La estructura y las propiedades físicas de una partícula bacteriófago envasada
These videos have been matched automatically. Contact us if they are not relevant.
These videos have been matched automatically. Contact us if they are not relevant.
Ver abstracta en PubMed
Resumen
Este resumen es generado por máquina.Los investigadores crearon un modelo atómico detallado de un virus, revelando cómo está empaquetado su ADN. Este mecanismo de envasado de ADN influye en cada partícula del virus
Área De La Ciencia
- Biología estructural
- Biología computacional
- Virología
Sus Antecedentes
- Los cápsidos virales están bien estudiados, pero la organización 3D de su material genético sigue siendo en gran medida desconocida.
- Comprender el empaque del genoma viral es crucial para comprender el ensamblaje y la función del virus.
Objetivo Del Estudio
- Generar modelos estructurales de todos los átomos de un virión completo, incluido su genoma.
- Para aclarar el mecanismo de envasado del ADN viral y su impacto en la estructura del virión.
Principales Métodos
- Se emplearon simulaciones de multiresolución para modelar el virión HK97 y su genoma.
- Las simulaciones imitaron el empaque del genoma y refinaron la estructura de la cápside a un nivel de todos los átomos (26 millones de átomos).
- Las simulaciones de microsegundos analizaron la presión interna, la electrostática y la dinámica de difusión.
Principales Resultados
- Se generó con éxito un modelo atómico completo del virión HK97, que abarca su genoma de ADN.
- El empaquetado de ADN a través de la extrusión en bucle crea configuraciones genómicas únicas, impartiendo rasgos individuales a las partículas virales.
- El genoma empacado influye en la estructura de la cápside, el entorno interno y revela huellas estructurales en el ADN.
Conclusiones
- El estudio presenta un enfoque computacional generalizado para modelar viriones completos.
- Esta metodología puede descubrir nuevos objetivos farmacológicos en la interfaz genoma-cápsida para varias especies de virus.
Estos videos han sido emparejados automáticamente Contact us si no son relevantes
Estos videos han sido emparejados automáticamente Contact us si no son relevantes
Videos de Conceptos Relacionados
Viruses are extraordinarily diverse in shape and size, but they all have several structural features in common. All viruses have a core that contains a DNA- or RNA-based genome. The core is surrounded by a protective coat of proteins called the capsid. The capsid is composed of subunits called capsomeres. The capsid and genome-containing core are together known as the nucleocapsid.
Structural Classes of Viruses
Many criteria are used to classify viruses, including capsid design. Most viruses...
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...
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...
Overview
A virus is a microscopic infectious particle that consists of an RNA or DNA genome enclosed in a protein shell. It is not able to reproduce on its own: it can only make more viruses by entering a cell and using its cellular machinery. When a virus infects a host cell, it removes its protein coat and directs the host’s machinery to transcribe and translate its genetic material. The hijacked cell assembles the replicated components into thousands of viral progeny, which can...
Intracellular bacteria and viruses often comprise a group of highly infectious pathogens that can cause several diseases. Bacterial pathogens include those belonging to the genus Rickettsia responsible for conditions such as rocky mountain spotted fever and the Mediterranean spotted fever; Chlamydia, a genus responsible for a sexually transmitted disease; Coxiella burnetii, an agent responsible for Q fever. Viral pathogens include vaccinia—a poxvirus, and herpes simplex virus—a...
Prokaryotes are small unicellular organisms that include the domains—Archaea and Bacteria. Bacteria include many common organisms, such as Salmonella and E. coli, while the Archaea include extremophiles that live in harsh environments, such as volcanic springs.
Like eukaryotic cells, all prokaryotic cells are surrounded by a plasma membrane, have genetic material in the form of single, circular DNA, a cytoplasm that fills the interior of the cell, and ribosomes that synthesize proteins....