Video Experimental Relacionado
Updated: Jul 19, 2026

12:13
Single-Molecule Imaging of Nuclear Transport
Published on: June 9, 2010
Un nuevo complejo de nucleoporinas, que incluye Sec13p y un homólogo de Sec13p, es esencial para los poros nucleares
S Siniossoglou1, C Wimmer, M Rieger
1European Molecular Biology Laboratory, Heidelberg Federal Republic of Germany.
Cell
|January 26, 1996
Resumen
Una nueva proteína de poro nuclear, Nup84p, y su complejo asociado son cruciales para el montaje y la función de los poros nucleares. Este complejo, que incluye Nup120p y Nup85p, es esencial para la organización de la membrana nuclear y el transporte de ARN.
Área de la Ciencia:
- Biología celular Biología celular.
- Biología molecular La biología molecular.
- Genética La genética.
Sus antecedentes:
- Los complejos de poros nucleares (NPC) regulan el transporte entre el núcleo y el citoplasma.
- Comprender la biogénesis de las NPC es clave para la función celular y la enfermedad.
Objetivo del estudio:
- Para identificar nuevas proteínas involucradas en el ensamblaje del complejo de poros nucleares (NPC).
- Para caracterizar la función de una proteína de poro nuclear recientemente identificada, Nup84p, y su complejo asociado.
Principales métodos:
- Cribado genético para identificar los componentes que interactúan con las nucleoporinas.
- Aislamiento e identificación de complejos proteicos mediante purificación por afinidad (Sec13p-ProtA).
- Disrupción genética y análisis de fenotipos celulares.
Principales resultados:
- Se identificó una nueva proteína de poro nuclear, Nup84p, homóloga a la Nup107p de los mamíferos.
- Nup84p forma un complejo con Nup120p, Nup85p, Sec13p y un homólogo de Sec13p.
- Se encontró que Sec13p existe en dos complejos proteicos distintos.
- La interrupción de los genes Nup84p, Nup85p o Nup120p condujo a defectos en la membrana nuclear y la organización de las NPC, y al deterioro del transporte de ARN poli (A) +.
Conclusiones:
- El complejo Nup84p, junto con las proteínas de tipo Sec13, juega un papel vital en la biogénesis de los poros nucleares.
- La organización adecuada de la membrana nuclear y la estructura NPC depende de este complejo.
- Los hallazgos proporcionan nuevos conocimientos sobre los mecanismos moleculares subyacentes a la formación y función de los poros nucleares.
Videos de Conceptos Relacionados
Nuclear Export of mRNA
Before mRNAs are exported to the cytoplasm, it is crucial to check each mRNA for structural and functional integrity. Eukaryotic cells use several different mechanisms, collectively known as mRNA surveillance, to look for irregularities in mRNAs. Irregular or aberrant mRNA are rapidly degraded by various enzymes. If a defective mRNA escapes the surveillance, it would be translated into a protein which would either be non-functional or not function properly. One of the primary irregularities in...
Nuclear Protein Sorting
Nuclear protein sorting is the selective trafficking of histones, polymerases, gene regulatory proteins into the nucleus and exporting RNAs and ribosomes to the cytosol. It is a tightly controlled process that regulates gene expression within a cell.
Proteins targeted to the nucleus carry nuclear localization signals or NLS recognized by import receptors in the cytosol. Similarly, proteins with nuclear export signals are recognized by export receptors. Import and export receptors are...
Proteins targeted to the nucleus carry nuclear localization signals or NLS recognized by import receptors in the cytosol. Similarly, proteins with nuclear export signals are recognized by export receptors. Import and export receptors are...
Nuclear Export
The nucleus restricts several proteins within and allows others to pass. The restricted proteins possess a nuclear retention sequence or NRS, anchoring them to the nuclear lamins and preventing their transport to the cytosol. The non-restricted proteins, after their synthesis, are transported to their site of action, such as the cytosol or other organelles, with the help of nuclear export signals or NES.
NES are of three types- the canonical 10-residue long leucine-rich signal and other...
NES are of three types- the canonical 10-residue long leucine-rich signal and other...
Regulation of Nuclear Protein Sorting
Nuclear protein sorting regulates nucleus composition and gene expression, crucial for determining the fate of a eukaryotic cell. Hence, the entry and exit of molecules across the nuclear envelope is a tightly controlled process. Nuclear protein sorting can be inhibited by one of the following ways: 1) masking cargo signal sequences, 2) modifying the nuclear receptor's affinity for cargo, 3) controlling the nuclear pore size, 4) retaining the cargo during its transit to the cytosol or the...
Protein Translocation Machinery on the ER Membrane
The translocon complex situated on the ER membrane is the main gateway for the protein secretory pathway. It facilitates the transport of nascent peptides into the ER lumen and their insertion into the ER membrane.
Sec61 protein conducting channel
In eukaryotes, the translocon complex comprises a core heterotrimeric translocator channel called the Sec61 complex. This channel includes three transmembrane proteins, Sec61α, Sec61β, and Sec61γ, and is the largest subunit of the translocon complex.
Sec61 protein conducting channel
In eukaryotes, the translocon complex comprises a core heterotrimeric translocator channel called the Sec61 complex. This channel includes three transmembrane proteins, Sec61α, Sec61β, and Sec61γ, and is the largest subunit of the translocon complex.
Nuclear Export of mRNA
Before mRNAs are exported to the cytoplasm, it is crucial to check each mRNA for structural and functional integrity. Eukaryotic cells use several different mechanisms, collectively known as mRNA surveillance, to look for irregularities in mRNAs. Irregular or aberrant mRNA are rapidly degraded by various enzymes. If a defective mRNA escapes the surveillance, it would be translated into a protein which would either be non-functional or not function properly. One of the primary irregularities in...

