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Related Concept Videos

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.
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...
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...
Introduction to Virus01:28

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...
Viruses with RNA Genomes01:29

Viruses with RNA Genomes

RNA viruses are categorized into positive-strand, negative-strand, or double-stranded groups based on their genomic structure and replication mechanisms. This classification dictates how they exploit host cellular machinery for protein synthesis and replication. Some RNA viruses also utilize reverse transcription as part of their life cycle, further diversifying their replication strategies.Positive-Strand RNA VirusesPositive-strand RNA viruses have genomes that function directly as messenger...
What are Viruses?00:50

What are Viruses?

Overview

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Related Experiment Video

Updated: Jul 16, 2026

Purification of Viral DNA for the Identification of Associated Viral and Cellular Proteins
08:26

Purification of Viral DNA for the Identification of Associated Viral and Cellular Proteins

Published on: August 31, 2017

Distinctive features of large complex virus genomes and proteomes.

Jan Mrázek1, Samuel Karlin

  • 1Department of Microbiology and Institute of Bioinformatics, University of Georgia, Athens, GA 30602, USA.

Proceedings of the National Academy of Sciences of the United States of America
|March 16, 2007
PubMed
Summary

Giant viruses like mimivirus challenge our understanding of early life evolution. Their distinct genome signatures and proteome compositions suggest unique evolutionary paths and host interactions.

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Purification of Viral DNA for the Identification of Associated Viral and Cellular Proteins
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High-Resolution Complexome Profiling by Cryoslicing BN-MS Analysis

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Area of Science:

  • Virology
  • Evolutionary Biology
  • Genomics

Background:

  • Recent discovery of large DNA viruses, including mimivirus with a 1.2-Mb genome.
  • These findings prompt re-evaluation of early life evolution and evolutionary transitions.
  • Large viruses offer new models for studying genomic and proteomic diversity.

Purpose of the Study:

  • Analyze genome signatures and proteome composition of large viruses.
  • Investigate the evolutionary implications of viral genome characteristics.
  • Explore the functional significance of frequent oligonucleotides and peptides in viral genomes.

Main Methods:

  • Comparative analysis of viral and host genome signatures.
  • Analysis of amino acid usage patterns (e.g., Glu vs. Asp, Phe vs. Tyr) in viral proteomes.
  • Characterization of frequent oligonucleotides and peptides within large viral genomes.

Main Results:

  • Large viral genome signatures often differ from their hosts, suggesting lytic cycles.
  • Viral proteomes exhibit distinct amino acid preferences (e.g., Asp over Glu, Tyr over Phe) compared to cellular organisms.
  • Frequent oligonucleotides and peptides in viral genomes may facilitate host protein interactions.

Conclusions:

  • Large viruses possess unique genomic and proteomic features that distinguish them from cellular life.
  • These features provide insights into viral evolution, host-virus interactions, and potentially early life forms.
  • Further research into viral genome composition can illuminate evolutionary mechanisms and functional adaptations.