Cytoplasmic RING-finger type E3 ubiquitin ligase; involved in monoubiquitination of Rps3p, a 40S subunit from decoding-defective ribosomes, leading to Fap1p-mediated K63-linked polyubiquitination, followed by dissociation of non-functional 80S ribosomes and non-functional rRNA decay (NRD) of 18S rRNA; ubiquitinated; induced in response to mycotoxin patulin; predicted to be involved in repair of alkylated DNA due to interaction with MAG1; similar to the human ring finger motif protein RNF10