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 significant role in virulence (PubMed:11580843). Recombinant protein binds to immobilized human fibronectin; binding is saturable and competed by heparin. Purified protein inhibits binding of whole cells to fibronectin (By similarity). Associates with stalled 50S ribosomal subunits (By similarity). Interacts with human fibronectin (By similarity). Found on the cell surface in the region of the capsule in capsulated bacteria (NCTC 10319 and R36A). About 50% reduction of binding to immobilized human fibronectin, greatly reduced mortality in mice (tested with encapsulated strain D39). Belongs to the NEMF family.