1.S.1.1.7
ComK1 of 111 aas, possibly with one N-terminal TMS.  It is one of four Carboxysome shell proteins called ComK1 - 4, all of which are homologous to each other (Kerfeld et al. 2005). The structures of other proteins in the carboxysome have been solved structurally.  These include CsoSCA (formerly CsoS3), a bacterial carbonic anhydrase localized in the shell of the carboxysome, where it converts HCO₃^- to CO₂ for use in carbon fixation by ribulose-bisphosphate carboxylase/oxygenase (RuBisCO) (Sawaya et al. 2006). The carboxysome contains a viral capsid-like protein shell (see above) (Yeates et al. 2007) and a RuBisCO chaperone protein, RbcX (Tanaka et al. 2007).  Atomic-level models of the bacterial carboxysome shell have been proposed (Tanaka et al. 2008). Molecular simulations have unraveled the molecular principles that mediate selective permeability of carboxysome shell proteins (Faulkner et al. 2020).