parte integral de RNase MRP, estabilizan su ARN catalítico y son esenciales para la maduración del ARNr y la proliferación celular.
Se identificó un conjunto completo de dianas de ARN in vivo para RNase MRP, incluidos sitios específicos de escisión.

Conclusiones:

El estudio identifica las primeras subunidades de proteínas específicas de la metazona RNasa MRP, RMP64 y RMP24.
Estas subunidades son críticas para la estabilidad del complejo, la función en la maduración del ARNr y la proliferación celular.
Los hallazgos delinean el repertorio de orientación de ARN de la RNasa MRP en células de mamíferos, avanzando en la comprensión de esta enzima esencial.

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