Table 1.

Catalytic constants for CO₂ hydration by wild-type human CA isozymes II, IV, and XII

Isozyme	kcat, μs−1	kcat/Km, μM−1⋅s−1
CA II*	1.4	150
CA IV†	1.1	51
CA XII‡	0.4	34

^*Ref. 59. 

^†Ref. 60. 

^‡Ref. 18.