explain the catalytic triad.
histidine: usually found near the surface because of hydrophilic properties; but, in here, it is in the active site helping with the reaction
serine: gives proton to histidine, which loses it
These three (ser, his, asp) might be responsible for cleavage of the peptide bond. Histidine can help because it is pos or neg. His starts out as neutral and goes positive. Because a positive charge can be harmful, aspartate is balancing it out with a negative charge.