Video Experimental Relacionado
Updated: Oct 2, 2025
06:10
Following Cell-fate in E. coli After Infection by Phage Lambda
Published on: October 14, 2011
23.6K
La toxina bacteriana colibactina desencadena la inducción de la propagación
Justin E Silpe1, Joel W H Wong1, Siân V Owen2
1Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA, USA.
Nature
|February 24, 2022
Resumen
La colibactina, una genotoxina de las bacterias intestinales, desencadena brotes de fagos en otros microbios al activar la respuesta SOS. El ADN exógeno o una proteína de resistencia (ClbS) pueden prevenir este efecto.
Área de la Ciencia:
- Microbiología
- Biología molecular
- La genómica
Sus antecedentes:
- La colibactina es una genotoxina producida por bacterias intestinales, con efectos conocidos en los sistemas de los mamíferos.
- Su impacto en otros microorganismos, particularmente dentro del microbioma, sigue sin caracterizarse en gran medida.
Objetivo del estudio:
- Investigar los efectos de la colibactina en las comunidades microbianas.
- Aclarar el mecanismo por el cual la colibactina influye en las poblaciones bacterianas y la actividad de los prófagos.
Principales métodos:
- Exposición de los sistemas bacterianos a la colibactina.
- Investigando el papel de la respuesta SOS bacteriana en los efectos de la colibactina.
- Evaluación de los efectos protectores del ADN exógeno y la proteína ClbS.
- Análisis de la resistencia a la colibactina y los genes biosintéticos en varias especies bacterianas.
Principales resultados:
- Colibactin se dirige a las bacterias que contienen prófagos, induciendo el desarrollo lítico a través de la respuesta SOS.
- El ADN exógeno y la proteína de resistencia a la colibactina (ClbS) confieren protección contra la colibactina.
- Estos efectos de inducción de las fagas se observan en diversos sistemas de bacterias fagas y comunidades complejas.
- Las bacterias con genes de resistencia pero que carecen de genes biosintéticos están protegidas por los homólogos de ClbS de la expresión de prófagos inducida por la colibactina.
Conclusiones:
- La producción de colibactina influye en la dinámica del microbioma al desencadenar brotes de prófagos.
- Los productos naturales microbianos como la colibactina pueden mediar eventos a nivel de población, incluida la diseminación de fagos.
- La proteína ClbS proporciona un mecanismo para que las bacterias resistan los efectos de propagación de la colibactina.
Más Videos Relacionados
Videos de Conceptos Relacionados
00:43Lysogenic Cycle of Bacteriophages
63.8K
In contrast to the lytic cycle, phages infecting bacteria via the lysogenic cycle do not immediately kill their host cell. Instead, they combine their genome with the host genome, allowing the bacteria to replicate the phage DNA along with the bacterial genome. The incorporated copy of the phage genome is called the prophage. Some prophages can re-activate and enter the lytic cycle. This often occurs in response to a perturbation, such as DNA damage, but can also transpire in the absence of...
63.8K
01:16Viral Replication: Lysogenic Cycle
348
The lysogenic cycle is a crucial viral replication strategy that allows bacteriophages to persist within host cells without immediately destroying them. This process is primarily observed in temperate phages, such as bacteriophage lambda (λ), which infects Escherichia coli. The cycle allows the viral genome to persist across bacterial generations while keeping host cells viable.Integration of the Viral GenomeUpon infection, bacteriophage lambda attaches to the bacterial surface and injects...
348
01:20Viral Replication: Lytic Cycle
358
Bacteriophages, or phages, are viruses that specifically infect bacteria. Among them, T-even bacteriophages, such as T4, exhibit a well-characterized lytic replication cycle in Escherichia coli (E. coli). This process ensures the rapid proliferation of the virus while ultimately leading to the destruction of the bacterial host.Attachment and DNA InjectionThe infection process begins with the recognition and binding of the T4 phage to the E. coli cell surface. Tail fibers of the phage...
358
01:26DNA Bacteriophages
203
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...
203
01:16Transduction
240
Among the three main modes of HGT—transformation, conjugation, and transduction—transduction is unique in that it is mediated by bacteriophages, or bacterial viruses.Transduction occurs in two ways. Generalized transduction occurs during the lytic cycle of a bacteriophage infection. In this process, bacteriophages infect bacterial cells, replicate within them, and ultimately cause cell lysis, releasing newly assembled virions. Occasionally, random fragments of the bacterial genome...
240
01:30Lytic Cycle of Bacteriophages
72.6K
Bacteriophages, also known as phages, are specialized viruses that infect bacteria. A key characteristic of phages is their distinctive “head-tail” morphology. A phage begins the infection process (i.e., lytic cycle) by attaching to the outside of a bacterial cell. Attachment is accomplished via proteins in the phage tail that bind to specific receptor proteins on the outer surface of the bacterium. The tail injects the phage’s DNA genome into the bacterial cytoplasm. In the...
72.6K