the enzyme was inhibited competitively by bestatin ( ki 10-7 m ) and by captopril ( 2.5.10-7 m , d-3-thio-2-methylpropanyl proline ) and by low concentrations of zn2+ or pcmb , and at higher concentrations by tpck and pmsf .
C0006938
captopril
C0033382
proline