ID   RTCA_HYPBU              Reviewed;         359 AA.
AC   A2BN21;
DT   18-MAR-2008, integrated into UniProtKB/Swiss-Prot.
DT   20-FEB-2007, sequence version 1.
DT   27-MAR-2024, entry version 87.
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=Hbut_1561;
OS   Hyperthermus butylicus (strain DSM 5456 / JCM 9403 / PLM1-5).
OC   Archaea; Thermoproteota; Thermoprotei; Desulfurococcales; Pyrodictiaceae;
OC   Hyperthermus.
OX   NCBI_TaxID=415426;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=DSM 5456 / JCM 9403 / PLM1-5;
RX   PubMed=17350933; DOI=10.1155/2007/745987;
RA   Bruegger K., Chen L., Stark M., Zibat A., Redder P., Ruepp A., Awayez M.,
RA   She Q., Garrett R.A., Klenk H.-P.;
RT   "The genome of Hyperthermus butylicus: a sulfur-reducing, peptide
RT   fermenting, neutrophilic Crenarchaeote growing up to 108 degrees C.";
RL   Archaea 2:127-135(2007).
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; CP000493; ABM81382.1; -; Genomic_DNA.
DR   RefSeq; WP_011822700.1; NC_008818.1.
DR   AlphaFoldDB; A2BN21; -.
DR   SMR; A2BN21; -.
DR   STRING; 415426.Hbut_1561; -.
DR   EnsemblBacteria; ABM81382; ABM81382; Hbut_1561.
DR   GeneID; 4781412; -.
DR   KEGG; hbu:Hbut_1561; -.
DR   eggNOG; arCOG04125; Archaea.
DR   HOGENOM; CLU_027882_0_0_2; -.
DR   OrthoDB; 7994at2157; -.
DR   Proteomes; UP000002593; Chromosome.
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   CDD; cd00874; RNA_Cyclase_Class_II; 1.
DR   Gene3D; 3.65.10.20; RNA 3'-terminal phosphate cyclase domain; 1.
DR   Gene3D; 3.30.360.20; RNA 3'-terminal phosphate cyclase, insert domain; 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   NCBIfam; TIGR03399; RNA_3prim_cycl; 1.
DR   PANTHER; PTHR11096; RNA 3' TERMINAL PHOSPHATE CYCLASE; 1.
DR   PANTHER; PTHR11096:SF0; RNA 3'-TERMINAL PHOSPHATE CYCLASE; 1.
DR   Pfam; PF01137; RTC; 1.
DR   Pfam; PF05189; RTC_insert; 1.
DR   PIRSF; PIRSF005378; RNA3'_term_phos_cycl_euk; 1.
DR   SUPFAM; SSF55205; EPT/RTPC-like; 1.
DR   PROSITE; PS01287; RTC; 1.
PE   3: Inferred from homology;
KW   ATP-binding; Cytoplasm; Ligase; Nucleotide-binding; Reference proteome.
FT   CHAIN           1..359
FT                   /note="RNA 3'-terminal phosphate cyclase"
FT                   /id="PRO_0000325189"
FT   ACT_SITE        317
FT                   /note="Tele-AMP-histidine intermediate"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00200"
FT   BINDING         100
FT                   /ligand="ATP"
FT                   /ligand_id="ChEBI:CHEBI:30616"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00200"
FT   BINDING         291..294
FT                   /ligand="ATP"
FT                   /ligand_id="ChEBI:CHEBI:30616"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00200"
SQ   SEQUENCE   359 AA;  38709 MW;  3E819662376B17DB CRC64;
     MIVIDGSIGE GGGQILRTTL ALAALLGKPV RIVNIRAKRP RPGLQRQHLT SVKAVAELAS
     ARVEGLELGS TTLVFIPRGL RSGRFYFNIG TAGSITLVLQ ALLPVTAFAP GPVEVEIVGG
     TDVPWSPPID YVRFVLRKLL AMFGFEFEII VKRRGHYPRG GGRVVLRVTQ PPHVLKPVKL
     EERGKVLRVE GLSHAVRLPR HVAERQARSA EAVLRSKLPG VPISIDLEWY EPSRDPHLGP
     GSGVVVWAVA EHSVLGSDSL GAKGKPAEAV GREAAEKLLE DLATGTALDR HASDMLIPYA
     ALACGESILG GARLTMHAWT NIEVVKMLVP GAEMEFIEGG KLNEKFKLRV KGICYKPSS
//