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Carboxysome Shell Carbonic Anhydrase is a bacterial carbonicanhydrase localised in the carboxysome, where it converts bicarbonate ions to carbon dioxide for use in carbon fixation. It contains three domains, these being: (1) an N-terminal domain composed primarily of four alpha-helices; (2) a catalytic domain containing a tightly bound zinc ion and (3) a C-terminal domain with weak structural similarity to the catalytic domain [1].
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