Despite the fact that there are no directstudies of this protein in SARS infections, PSMB7 is important forcapsid assembly of some viruses.50 Thus,the interaction between PSMB7 and the viral capsid for Grass carpreovirus protein suggests that PSMB7-mediated interference with proteasomeassembly should be involved in effective virus infection. This evidence concerns the gene PSMB7 and viral infectious disease.