Bacterial microcompartment - Wikipedia
https://en.wikipedia.org/wiki/Bacterial_microcompartment
OverviewEvolution of BMCs and relation to viral capsidsDiscoveryShellsThe BMC shell protein familyPermeability of the shellTypesAssemblyWhile the BMC shell is architecturally similar to many viral capsids, the shell proteins have not been found to have any structural or sequence homology to capsid proteins. Instead, structural and sequence comparisons suggest that both BMC-H (and BMC-T) and BMC-P, most likely, have evolved from bona fide cellular proteins, namely, PII signaling protein and OB-fold domain-containing protein, respectively.
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