Fig. 1
From: Ultra-thin enzymatic liquid membrane for CO2 separation and capture
Carbonic anhydrase enzyme and its CO2 capture and regeneration mechanism. a Ribbon representation of the carbonic anhydrase (CA) enzyme. b Active site of CA determined by molecular simulations (vide infra). A zinc ion (Zn2+) surrounded by three coordinating histidines and a water molecule comprises the active site. c Depiction of the overall catalytic cycle for CO2 hydration to HCO3– with zinc as the metal in the CA active site. This reaction is driven by a concentration gradient: clockwise when the CO2 concentration is greater than HCO3– and counterclockwise when more HCO3– is present. Deprotonation of the zinc-bound water is thought to be rate limiting
