[The actions of low-molecular fragments of substrate and their analogs on the activity of isoenzymes of phospholipase C from Clostridium perfringens].

The interaction of the lecithin molecule fragments and their analogues with phospholipase C Cl. perfringens was studied by gel-diffusion in agarose-lecithin gels. It was found intense inhibition of phospholipase C activity in the presence of cathionic compounds; this phenomenon shows the existence of anionic centre in the active site of enzyme. The esteric centre is probably hydrophobic nature and is not capable to bind the negatively charged groups. However, phosphoserine, phosphothreonine, gamma-aminobutyric, aspartic and glutamic acids can interact with an additional cathionic centre, whose location in phospholipase C differs from that in pancreatic phospholipase A2.