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Videos de Conceptos Relacionados

Viral Structure00:56

Viral Structure

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.
Protein Complex Assembly02:41

Protein Complex Assembly

Proteins can form homomeric complexes with another unit of the same protein or heteromeric complexes with different types.  Most protein complexes self-assemble spontaneously via ordered pathways, while some proteins need assembly factors that guide their proper assembly. Despite the crowded intracellular environment, proteins usually interact with their correct partners and form functional complexes.
Many viruses self-assemble into a fully functional unit using the infected host cell to...
The Nucleosome Core Particle01:12

The Nucleosome Core Particle

Nucleosomes are the DNA-histone complex, where the DNA strand is wound around the histone core. The histone core is an octamer containing two copies of H2A, H2B, H3, and H4 histone proteins.
Nucleosomes, paradoxically, perform two opposite functions simultaneously. On the one hand, their primary aim is to protect the delicate DNA strands from physical damage and help achieve a higher compaction ratio. On the other hand, they must allow polymerase enzymes to access histone-bound DNA during...
Size and Structure of Viral Genomes01:26

Size and Structure of Viral Genomes

Viral genomes exhibit remarkable diversity in size, structure, and composition, influencing their replication strategies and interactions with host cells. These genomes consist of either DNA or RNA and may be linear or circular. Additionally, they can be single-stranded or double-stranded, with each configuration affecting how the virus propagates within a host. RNA viruses, for instance, generally have smaller genomes than DNA viruses, a factor that contributes to their high mutation rates and...
Subviral Agents01:29

Subviral Agents

Subviral agents are infectious entities that resemble viruses but lack one or more viral components, such as a capsid or essential replication machinery. These agents include viroids, prions, and satellites, each possessing distinct structural and functional characteristics that influence their mode of infection and replication.Viroids are the simplest subviral agents, consisting of circular, single-stranded RNA molecules without a protein coat. They exclusively infect plants, relying entirely...
Coronavirus01:29

Coronavirus

Coronaviruses, including the severe acute respiratory syndrome coronavirus (SARS-CoV), are enveloped viruses characterized by their single-stranded, positive-sense RNA genome and helical nucleocapsid structure. The hallmark of these viruses is their club-shaped spike (S) glycoproteins that protrude from the viral envelope, facilitating attachment to host cells. Typically, coronaviruses infect the upper respiratory tract, often causing mild or asymptomatic disease. However, certain strains like...

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Video Experimental Relacionado

Updated: Jul 14, 2026

Averaging of Viral Envelope Glycoprotein Spikes from Electron Cryotomography Reconstructions using Jsubtomo
08:29

Averaging of Viral Envelope Glycoprotein Spikes from Electron Cryotomography Reconstructions using Jsubtomo

Published on: October 21, 2014

La estructura de la cápside del virus del polioma tiene una resolución de 22,5 A.

I Rayment, T S Baker, D L Caspar

    Nature
    |January 14, 1982
    PubMed
    Resumen

    El análisis estructural de los cristales de cápside de polioma reveló un hallazgo inesperado: la unidad morfológica hexavalente es un pentámero. Esto sugiere que la especificidad de unión de las subunidades de proteínas no se conserva en la estructura icosaédrica de la cápside.

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    Área de la Ciencia:

    • Biología estructural Biología estructural.
    • Virología Virología.
    • La bioquímica es la bioquímica.

    Sus antecedentes:

    • Las cápsidas del virus del polioma son capas de proteínas icosaédricas cruciales para la infección viral.
    • Comprender la estructura de la cápside es clave para desarrollar estrategias antivirales.
    • Los modelos anteriores asumieron bonos conservados entre las subunidades de capsid.

    Objetivo del estudio:

    • Para determinar la estructura tridimensional precisa de las cápsidas del virus del polioma.
    • Para investigar las interacciones de enlace entre las subunidades de proteínas dentro de la cápside.
    • Para aclarar la simetría y la disposición de las subunidades de la cápside del polioma.

    Principales métodos:

    • Recopilación de datos de difracción de rayos X de los cristales de cápsidos de polioma.
    • Modelos de inicio de baja resolución refinados para obtener información de fase.
    • Obtuvo una solución estructural autoconsistente a través del refinamiento iterativo.

    Principales resultados:

    • Los datos de difracción de rayos X arrojaron una solución estructural de alta resolución.
    • Un hallazgo clave fue la identificación de la unidad morfológica hexavalente como un pentámero.
    • Esta disposición desafía las suposiciones anteriores sobre las interacciones de las subunidades.

    Conclusiones:

    • La cápside del polioma exhibe una disposición pentamérica inesperada dentro de sus unidades morfológicas hexavalentes.
    • Este hallazgo estructural indica una falta de especificidad de unión conservada entre las subunidades de proteínas.
    • La simetría icosaédrica de la cápside se mantiene a pesar de esta unión no conservada.