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Ribosomal silencing factor during starvation This family is expressed by almost all bacterial and eukaryotic genomes but not by archaea. Its function is to down-regulate protein synthesis under conditions of nutrient shortage, and it does this by binding to protein L14 of the large ribosomal subunit, thus acting as a ribosomal silencing factor (RsfS) by blocking the joining of the ribosomal subunits. This family is structurally homologous to nucleotidyltransferases.
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Lu S et al.(2020). "CDD/SPARCLE: the conserved domain database in 2020.",