alexa Structure of virus

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Structure of virus

A virus is a small infectious agent that replicates inside the living cells of other organisms. The simplest virions consists to two basic components such as nucleic acid and a protein coat called the capsid, it acts as a shell to protect the viral genome from nucleases . The capsid is made from proteins encoded by the viral genome and its shape serves as the basis for morphological distinction. Proteins associated with nucleic acid are known as nucleoproteins, and the association of viral capsid proteins with viral nucleic acid is called a nucleocapsid, Viruses are classified on the basis of morphology, chemical composition, and mode of replication. There are four main morphological virus types helical, icosahedral, prolate, envelope, complex. Virus capsids follows two basic patterns helical symmetry, in which the protein subunits and the nucleic acid are arranged in a helix, and icosahedral symmetry, in which the protein subunits assemble into a symmetric shell that covers the nucleic acid-containing core.

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