Table 1

Designation, chromosomal location, and primary substrate specificities of major human and murine MC proteases

Protein designationGene nameChromosomal locationPrimary substrate specificity*
Chymase (human) CMA1 14q11.2 Chymotrypsin-like (aromatic amino acid) 
mMCP-1 Mcpt1 14C1/2 Chymotrypsin-like (aromatic amino acid) 
mMCP-2 Mcpt2 14C1/2 Unknown (low enzymatic activity) 
mMCP-4 Mcpt4 14C1/2 Chymotrypsin-like (aromatic amino acid) 
mMCP-5 Cma1/Mcpt5 14C1/2 Elastase-like (Val/Ala/Ile) 
MC-CPA (human) CPA3 3q24 CPA-like (aromatic amino acid); exopeptidase 
MC-CPA (mouse) Cpa3 3A3 CPA-like (aromatic amino acid); exopeptidase 
Tryptase βII/βIII (human) TPSAB1 16p13.3 Trypsin-like (Arg/Lys) 
Tryptase αI/βI (human) TPSA1 16p13.3 Trypsin-like (Arg/Lys) 
mMCP-6 Mcpt6 17A3.3 Trypsin-like (Arg/Lys) 
mMCP-7 Tpsab1 17A3.3 Trypsin-like (Arg/Lys) 
Protein designationGene nameChromosomal locationPrimary substrate specificity*
Chymase (human) CMA1 14q11.2 Chymotrypsin-like (aromatic amino acid) 
mMCP-1 Mcpt1 14C1/2 Chymotrypsin-like (aromatic amino acid) 
mMCP-2 Mcpt2 14C1/2 Unknown (low enzymatic activity) 
mMCP-4 Mcpt4 14C1/2 Chymotrypsin-like (aromatic amino acid) 
mMCP-5 Cma1/Mcpt5 14C1/2 Elastase-like (Val/Ala/Ile) 
MC-CPA (human) CPA3 3q24 CPA-like (aromatic amino acid); exopeptidase 
MC-CPA (mouse) Cpa3 3A3 CPA-like (aromatic amino acid); exopeptidase 
Tryptase βII/βIII (human) TPSAB1 16p13.3 Trypsin-like (Arg/Lys) 
Tryptase αI/βI (human) TPSA1 16p13.3 Trypsin-like (Arg/Lys) 
mMCP-6 Mcpt6 17A3.3 Trypsin-like (Arg/Lys) 
mMCP-7 Tpsab1 17A3.3 Trypsin-like (Arg/Lys) 

MC indicates mast cell; mMCP, mouse mast cell protease; and CPA, carboxypeptidase A.

*

Refers to the preferred amino acid residue N-terminal of the cleavage site (P1 position).

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