– Cysteine protease that plays an essential role in host liquefaction to facilitate horizontal transmission of the virus. Accumulates within infected cells as an inactive proenzyme (proV-CATH), which is activated by proteolytic cleavage upon cell death. AcMNPV Viral cathepsin Protein (His & SUMO) is expressed in E. coli expression system with N-6xHis-SUMO tag. The predicted molecular weight is 39.9 kDa and the accession number is P25783.