Related Experiment Video
Updated: May 10, 2026

09:08
Generation and Assembly of Virus-Specific Nucleocapsids of the Respiratory Syncytial Virus
Published on: July 27, 2021
Structure and assembly of complex viruses.
1Department of Macromolecular Structure, Centro Nacional de Biotecnología (CSIC), c/Darwin 3, Campus de Cantoblanco, 28049, Madrid, Spain, carmen@cnb.csic.es.
Sub-Cellular Biochemistry
|June 6, 2013
Summary
Complex viruses feature diverse capsid components beyond simple protein arrangements, requiring sophisticated mechanisms for their assembly and morphogenesis. Understanding these structures is key to viral biology.
Area of Science:
- Virology
- Structural Biology
- Biochemistry
Background:
- Viral particles possess a protein capsid protecting the genome.
- Simple viruses have capsids made of few protein types organized symmetrically.
- Complex viruses exhibit greater structural diversity and assembly challenges.
Purpose of the Study:
- To provide an overview of the structure of complex viruses.
- To elucidate the assembly mechanisms of complex viruses.
- To highlight the diversity in complex viral particle composition and geometry.
Main Methods:
- Review of existing literature on viral structure and assembly.
- Analysis of structural data for various complex viruses.
- Comparative analysis of simple versus complex viral architectures.
Main Results:
- Complex viral capsids incorporate accessory proteins and non-proteic elements like lipids.
- These viruses display a wide range of geometrical variability, from near-icosahedral to asymmetric and pleomorphic.
- Complex viruses necessitate advanced regulatory mechanisms for morphogenesis due to their intricate composition.
Conclusions:
- The assembly of complex viruses is a sophisticated process requiring precise regulation.
- Structural complexity in viruses correlates with diverse components and assembly strategies.
- Further research into complex viral morphogenesis can reveal novel biological principles.
Related Concept Videos
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 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...
Many viruses self-assemble into a fully functional unit using the infected host cell to...
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...
Many viruses self-assemble into a fully functional unit using the infected host cell to...
Introduction to Virus
Viruses are unique biological entities that blur the boundary between living and non-living systems. Although they lack cellular structure and metabolic processes, they can exhibit characteristics of life when infecting a host. Their defining feature is a nucleic acid core, composed of either DNA or RNA, encapsulated within a protein coat called a capsid. This simple structure allows them to invade host cells and use their machinery for replication efficiently.Viral Structure and...
What are Viruses?
Overview
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...

