the specificity studies indicate that the enzyme is a `` '' post-proline cleaving enzyme '' '' which hydrolyzes peptides of the general structure , yaa-pro-xaa , in which xaa = amino acid , peptide , or amide ( not pro ) , and yaa = n-blocked basic amino acid or a peptide sequence in which the c-terminal residue ( i.e . the residue prior to pro ) is a basic amino acid such as his , lys , or arg .
C0301714
a basic amino ac
C0024337
, l