Porcine reproductive and respiratory syndrome virus membrane protein (PRRSV M protein)

The Porcine reproductive and respiratory syndrome virus (PRRSV) membrane protein (M protein) is a vital non-glycosylated structural protein encoded by the ORF6 gene (UniProt P0C6Y6). It is the most conserved structural protein among PRRSV isolates, making it a key target for diagnostic and therapeutic development. The M protein's primary biological function is to facilitate virus assembly and budding by forming a disulfide-linked heterodimer with the major envelope glycoprotein GP5 (PubMed: 10666358). This M-GP5 complex is essential for viral infectivity and serves as a major target for the host's neutralizing antibody response (PubMed: 16103210). Additionally, the M protein is involved in modulating host cellular processes, such as inducing apoptosis and antagonizing the type I interferon response to facilitate immune evasion (PubMed: 29203304). In the context of disease, PRRSV causes significant economic losses in the swine industry through reproductive failure and respiratory distress, with the M protein being a critical component of the infectious virion. Therapeutic interventions targeting the M protein include modified live and inactivated vaccines, as well as experimental approaches like siRNA and small molecules designed to disrupt viral assembly (PubMed: 25446350). Despite its conservation, the high mutation rate of the PRRSV genome and the potential for recombination remain significant challenges for developing universal vaccines targeting this protein (PubMed: 31434287).

Other names

Matrix proteinMembrane proteinM proteinORF6 protein

Inhibition of viral assembly and budding by disrupting the formation of the M-GP5 heterodimer or blocking viral entry into host cells.