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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.