– Structural protein involved in the envelopment of mature virion (MV) to form the wrapped virion (WV). The wrapping consists of the addition of Golgi membranes to the mature virion. Participates in mature virion (MV) movement within the infected cell. May play an indirect role in MV-cell fusion. Variola virus (isolate Human/India/Ind3/1967) OPG154 Protein (E. coli, His) is expressed in E. coli expression system with N-6xHis tag. The predicted molecular weight is 16.6 kDa and the accession number is P33816.