Smg8 and Smg9 are two subunits of the Smg-1 complex. They suppress Smg-1 kinase activity in the isolated Smg-1 complex, and are involved in nonsense-mediated mRNA decay (NMD) in both mammals and nematodes [1].

1: SMG-8 and SMG-9, two novel subunits of the SMG-1 complex, regulate remodeling of the mRNA surveillance complex during nonsense-mediated mRNA decay. Yamashita A, Izumi N, Kashima I, Ohnishi T, Saari B, Katsuhata Y, Muramatsu R, Morita T, Iwamatsu A, Hachiya T, Kurata R, Hirano H, Anderson P, Ohno S; Genes Dev. 2009;23:1091-1105. PMID:19417104