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. Recombinant protein binds to immobilized human fibronectin; binding is saturable and competed by heparin. Recombinant protein inhibits binding of whole cells to fibronectin. Associates with stalled 50S ribosomal subunits (By similarity). Interacts with human fibronectin (PubMed:11580843). Found on the cell surface in the region of the capsule in capsulated bacteria (strains 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. This strain is avirulent; testing for virulence is done in strain D39. Extended N-terminus.