Video Experimental Relacionado
Updated: Jul 17, 2026

11:40
Preparation of the Mgm101 Recombination Protein by MBP-based Tagging Strategy
Published on: June 25, 2013
La recombinación específica del sitio mediada por hin requiere dos sitios de recombinación de 26 bp y un potenciador
Cell
|July 1, 1985
Resumen
La conmutación del gen de la flagelina de Salmonella está mediada por la inversión del ADN. Los investigadores identificaron componentes clave, incluida la proteína Hin y un potenciador de la recombinación, esenciales para este proceso de recombinación específico del sitio in vitro.
Área de la Ciencia:
- Biología Molecular Biología Molecular
- Genética La genética.
- Microbiología Microbiología.
Sus antecedentes:
- Las especies de salmonela exhiben expresión alterna de los genes de la flagelina.
- Este fenómeno está regulado por la inversión de un segmento específico de ADN.
- Comprender el mecanismo molecular es crucial para la genética microbiana.
Objetivo del estudio:
- Para investigar los componentes moleculares y los requisitos del sistema de inversión de ADN específico del sitio mediado por Hin.
- Para caracterizar el papel de un potenciador recombinante en el proceso de inversión.
- Para analizar la secuencia y las características estructurales de los sitios de recombinación.
Principales métodos:
- Análisis in vitro de la recombinación específica del sitio utilizando un sistema derivado de E. coli.
- Caracterización bioquímica de la proteína Hin y los factores huésped.
- Construcción y prueba de sitios de recombinación y potenciadores de tipo silvestre y mutante sintéticos.
Principales resultados:
- La inversión eficiente del ADN requiere la proteína Hin y un factor huésped sensible a la proteinasa K.
- Un potenciador recombinante de 60 bp aumenta significativamente la tasa de inversión.
- El potenciador funciona independientemente de su ubicación y requiere una orientación relativa específica de sus dominios.
- El análisis de los sitios de recombinación mutante identificó secuencias críticas y elementos estructurales.
Conclusiones:
- El estudio aclara los actores moleculares clave y los elementos de ADN involucrados en la conmutación de genes de flagelina de Salmonella.
- Los hallazgos proporcionan información sobre el mecanismo de la recombinación específica del sitio mediada por Hin.
- Esta investigación contribuye a la comprensión de la regulación génica en las bacterias.
Videos de Conceptos Relacionados
Fixing Double-strand Breaks
The double-stranded structure of DNA has two major advantages. First, it serves as a safe repository of genetic information where one strand serves as the back-up in case the other strand is damaged. Second, the double-helical structure can be wrapped around proteins called histones to form nucleosomes, which can then be tightly wound to form chromosomes. This way, DNA chains up to 2 inches long can be contained within microscopic structures in a cell. A double-stranded break not only damages...
Homologous Recombination
The basic reaction of homologous recombination (HR) involves two chromatids that contain DNA sequences sharing a significant stretch of identity. One of these sequences uses a strand from another as a template to synthesize DNA in an enzyme-catalyzed reaction. The final product is a novel amalgamation of the two substrates. To ensure an accurate recombination of sequences, HR is restricted to the S and G2 phases of the cell cycle. At these stages, the DNA has been replicated already and the...
Conservative Site-specific Recombination and Phase Variation
Because the DNA segments are cut and reorganized in a direction-specific manner, site-specific recombination has emerged as an efficient genetic engineering technique. Flippase and Cyclization recombinases or Flp and Cre, respectively, are two members of the tyrosine recombinase family derived from bacteriophages, that are used to mediate site-specific DNA insertions, deletions, and targeted expression of proteins in mammalian cell lines.
The recognition sites for Cre recombinase called LoxP...
The recognition sites for Cre recombinase called LoxP...
Exon Recombination
The evolution of new genes is critical for speciation. Exon recombination, also known as exon shuffling or domain shuffling, is an important means of new gene formation. It is observed across vertebrates, invertebrates, and in some plants such as potatoes and sunflowers. During exon recombination, exons from the same or different genes recombine and produce new exon-intron combinations, which might evolve into new genes.
Exon shuffling follows “splice frame rules.” Each exon has three reading...
Exon shuffling follows “splice frame rules.” Each exon has three reading...
Homologous Recombination
The basic reaction of homologous recombination (HR) involves two chromatids that contain DNA sequences sharing a significant stretch of identity. One of these sequences uses a strand from another as a template to synthesize DNA in an enzyme-catalyzed reaction. The final product is a novel amalgamation of the two substrates. To ensure an accurate recombination of sequences, HR is restricted to the S and G2 phases of the cell cycle. At these stages, the DNA has been replicated already and the...
Crossing Over
Crossing over is the exchange of genetic information between homologous chromosomes during prophase I of meiosis I. Genetic recombination gives rise to allelic diversity in the newly formed daughter cells. In humans, crossing over produces genetically distinct haploid egg and sperm cells that undergo fertilization to produce unique offspring. Before cell division starts, the germ cell’s chromosome(s) undergo duplication in the S phase of the cell cycle. As the cells enter prophase I, duplicated...

