T=27/pseudo27 icosahedral capsid


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The capsid is composed 60 asymmetric units made of 27 proteins (T=27), for a total of 1620 capsid proteins.

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Icosahedric triangulation number is calculated following Caspar and Klug system


Sputnik virus capsid symmetry is a pseudo T=27 structure, because hexamers are formed by 3 subunits instead of 6.

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
PhiKZ-like virus
Sputnik virus