Catalyzes the conversion of carbon disulfide into hydrogen sulfide and carbon dioxide, with carbonyl sulfide as an intermediate. Likely plays a key role in sulfur metabolism that allows A.thiooxidans G8 to grow on carbon disulfide as the main carbon and energy source. Does not show carbonic anhydrase activity (hydration of CO(2) to carbonate). carbon disulfide + 2 H2O = CO2 + 2 H(+) + 2 hydrogen sulfide Binds 1 zinc ion per subunit. kcat is 3000 sec(-1) with carbon disulfide as substrate. kcat is 22400 sec(-1) with the intermediate carbonyl sulfide as substrate. Sulfur metabolism; hydrogen sulfide biosynthesis. Exists as both octamers and hexadecamers in solution. The hexadecameric homooligomer may form a catenane, through interactions of two interlocked octameric rings. Belongs to the beta-class carbonic anhydrase family.