Nonsense-mediated mRNA decay (NMD) is a surveillance mechanism that detects and degrades mRNAs containing premature translation termination codons. Protein SMG9 is a component of the SMG1C protein kinase complex (along with SMG1 and SMG8) which is recruited to stalled ribosomes. SMG8 and SMG9 suppress SMG1 kinase activity in the isolated SMG1 complex [].
SMG8 is involved in nonsense-mediated decay (NMD) of mRNAs containing premature stop codons. In humans, it is a component of the SMG1C complex composed of SMG1, SMG8 and SMG9 []. SMG-8 can recruit SMG-1 to the mRNA surveillance complex and can regulate the kinase activity of SMG-1 [].
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 []. NMD is a surveillance mechanism that detects and degrades mRNAs containing premature translation termination codons.
