question: Which are the main NMD factors in Saccharomyces cerevisiae?
answer: Nonsense-mediated mRNA decay (NMD) is a surveillance mechanism that accelerates the degradation of mRNAs containing premature translation termination codons. This quality control pathway depends on the NMD-specific factors, Upf1p, Upf2p/Nmd2p, and Upf3p, as well as the two release factors, eRF1 and eRF3 (respectively designated Sup45p and Sup35p in yeast). NMD activation is also enabled by the absence of the poly(A)-binding protein, Pab1p, downstream of a termination event