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Secondary CO2 binding site in holo-hCA II: (A) 0 s (yellow) and (B) 50 s (green). The 2Fo-Fc (blue) and Fo-Fc (green) electron density maps are contoured at 1.2σ and 3.0σ, respectively. The 2Fo-Fc map for CO2 is highlighted in pink for clarity. (C) Superposition of (A) 0 s (yellow) onto (B) 50 s (green). Note the change of conformation of the Phe226 side chain on CO2 release.
