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Carboxysome Shell 1 (CsoS1); Bacterial Micro-Compartment (BMC) domain The cso operon in Halothiobacillus neapolitanus contains the genes involved in alpha carboxysome function including those for the carboxysome shell proteins: CsoS1A, CsoS1B, and CsoS1C. CsoS1A has been shown to form hexameric units which further assemble into the flat facets of the polyhedral carboxysome shell. The structures suggest that the central pores and the gaps between hexamers limit the transport of metabolites into and out of the the carboxysome. Although it has been suggested that other homologous proteins, CsoS1B and CsoS1C, in this family might also form hexamers and play similar functional roles in the construction of carboxysome outer shell at present no experimental evidence directly supports this view.
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Jiyao W et al.(2023). "The conserved domain database in 2023.",