Protein involved in removal of stalled, decoding-defective ribosomes; acts as cofactor for Fap1p, along with Fpr1p, increasing the efficiency of Rps3p polyubiquitination on stalled monosomes and the subsequent decay of nonfunctional 18S rRNA; green fluorescent protein (GFP)-fusion protein localizes to the cytoplasm; mRNA is enriched in Scp160p-associated mRNPs; non-essential gene