the inhibition in vitro was rapid ( 5 mm beta-cl-alanine caused complete inactivation in 10 min ) , irreversible , and concentration and time dependent and apparently involved the active site because inactivation only occurred with beta-cl-l-alanine ( not beta-cl-d-alanine ) and was blocked by l-serine .
C0000392
beta
C0001898
alanine