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Videos de Conceptos Relacionados

Nuclear Protein Sorting01:34

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...
Nuclear Localization Signals and Import01:46

Nuclear Localization Signals and Import

Proteins targeted to the nucleus carry short stretches of amino acid sequences called the nuclear localization signal or NLS. Classical nuclear localization signals are of two types: monopartite and bipartite NLS. Monopartite classical NLS (cNLS) consists of a single cluster of 4-8 amino acids. Bipartite cNLS consists of two clusters of  2-3 amino acids and a 9-12 residue long proline-rich linker bridging the two clusters. Signal clusters are rich in positively charged amino acids such as...
Nuclear Export01:42

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...
Regulation of Nuclear Protein Sorting01:45

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...
Covalently Linked Protein Regulators02:04

Covalently Linked Protein Regulators

Proteins can undergo many types of post-translational modifications, often in response to changes in their environment. These modifications play an important role in the function and stability of these proteins. Covalently linked molecules include functional groups, such as methyl, acetyl, and phosphate groups, and also small proteins, such as ubiquitin. There are around 200 different types of covalent regulators that have been identified.
These groups modify specific amino acids in a protein.
Western Blotting01:15

Western Blotting

Western blotting is an analytical technique for protein identification. It has various applications in immunology and medicine, including detecting diseases like bovine spongiform encephalopathy, mad cow disease, and human and feline immunodeficiency virus from biological samples.
The technique begins with separating proteins from the sample using sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE), followed by protein transfer, immunoblotting, and finally, protein detection.

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Video Experimental Relacionado

Updated: Jul 9, 2026

Detection of Post-translational Modifications on Native Intact Nucleosomes by ELISA
07:13

Detection of Post-translational Modifications on Native Intact Nucleosomes by ELISA

Published on: April 26, 2011

Las balizas moleculares de ácido nucleico bloqueadas son balizas moleculares bloqueadas.

Lin Wang1, Chaoyong James Yang, Colin D Medley

  • 1Center for Research at Bio/nano Interface, Department of Chemistry, UF Genetics Institute, Gainesville, Florida 32611-7200, USA.

Journal of the American Chemical Society
|November 10, 2005
PubMed
Resumen

Un nuevo Faro Molecular de Ácido Nucleico Bloqueado (LNA-MB) ofrece una mayor estabilidad y una detección precisa del ADN. Esta avanzada sonda molecular es ideal para estudios sensibles de hibridación in vivo.

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Last Updated: Jul 9, 2026

Detection of Post-translational Modifications on Native Intact Nucleosomes by ELISA
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Área de la Ciencia:

  • La bioquímica es la bioquímica.
  • Biología Molecular Biología Molecular
  • Química del ácido nucleico Química del ácido nucleico

Sus antecedentes:

  • Las balizas moleculares (MB) son cruciales para la detección de ácido nucleico.
  • Los MB existentes se enfrentan a limitaciones de estabilidad y especificidad.
  • Se necesitan avances en los análogos de ácido nucleico para mejorar el rendimiento.

Objetivo del estudio:

  • Para diseñar y caracterizar una novela Bloqueado Acido Nucleico-Molecular Beacon (LNA-MB).
  • Para evaluar la estabilidad térmica y la resistencia a la nucleasa del LNA-MB.
  • Para evaluar su discriminación de desajuste de una sola base y sus propiedades de unión a las proteínas.

Principales métodos:

  • Diseño y síntesis de la sonda LNA-MB.
  • Análisis de la temperatura de fusión (Tm) para la estabilidad térmica.
  • Ensayos de digestión de nucleasa para determinar la estabilidad.
  • Estudios de hibridación con secuencias de coincidencia perfecta y no coincidencia.
  • Ensayos de unión con proteínas de unión al ADN de cadena única.

Principales resultados:

  • El LNA-MB demostró una temperatura de fusión muy alta y una estabilidad térmica superior.
  • Se observó una excepcional capacidad de discriminación por falta de coincidencia de una sola base.
  • El LNA-MB mostró una estabilidad significativa contra la digestión de la nucleasa.
  • No se detectó ninguna unión con proteínas de unión al ADN de un solo hilo.

Conclusiones:

  • La nueva LNA-MB exhibe una mayor estabilidad y especificidad.
  • Sus propiedades lo hacen adecuado para exigentes aplicaciones biológicas.
  • Los LNA-MB son muy prometedores para los estudios de hibridación in vivo y el diagnóstico.