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Related Concept Videos

Viral Structure00:56

Viral Structure

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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.
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Protein Complex Assembly02:41

Protein Complex Assembly

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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...
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Leaky Scanning02:28

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During most eukaryotic translation processes, the small 40S ribosome subunit scans an mRNA from its 5' end until it encounters the first start AUG codon. The large 60S ribosomal subunit then joins the smaller one to initiate protein synthesis. The location of the translation initiation is largely determined by the nucleotides near the start codon as there may be multiple translation initiation sites present on the mRNA.  Marilyn Kozak discovered that the sequence RCCAUGG (where R...
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Coat Assembly and GTPases01:33

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Vesicles incorporate different coat protein subunits in different cell locations, which changes the properties of the coat, such as the shape and geometry of the transport vesicles. Thus, vesicle coat proteins also play a significant role in cargo selection.
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What are Viruses?00:50

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Overview
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Intralumenal Vesicles and Multivesicular Bodies01:38

Intralumenal Vesicles and Multivesicular Bodies

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Intraluminal vesicles (ILVs) are small vesicles 50-80 nm in diameter formed during the maturation of early endosomes. A specialized endosome containing numerous ILVs is called a multivesicular body (MVB). ILVs contain internalized molecules such as antigens, nucleic acids, proteins, and metabolites. Some of these molecules are released from the MVBs inside exosomes and are transported to other cells. Other MVBs contain molecules that are retained in the ILVs and are later degraded within the...
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Updated: May 23, 2025

Modeling The Lifecycle Of Ebola Virus Under Biosafety Level 2 Conditions With Virus-like Particles Containing Tetracistronic Minigenomes
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Structural basis for Ebola virus nucleocapsid assembly and function regulated by VP24.

Yoko Fujita-Fujiharu1,2,3,4, Shangfan Hu1,2,3, Ai Hirabayashi1,3

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The Ebola virus nucleocapsid structure was revealed using cryo-electron microscopy. Specific interactions involving nucleoprotein (NP) and VP24 proteins regulate viral assembly and replication, offering new antiviral targets.

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Area of Science:

  • Virology
  • Structural Biology
  • Molecular Biology

Background:

  • Ebola virus causes severe hemorrhagic fever and belongs to the Filoviridae family.
  • The virus has a filamentous structure with a helical nucleocapsid essential for its lifecycle.
  • The precise structure and function of the nucleocapsid, including interactions between nucleoprotein (NP) and VP24, were not fully understood.

Purpose of the Study:

  • To determine the high-resolution structure of the Ebola virus nucleocapsid.
  • To elucidate the specific interactions between NP and VP24 proteins within the nucleocapsid.
  • To understand how these interactions regulate viral functions.

Main Methods:

  • Single-particle cryo-electron microscopy (cryo-EM) was used to determine the nucleocapsid-like structure at 4.6 Å resolution.
  • Virus-like particles were utilized for structural analysis.
  • Mutational analysis was performed to investigate protein interactions and their functional consequences.

Main Results:

  • The study determined the nucleocapsid-like structure within virus-like particles at 4.6 Å resolution.
  • Specific interactions between nucleoprotein (NP) and VP24 were identified.
  • Mutational analysis revealed that VP24, in distinct orientations, differentially regulates nucleocapsid assembly, RNA synthesis, intracellular transport, and virion production.

Conclusions:

  • The detailed structure of the Ebola virus nucleocapsid and the roles of NP-VP24 interactions are now clearer.
  • VP24 plays a critical, multifaceted role in regulating key stages of the viral lifecycle.
  • These findings provide crucial insights into the sophisticated mechanisms of nucleocapsid assembly and function, informing the development of novel antiviral strategies.