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bacterial Hfq-like Hfq, an abundant, ubiquitous RNA-binding protein, functions as a pleiotropic regulator of RNA metabolism in prokaryotes, required for transcription of some transcripts and degradation of others. Hfq binds small RNA molecules called riboregulators that modulate the stability or translation efficiency of RNA transcripts. Hfq binds preferentially to unstructured A/U-rich RNA sequences and is similar to the eukaryotic Sm proteins in both sequence and structure. Hfq forms a homo-hexameric ring similar to the heptameric ring of the Sm proteins.
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Jiyao W et al.(2023). "The conserved domain database in 2023.",