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. Author manuscript; available in PMC: 2021 Apr 29.
Published in final edited form as: Annu Rev Plant Biol. 2020 Mar 9;71:461–485. doi: 10.1146/annurev-arplant-081519-040100

Figure 2.

Figure 2

HCO3− transport in a β-cyanobacterial cell starts at the plasma membrane, where the transporters BicA, SbtA, and BCT1 are located. After being concentrated in the cytoplasm, HCO3− diffuses into the carboxysome, likely via pores in the shell protein CcmK4. Inside the carboxysome, carbonic anhydrases convert HCO3− into CO2, which can then be fixed by Rubisco clustered there. CO2 that diffuses into the cytoplasm or leaks out of the carboxysome is converted to HCO3− by the NDH-13 and NDH-14 complexes.