Britannica AI Icon

Quick Summary

A capsomere is a protein subunit that makes up the protein shell, or capsid, of a virus. The capsid surrounds the virus's genetic material, which is either RNA or DNA. These capsomeres typically associate with the virion's nucleic acid.12

Viruses are classified based on their protein capsid structure. Some viruses have a helical rod-like structure, like the tobacco mosaic virus, while others form symmetrical polygons, often icosahedral in shape. The number and arrangement of capsomeres are used in classifying these virus families.12

Summary created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.
2 Britannica Sources
  1. virus - The protein capsid
  2. virion

Ask Britannica AI about this topic

Britannica doesn't have a full article on this topic, so we've curated a list of our relevant coverage.