the staphylococcal protease was coupled at the active-site serine residue with a spin-labeled analog of diisopropyl fluorophosphonate and the interaction of competitive inhibitors such as chloride and acetate anions , as well as n-carbobenzoxy-l-glutamic acid ( z-l-glu ) , was investigated by electron paramagnetic resonance spectroscopy .
C0008203
chloride
C0003075
anions