Video Experimental Relacionado
Updated: Jul 19, 2026

08:21
Site-specific Bacterial Chromosome Engineering: ΦC31 Integrase Mediated Cassette Exchange (IMCE)
Published on: March 16, 2012
El operón virD de Agrobacterium tumefaciens codifica una endonucleasa específica del sitio
Cell
|November 7, 1986
Resumen
Agrobacterium tumefaciens utiliza la endonucleasa del operón virD para dividir las repeticiones del ADN-T, lo que facilita la formación de tumores. Esta enzima es crucial para la transferencia de ADN plásmido inductor de tumores en los genomas de las plantas.
Área de la Ciencia:
- Biología molecular La biología molecular.
- Patología vegetal patología vegetal.
- Bacteriología Bacteriología.
Sus antecedentes:
- Agrobacterium tumefaciens media la formación de tumores en las plantas mediante la transferencia de ADN-T en el genoma de la planta.
- El proceso de transferencia está regulado por genes de virulencia (virus) codificados en plásmidos.
Objetivo del estudio:
- Para identificar el producto genético específico responsable del procesamiento del ADN-T.
- Para caracterizar la actividad enzimática involucrada en la transferencia de ADN-T.
Principales métodos:
- Análisis genético de cepas mutantes virD.
- Ensayos bioquímicos para la actividad de la endonucleasa.
- Secuencia y análisis de proteínas del operón virD.
Principales resultados:
- El operón virD codifica una endonucleasa específica del sitio.
- Esta endonucleasa divide el ADN-T en secuencias de repetición directa.
- La actividad de la endonucleasa está localizada en el extremo 5' del operón virD, involucrando a dos proteínas.
Conclusiones:
- La endonucleasa codificada por virD es esencial para el procesamiento e integración del ADN-T.
- Esta enzima juega un papel crítico en la vía de transformación mediada por Agrobacterium.
Más Videos Relacionados
Videos de Conceptos Relacionados
Nucleotide Excision Repair
Overview
Nucleotide Excision Repair
Overview
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...
Restriction Enzymes
Restriction enzymes are bacterial enzymes used to cut DNA in a sequence-specific manner. To cleave DNA, they bind to specific palindromic sequences called restriction sites. Such palindromic DNA sequences or inverted repeats are commonly found in regions of functional significance, such as the origin of replication, gene operator sites, and regions containing transcription termination signals.
The host bacteria protect their own genomic DNA from these enzymes by methylating these sites. Some...
The host bacteria protect their own genomic DNA from these enzymes by methylating these sites. Some...
Nucleotide Excision Repair
DNA Distortion and Damage
Cells are regularly exposed to mutagens—factors in the environment that can damage DNA and generate mutations. UV radiation is one of the most common mutagens and is estimated to introduce a significant number of changes in DNA. These include bends or kinks in the structure, which can block DNA replication or transcription. If these errors are not fixed, the damage can cause mutations, which in turn can result in cancer or disease depending on which sequences are...
Cells are regularly exposed to mutagens—factors in the environment that can damage DNA and generate mutations. UV radiation is one of the most common mutagens and is estimated to introduce a significant number of changes in DNA. These include bends or kinks in the structure, which can block DNA replication or transcription. If these errors are not fixed, the damage can cause mutations, which in turn can result in cancer or disease depending on which sequences are...
DNA Bacteriophages
Bacteriophages, or phages, are viruses that specifically infect bacteria, utilizing their genetic material to hijack host cellular machinery for replication. DNA bacteriophages employ single-stranded DNA (ssDNA) or double-stranded DNA (dsDNA) genomes. These phages exhibit diverse replication strategies and host interactions, influencing their ecological roles and applications in biotechnology and medicine.ssDNA BacteriophagesssDNA phages, with their small genomes, utilize unique strategies to...

