All NSPs have their own specific functions such as suppression of host gene expression by NSP1 and NSP2, formation of a multidomain complex by NSP3, NSP5 which is a M protease which has role in replication,[17] NSP4 and NSP6 which are transmembrane (TM) proteins,[18] NSP7 and NSP8 which act as a primase,[16] NSP9 – a RNA-binding protein, the dimeric form of which is important for viral infection.