Part of the ribosome quality control system (RQC). Recruits Ala-charged tRNA and directs the elongation of stalled nascent chains on 50S ribosomal subunits, leading to non-templated C-terminal Ala extensions (Ala tail). The Ala tail promotes nascent chain degradation. May add between 1 and at least 8 Ala residues. Binds to stalled 50S ribosomal subunits. Plays a role in bacterial binding to eukaryotic host fibronectin and other extracellular matrix proteins (Probable). Wild-type cells inhibit binding of S.aureus, L.monocytogenes and E.faecalis to human fibronectin in vitro, bacteria with a deletion of this gene no longer do so (PubMed:28294433). Associates with stalled 50S ribosomal subunits. Expressed during exponential growth, decreases in stationary phase. Transcription is down-regulated by AbrB and DegU in logarithmic and stationary phase respectively. Bacteria no longer adhere to fibronectin or collagen, decreased biofilm formation. Bacteria no longer inhibit binding of other bacteria to fibronectin. Belongs to the NEMF family.