Certain rare enzymes ,
They are so efficient that almost every time enzyme meets its substrate, the reaction occurs.
E + S ➡️ ES Complex ➡️ Instantaneously Product formed
For such enzymes this becomes the rate limiting step & is only determined by
Rate of Diffusion of molecules in solution.
Means , Catalytically perfect reactions are only limited by substrate diffusion rate.( Substrate diffusion into active site )
This enzymes are called Diffusion limited/ Catalytically perfect enzymes.
Catalytic efficiency reaches the diffusion limit.
Examples =
Furiously trying to CAtCh ( think Ball) diffusion limit in Superover.
Fumarase
Triose phosphate isomerase
Catalase
Cytochrome C peroxidase
CAH ( Carbonic anhydrase )
AchE ( Ach esterase )
Ball = Beta lactamase
Superover = SOD = Superoxide Dismutase
Thank you...
By Drashtant
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