carbonic anhydrase III is limited in rate by a step occuring outside the actual interconversion of CO2 and HCO3- and involving a change in bonding to hydrogen exchangeable with solvent water
reaction mechanism, model of the active site designed on the basis of the X-ray crystal structure, proposed for both metal ions similar reaction pathways consisting in the nucleophilic attack by the metal bound hydroxide to the carbon dioxide with bicarbonate formation, in a next internal rotation of this last fragment, and then in the formation of a species ready for the product removal, overview
reaction mechanism, model of the active site designed on the basis of the X-ray crystal structure, proposed for both metal ions similar reaction pathways consisting in the nucleophilic attack by the metal bound hydroxide to the carbon dioxide with bicarbonate formation, in a next internal rotation of this last fragment, and then in the formation of a species ready for the product removal, overview
interconversion of CO2 and water to bicarbonate and a proton. The general catalysis of CA is a metal-hydroxide ping-pong mechanism composed of two independent steps. The first step of catalysis is initiated by nucleophilic attack on the carbon of CO2 by the metal-bound hydroxide to yield bicarbonate, which is subsequently displaced by a water molecule. The second step is the removal of a proton from the now metal-bound water via an ordered water network and a residue acting as a weak base, which is typically a His at the opening of the active site
the catalytic mechanism for the CO2 hydration reaction consists of two steps. In the first step a zinc-bound hydroxide leads the nucleophilic attack on a CO2 molecule with formation of bicarbonate bound to the zinc ion, which is then substituted by a water molecule. The second step, the rate limiting one, consists of the regeneration of the enzyme reactive species, the zinc-bound hydroxide, via a proton transfer reaction, which occurs from the zinc-bound water molecule to the external buffer. This process is generally assisted by an enzyme residue which acts as proton shuttle
the catalytic mechanism for the CO2 hydration reaction consists of two steps. In the first step a zinc-bound hydroxide leads the nucleophilic attack on a CO2 molecule with formation of bicarbonate bound to the zinc ion, which is then substituted by a water molecule. The second step, the rate limiting one, consists of the regeneration of the enzyme reactive species, the zinc-bound hydroxide, via a proton transfer reaction, which occurs from the zinc-bound water molecule to the external buffer. This process is generally assisted by an enzyme residue which acts as proton shuttle
the catalytic mechanism for the CO2 hydration reaction consists of two steps. In the first step a zinc-bound hydroxide leads the nucleophilic attack on a CO2 molecule with formation of bicarbonate bound to the zinc ion, which is then substituted by a water molecule. The second step, the rate limiting one, consists of the regeneration of the enzyme reactive species, the zinc-bound hydroxide, via a proton transfer reaction, which occurs from the zinc-bound water molecule to the external buffer. This process is generally assisted by an enzyme residue which acts as proton shuttle
the catalytic mechanism for the CO2 hydration reaction consists of two steps. In the first step a zinc-bound hydroxide leads the nucleophilic attack on a CO2 molecule with formation of bicarbonate bound to the zinc ion, which is then substituted by a water molecule. The second step, the rate limiting one, consists of the regeneration of the enzyme reactive species, the zinc-bound hydroxide, via a proton transfer reaction, which occurs from the zinc-bound water molecule to the external buffer. This process is generally assisted by an enzyme residue which acts as proton shuttle
the catalytic mechanism for the CO2 hydration reaction consists of two steps. In the first step a zinc-bound hydroxide leads the nucleophilic attack on a CO2 molecule with formation of bicarbonate bound to the zinc ion, which is then substituted by a water molecule. The second step, the rate limiting one, consists of the regeneration of the enzyme reactive species, the zinc-bound hydroxide, via a proton transfer reaction, which occurs from the zinc-bound water molecule to the external buffer. This process is generally assisted by an enzyme residue which acts as proton shuttle
the catalytic mechanism for the CO2 hydration reaction consists of two steps. In the first step a zinc-bound hydroxide leads the nucleophilic attack on a CO2 molecule with formation of bicarbonate bound to the zinc ion, which is then substituted by a water molecule. The second step, the rate limiting one, consists of the regeneration of the enzyme reactive species, the zinc-bound hydroxide, via a proton transfer reaction, which occurs from the zinc-bound water molecule to the external buffer. This process is generally assisted by an enzyme residue which acts as proton shuttle
the catalytic mechanism for the CO2 hydration reaction consists of two steps. In the first step a zinc-bound hydroxide leads the nucleophilic attack on a CO2 molecule with formation of bicarbonate bound to the zinc ion, which is then substituted by a water molecule. The second step, the rate limiting one, consists of the regeneration of the enzyme reactive species, the zinc-bound hydroxide, via a proton transfer reaction, which occurs from the zinc-bound water molecule to the external buffer. This process is generally assisted by an enzyme residue which acts as proton shuttle
the catalytic mechanism for the CO2 hydration reaction consists of two steps. In the first step a zinc-bound hydroxide leads the nucleophilic attack on a CO2 molecule with formation of bicarbonate bound to the zinc ion, which is then substituted by a water molecule. The second step, the rate limiting one, consists of the regeneration of the enzyme reactive species, the zinc-bound hydroxide, via a proton transfer reaction, which occurs from the zinc-bound water molecule to the external buffer. This process is generally assisted by an enzyme residue which acts as proton shuttle
the catalytic mechanism for the CO2 hydration reaction consists of two steps. In the first step a zinc-bound hydroxide leads the nucleophilic attack on a CO2 molecule with formation of bicarbonate bound to the zinc ion, which is then substituted by a water molecule. The second step, the rate limiting one, consists of the regeneration of the enzyme reactive species, the zinc-bound hydroxide, via a proton transfer reaction, which occurs from the zinc-bound water molecule to the external buffer. This process is generally assisted by an enzyme residue which acts as proton shuttle
the catalytic mechanism for the CO2 hydration reaction consists of two steps. In the first step a zinc-bound hydroxide leads the nucleophilic attack on a CO2 molecule with formation of bicarbonate bound to the zinc ion, which is then substituted by a water molecule. The second step, the rate limiting one, consists of the regeneration of the enzyme reactive species, the zinc-bound hydroxide, via a proton transfer reaction, which occurs from the zinc-bound water molecule to the external buffer. This process is generally assisted by an enzyme residue which acts as proton shuttle
the catalytic mechanism for the CO2 hydration reaction consists of two steps. In the first step a zinc-bound hydroxide leads the nucleophilic attack on a CO2 molecule with formation of bicarbonate bound to the zinc ion, which is then substituted by a water molecule. The second step, the rate limiting one, consists of the regeneration of the enzyme reactive species, the zinc-bound hydroxide, via a proton transfer reaction, which occurs from the zinc-bound water molecule to the external buffer. This process is generally assisted by an enzyme residue which acts as proton shuttle
the catalytic mechanism for the CO2 hydration reaction consists of two steps. In the first step a zinc-bound hydroxide leads the nucleophilic attack on a CO2 molecule with formation of bicarbonate bound to the zinc ion, which is then substituted by a water molecule. The second step, the rate limiting one, consists of the regeneration of the enzyme reactive species, the zinc-bound hydroxide, via a proton transfer reaction, which occurs from the zinc-bound water molecule to the external buffer. This process is generally assisted by an enzyme residue which acts as proton shuttle
the catalytic mechanism for the CO2 hydration reaction consists of two steps. In the first step a zinc-bound hydroxide leads the nucleophilic attack on a CO2 molecule with formation of bicarbonate bound to the zinc ion, which is then substituted by a water molecule. The second step, the rate limiting one, consists of the regeneration of the enzyme reactive species, the zinc-bound hydroxide, via a proton transfer reaction, which occurs from the zinc-bound water molecule to the external buffer. This process is generally assisted by an enzyme residue which acts as proton shuttle
the catalytic mechanism for the CO2 hydration reaction consists of two steps. In the first step a zinc-bound hydroxide leads the nucleophilic attack on a CO2 molecule with formation of bicarbonate bound to the zinc ion, which is then substituted by a water molecule. The second step, the rate limiting one, consists of the regeneration of the enzyme reactive species, the zinc-bound hydroxide, via a proton transfer reaction, which occurs from the zinc-bound water molecule to the external buffer. This process is generally assisted by an enzyme residue which acts as proton shuttle
the catalytic mechanism for the CO2 hydration reaction consists of two steps. In the first step a zinc-bound hydroxide leads the nucleophilic attack on a CO2 molecule with formation of bicarbonate bound to the zinc ion, which is then substituted by a water molecule. The second step, the rate limiting one, consists of the regeneration of the enzyme reactive species, the zinc-bound hydroxide, via a proton transfer reaction, which occurs from the zinc-bound water molecule to the external buffer. This process is generally assisted by an enzyme residue which acts as proton shuttle
interconversion of CO2 and water to bicarbonate and a proton. The general catalysis of CA is a metal-hydroxide ping-pong mechanism composed of two independent steps. The first step of catalysis is initiated by nucleophilic attack on the carbon of CO2 by the metal-bound hydroxide to yield bicarbonate, which is subsequently displaced by a water molecule. The second step is the removal of a proton from the now metal-bound water via an ordered water network and a residue acting as a weak base, which is typically a His at the opening of the active site
the catalytic mechanism for the CO2 hydration reaction consists of two steps. In the first step a zinc-bound hydroxide leads the nucleophilic attack on a CO2 molecule with formation of bicarbonate bound to the zinc ion, which is then substituted by a water molecule. The second step, the rate limiting one, consists of the regeneration of the enzyme reactive species, the zinc-bound hydroxide, via a proton transfer reaction, which occurs from the zinc-bound water molecule to the external buffer. This process is generally assisted by an enzyme residue which acts as proton shuttle
the catalytic mechanism for the CO2 hydration reaction consists of two steps. In the first step a zinc-bound hydroxide leads the nucleophilic attack on a CO2 molecule with formation of bicarbonate bound to the zinc ion, which is then substituted by a water molecule. The second step, the rate limiting one, consists of the regeneration of the enzyme reactive species, the zinc-bound hydroxide, via a proton transfer reaction, which occurs from the zinc-bound water molecule to the external buffer. This process is generally assisted by an enzyme residue which acts as proton shuttle
the catalytic mechanism for the CO2 hydration reaction consists of two steps. In the first step a zinc-bound hydroxide leads the nucleophilic attack on a CO2 molecule with formation of bicarbonate bound to the zinc ion, which is then substituted by a water molecule. The second step, the rate limiting one, consists of the regeneration of the enzyme reactive species, the zinc-bound hydroxide, via a proton transfer reaction, which occurs from the zinc-bound water molecule to the external buffer. This process is generally assisted by an enzyme residue which acts as proton shuttle