ID   RTCA_ECO5E              Reviewed;         342 AA.
AC   B5YTX2;
DT   24-MAR-2009, integrated into UniProtKB/Swiss-Prot.
DT   25-NOV-2008, sequence version 1.
DT   03-AUG-2022, entry version 78.
DE   RecName: Full=RNA 3'-terminal phosphate cyclase {ECO:0000255|HAMAP-Rule:MF_00200};
DE            Short=RNA cyclase {ECO:0000255|HAMAP-Rule:MF_00200};
DE            Short=RNA-3'-phosphate cyclase {ECO:0000255|HAMAP-Rule:MF_00200};
DE            EC=6.5.1.4 {ECO:0000255|HAMAP-Rule:MF_00200};
GN   Name=rtcA {ECO:0000255|HAMAP-Rule:MF_00200};
GN   OrderedLocusNames=ECH74115_4728;
OS   Escherichia coli O157:H7 (strain EC4115 / EHEC).
OC   Bacteria; Proteobacteria; Gammaproteobacteria; Enterobacterales;
OC   Enterobacteriaceae; Escherichia.
OX   NCBI_TaxID=444450;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=EC4115 / EHEC;
RX   PubMed=22135463; DOI=10.1073/pnas.1107176108;
RA   Eppinger M., Mammel M.K., Leclerc J.E., Ravel J., Cebula T.A.;
RT   "Genomic anatomy of Escherichia coli O157:H7 outbreaks.";
RL   Proc. Natl. Acad. Sci. U.S.A. 108:20142-20147(2011).
CC   -!- FUNCTION: Catalyzes the conversion of 3'-phosphate to a 2',3'-cyclic
CC       phosphodiester at the end of RNA. The mechanism of action of the enzyme
CC       occurs in 3 steps: (A) adenylation of the enzyme by ATP; (B) transfer
CC       of adenylate to an RNA-N3'P to produce RNA-N3'PP5'A; (C) and attack of
CC       the adjacent 2'-hydroxyl on the 3'-phosphorus in the diester linkage to
CC       produce the cyclic end product. The biological role of this enzyme is
CC       unknown but it is likely to function in some aspects of cellular RNA
CC       processing. {ECO:0000255|HAMAP-Rule:MF_00200}.
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=a 3'-end 3'-phospho-ribonucleotide-RNA + ATP = a 3'-end 2',3'-
CC         cyclophospho-ribonucleotide-RNA + AMP + diphosphate;
CC         Xref=Rhea:RHEA:23976, Rhea:RHEA-COMP:10463, Rhea:RHEA-COMP:10464,
CC         ChEBI:CHEBI:30616, ChEBI:CHEBI:33019, ChEBI:CHEBI:83062,
CC         ChEBI:CHEBI:83064, ChEBI:CHEBI:456215; EC=6.5.1.4;
CC         Evidence={ECO:0000255|HAMAP-Rule:MF_00200};
CC   -!- SUBCELLULAR LOCATION: Cytoplasm {ECO:0000255|HAMAP-Rule:MF_00200}.
CC   -!- SIMILARITY: Belongs to the RNA 3'-terminal cyclase family. Type 1
CC       subfamily. {ECO:0000255|HAMAP-Rule:MF_00200}.
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DR   EMBL; CP001164; ACI38089.1; -; Genomic_DNA.
DR   RefSeq; WP_000827117.1; NC_011353.1.
DR   AlphaFoldDB; B5YTX2; -.
DR   SMR; B5YTX2; -.
DR   KEGG; ecf:ECH74115_4728; -.
DR   HOGENOM; CLU_027882_0_0_6; -.
DR   OMA; PKPGLSH; -.
DR   GO; GO:0005737; C:cytoplasm; IEA:UniProtKB-SubCell.
DR   GO; GO:0005524; F:ATP binding; IEA:UniProtKB-KW.
DR   GO; GO:0003963; F:RNA-3'-phosphate cyclase activity; IEA:UniProtKB-UniRule.
DR   GO; GO:0006396; P:RNA processing; IEA:InterPro.
DR   Gene3D; 3.30.360.20; -; 1.
DR   Gene3D; 3.65.10.20; -; 1.
DR   HAMAP; MF_00200; RTC; 1.
DR   InterPro; IPR013791; RNA3'-term_phos_cycl_insert.
DR   InterPro; IPR023797; RNA3'_phos_cyclase_dom.
DR   InterPro; IPR037136; RNA3'_phos_cyclase_dom_sf.
DR   InterPro; IPR000228; RNA3'_term_phos_cyc.
DR   InterPro; IPR017770; RNA3'_term_phos_cyc_type_1.
DR   InterPro; IPR020719; RNA3'_term_phos_cycl-like_CS.
DR   InterPro; IPR013792; RNA3'P_cycl/enolpyr_Trfase_a/b.
DR   InterPro; IPR036553; RPTC_insert.
DR   PANTHER; PTHR11096; PTHR11096; 1.
DR   PANTHER; PTHR11096:SF0; PTHR11096:SF0; 1.
DR   Pfam; PF01137; RTC; 1.
DR   Pfam; PF05189; RTC_insert; 1.
DR   PIRSF; PIRSF005378; RNA3'_term_phos_cycl_euk; 1.
DR   SUPFAM; SSF52913; SSF52913; 1.
DR   SUPFAM; SSF55205; SSF55205; 2.
DR   TIGRFAMs; TIGR03399; RNA_3prim_cycl; 1.
DR   PROSITE; PS01287; RTC; 1.
PE   3: Inferred from homology;
KW   ATP-binding; Cytoplasm; Ligase; Nucleotide-binding.
FT   CHAIN           1..342
FT                   /note="RNA 3'-terminal phosphate cyclase"
FT                   /id="PRO_1000099346"
FT   ACT_SITE        308
FT                   /note="Tele-AMP-histidine intermediate"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00200"
FT   BINDING         103
FT                   /ligand="ATP"
FT                   /ligand_id="ChEBI:CHEBI:30616"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00200"
FT   BINDING         283..287
FT                   /ligand="ATP"
FT                   /ligand_id="ChEBI:CHEBI:30616"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00200"
SQ   SEQUENCE   342 AA;  36332 MW;  783FE7FAD7160846 CRC64;
     MKRMIALDGA QGEGGGQIMR SALSLSMITG QPFTITGIRA GRAKPGLLRQ HLTAVKAATE
     ICGATVEGAE LGSQRLVFRP GTVRGGDYRF AIGSAGSCTL VLQTVLPALW FADGPSRVEV
     SGGTDNPSAP PADFIRRVLE PLLAKIGIHQ QTTLLRHGFY PAGGGVVATE VSPVASFNTL
     QLGERGNIVQ MRGEVLLAGV PRHVAEREIA TLAASFSLHE QNIHNLPRDQ GPGNTVSLEV
     ESENITERFF VVGEKRVSAE VVAAQLVKEV KRYLASPAAV GEYLADQLVL PMALAGAGQF
     TVAHPSCHLL TNIAVVERFL PVRFTLAETD GVTRVMITKL TD