ID   RTCA_SACS2              Reviewed;         337 AA.
AC   Q97W04;
DT   27-MAY-2002, integrated into UniProtKB/Swiss-Prot.
DT   27-MAY-2002, sequence version 2.
DT   03-AUG-2022, entry version 108.
DE   RecName: Full=RNA 3'-terminal phosphate cyclase;
DE            Short=RNA cyclase;
DE            Short=RNA-3'-phosphate cyclase;
DE            EC=6.5.1.4;
GN   Name=rtcA; OrderedLocusNames=SSO2446;
OS   Saccharolobus solfataricus (strain ATCC 35092 / DSM 1617 / JCM 11322 / P2)
OS   (Sulfolobus solfataricus).
OC   Archaea; Crenarchaeota; Thermoprotei; Sulfolobales; Sulfolobaceae;
OC   Saccharolobus.
OX   NCBI_TaxID=273057;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=ATCC 35092 / DSM 1617 / JCM 11322 / P2;
RX   PubMed=11427726; DOI=10.1073/pnas.141222098;
RA   She Q., Singh R.K., Confalonieri F., Zivanovic Y., Allard G., Awayez M.J.,
RA   Chan-Weiher C.C.-Y., Clausen I.G., Curtis B.A., De Moors A., Erauso G.,
RA   Fletcher C., Gordon P.M.K., Heikamp-de Jong I., Jeffries A.C., Kozera C.J.,
RA   Medina N., Peng X., Thi-Ngoc H.P., Redder P., Schenk M.E., Theriault C.,
RA   Tolstrup N., Charlebois R.L., Doolittle W.F., Duguet M., Gaasterland T.,
RA   Garrett R.A., Ragan M.A., Sensen C.W., Van der Oost J.;
RT   "The complete genome of the crenarchaeon Sulfolobus solfataricus P2.";
RL   Proc. Natl. Acad. Sci. U.S.A. 98:7835-7840(2001).
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 (By similarity). {ECO:0000250}.
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   -!- SUBCELLULAR LOCATION: Cytoplasm {ECO:0000305}.
CC   -!- SIMILARITY: Belongs to the RNA 3'-terminal cyclase family. Type 1
CC       subfamily. {ECO:0000305}.
CC   -!- SEQUENCE CAUTION:
CC       Sequence=AAK42586.1; Type=Erroneous initiation; Evidence={ECO:0000305};
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DR   EMBL; AE006641; AAK42586.1; ALT_INIT; Genomic_DNA.
DR   PIR; C90416; C90416.
DR   RefSeq; WP_009993131.1; NC_002754.1.
DR   AlphaFoldDB; Q97W04; -.
DR   SMR; Q97W04; -.
DR   STRING; 273057.SSO2446; -.
DR   EnsemblBacteria; AAK42586; AAK42586; SSO2446.
DR   GeneID; 44128164; -.
DR   KEGG; sso:SSO2446; -.
DR   PATRIC; fig|273057.12.peg.2524; -.
DR   eggNOG; arCOG04125; Archaea.
DR   HOGENOM; CLU_027882_0_0_2; -.
DR   InParanoid; Q97W04; -.
DR   OMA; PKPGLSH; -.
DR   PhylomeDB; Q97W04; -.
DR   Proteomes; UP000001974; 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; IBA:GO_Central.
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; SSF55205; SSF55205; 1.
DR   TIGRFAMs; TIGR03399; RNA_3prim_cycl; 1.
DR   PROSITE; PS01287; RTC; 1.
PE   3: Inferred from homology;
KW   ATP-binding; Cytoplasm; Ligase; Nucleotide-binding; Reference proteome.
FT   CHAIN           1..337
FT                   /note="RNA 3'-terminal phosphate cyclase"
FT                   /id="PRO_0000156436"
FT   ACT_SITE        306
FT                   /note="Tele-AMP-histidine intermediate"
FT                   /evidence="ECO:0000250"
FT   BINDING         101
FT                   /ligand="ATP"
FT                   /ligand_id="ChEBI:CHEBI:30616"
FT                   /evidence="ECO:0000250"
FT   BINDING         282..285
FT                   /ligand="ATP"
FT                   /ligand_id="ChEBI:CHEBI:30616"
FT                   /evidence="ECO:0000250"
SQ   SEQUENCE   337 AA;  36845 MW;  53E7FD006751D9B0 CRC64;
     MIEIDGSFGE GGGQILRTSL TLSVITGKPF RIFNIRANRP NPGLQRQHLW AVRAMKMISN
     AETKGDEVGS KELTFIPHEI KGNSIIDIDI GTAGSVTLIM QTMIPAIINK NMRIKIKGGT
     DVPKSPTIDY IRLVYLEILR KIGIESKVNL IKRGHYPEGG GEVIIENVNG NPSDFSLLEL
     GKLIMIKGIS HVSSLPSHIA ERQKDSAKAI LSKLGVQIEI ETDVRQGEVS KGSGIALAAI
     GEKSIIGADS LGERGKRAEI VGEEAARKLI DNLNTKAAVD VHMSDMLMIF TSLFGGEYIG
     AELTSHAYTN MEIIRKFLDV KIEISGKRPF RFKAKIF