substrate specificity

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sub·strate spec·i·fic·i·ty

the ability of an enzyme to recognize and bind its substrates, typically measured by the Vmax/Km or kcat/Km ratios.

substrate

any substance upon which an enzyme acts.

substrate binding site
part of the active site of an enzyme which includes the amino acid residues that come into contact with the substrate.
substrate specificity
range of substrates that can be catalytically converted to product by an enzyme.
suicide substrate