T=21 icosahedral capsid


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The capsid is composed 60 asymmetric units made of 21 proteins (T=21), for a total of 1260 capsid proteins. These capsids are skewed, and are therefore described as either right- (dextro) or left- (laevo) handed.



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Icosahedric triangulation number is calculated following Caspar and Klug system


Corticoviridae capsid symmetry is a pseudo T=21 structure, because hexamers are formed by 3 subunits instead of 6.

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Viral molecular biology Virion
Virus entry
Virus latency
Transcription and replication
Host-virus interactions
Virus exit
Icosahedric capsids Virus symmetry and T number
T=1
T=2*
T=3
Pseudo T=3
T=4
T=7
T=9
T=13
T=16
T=21/pseudo T=21
T=25/pseudo T=25
T=27/pseudo T=27
T=28
T=31/pseudo T=31
T=75 bacterial carboxysome
T=169
Links Uniprot Keyword:
GO ontology:
Virus dsDNA
Corticoviridae