{"rfam": {"acc": "RF00050", "id": "FMN", "description": "FMN riboswitch aptamer (RFN element)", "comment": "The RFN element is a highly conserved domain that is found frequently in the 5'-untranslated regions of prokaryotic mRNAs that encode for flavin mononucleotide (FMN) biosynthesis and transport proteins. This element is a metabolite-dependent riboswitch that directly binds FMN in the absence of proteins. In Bacillus subtilis, the riboswitch most likely controls gene expression by causing premature transcription termination within the 5' untranslated region of the ribDEAHT operon and precluding access to the ribosome-binding site of ypaA mRNA [3].The FMN riboswitch structure, reported in [4] present an FMN-bound six-stem junction, adopts a butterfly-like scaffold, stapled together by opposingly directed but nearly identically folded peripheral domains. The FMN riboswitch structure was reported in PDB: 3F2Q, 3F2T, 3F2W, 3F2X, 3F2Y, 3F30 [4] 6WJR, 6WJS [5]", "curation": {"author": "Vitreshchak A, Gelfand M, Bateman A, Ontiveros-Palacios N", "seed_source": "Vitreshchak A", "num_seed": 146, "num_full": 6230, "num_species": 5120, "type": "Cis-reg; riboswitch;", "structure_source": "Published; PMID:12456892"}, "cm": {"build_command": "cmbuild -F CM SEED", "calibrate_command": "cmcalibrate --mpi CM", "search_command": "cmsearch --cpu 4 --verbose --nohmmonly -T 30.00 -Z 2958934 CM SEQDB", "cutoffs": {"gathering": 66.2, "trusted": 66.2, "noise": 66.1}}, "release": {"date": "2026-01-16", "number": "15.1"}, "clan": {"acc": null, "id": null}}}