ID   ENDA_SULIL              Reviewed;         182 AA.
AC   C3MQX7;
DT   22-SEP-2009, integrated into UniProtKB/Swiss-Prot.
DT   16-JUN-2009, sequence version 1.
DT   03-AUG-2022, entry version 65.
DE   RecName: Full=tRNA-splicing endonuclease {ECO:0000255|HAMAP-Rule:MF_01833};
DE            EC=4.6.1.16 {ECO:0000255|HAMAP-Rule:MF_01833};
DE   AltName: Full=tRNA-intron endonuclease {ECO:0000255|HAMAP-Rule:MF_01833};
GN   Name=endA {ECO:0000255|HAMAP-Rule:MF_01833}; OrderedLocusNames=LS215_1794;
OS   Sulfolobus islandicus (strain L.S.2.15 / Lassen #1).
OC   Archaea; Crenarchaeota; Thermoprotei; Sulfolobales; Sulfolobaceae;
OC   Sulfolobus.
OX   NCBI_TaxID=429572;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=L.S.2.15 / Lassen #1;
RX   PubMed=19435847; DOI=10.1073/pnas.0808945106;
RA   Reno M.L., Held N.L., Fields C.J., Burke P.V., Whitaker R.J.;
RT   "Biogeography of the Sulfolobus islandicus pan-genome.";
RL   Proc. Natl. Acad. Sci. U.S.A. 106:8605-8610(2009).
CC   -!- FUNCTION: Endonuclease that removes tRNA introns. Cleaves pre-tRNA at
CC       the 5'- and 3'-splice sites to release the intron. The products are an
CC       intron and two tRNA half-molecules bearing 2',3' cyclic phosphate and
CC       5'-OH termini. Recognizes a pseudosymmetric substrate in which 2 bulged
CC       loops of 3 bases are separated by a stem of 4 bp. {ECO:0000255|HAMAP-
CC       Rule:MF_01833}.
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=pretRNA = a 3'-half-tRNA molecule with a 5'-OH end + a 5'-
CC         half-tRNA molecule with a 2',3'-cyclic phosphate end + an intron with
CC         a 2',3'-cyclic phosphate and a 5'-hydroxyl terminus.; EC=4.6.1.16;
CC         Evidence={ECO:0000255|HAMAP-Rule:MF_01833};
CC   -!- SUBUNIT: Homotetramer; although the tetramer contains four active
CC       sites, only two participate in the cleavage. Therefore, it should be
CC       considered as a dimer of dimers. {ECO:0000255|HAMAP-Rule:MF_01833}.
CC   -!- SIMILARITY: Belongs to the tRNA-intron endonuclease family. Archaeal
CC       short subfamily. {ECO:0000255|HAMAP-Rule:MF_01833}.
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DR   EMBL; CP001399; ACP35790.1; -; Genomic_DNA.
DR   RefSeq; WP_012713899.1; NC_012589.1.
DR   AlphaFoldDB; C3MQX7; -.
DR   SMR; C3MQX7; -.
DR   EnsemblBacteria; ACP35790; ACP35790; LS215_1794.
DR   GeneID; 7807471; -.
DR   GeneID; 8761758; -.
DR   KEGG; sis:LS215_1794; -.
DR   HOGENOM; CLU_114393_0_0_2; -.
DR   OMA; KGPGIDH; -.
DR   OrthoDB; 98477at2157; -.
DR   Proteomes; UP000001747; Chromosome.
DR   GO; GO:0016829; F:lyase activity; IEA:UniProtKB-KW.
DR   GO; GO:0003676; F:nucleic acid binding; IEA:InterPro.
DR   GO; GO:0000213; F:tRNA-intron endonuclease activity; IEA:UniProtKB-UniRule.
DR   GO; GO:0006388; P:tRNA splicing, via endonucleolytic cleavage and ligation; IEA:UniProtKB-UniRule.
DR   Gene3D; 3.40.1350.10; -; 1.
DR   HAMAP; MF_01833; EndA_short; 1.
DR   InterPro; IPR011856; tRNA_endonuc-like_dom_sf.
DR   InterPro; IPR036167; tRNA_intron_Endo_cat-like_sf.
DR   InterPro; IPR006677; tRNA_intron_Endonuc_cat-like.
DR   InterPro; IPR006678; tRNA_intron_Endonuc_N.
DR   InterPro; IPR036740; tRNA_intron_Endonuc_N_sf.
DR   InterPro; IPR006676; tRNA_splic.
DR   InterPro; IPR016442; tRNA_splic_arch_short.
DR   PANTHER; PTHR21227; PTHR21227; 1.
DR   Pfam; PF01974; tRNA_int_endo; 1.
DR   Pfam; PF02778; tRNA_int_endo_N; 1.
DR   PIRSF; PIRSF005285; tRNA_splic_archaea; 1.
DR   SUPFAM; SSF53032; SSF53032; 1.
DR   SUPFAM; SSF55267; SSF55267; 1.
DR   TIGRFAMs; TIGR00324; endA; 1.
PE   3: Inferred from homology;
KW   Lyase; tRNA processing.
FT   CHAIN           1..182
FT                   /note="tRNA-splicing endonuclease"
FT                   /id="PRO_1000216081"
FT   ACT_SITE        119
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01833"
FT   ACT_SITE        127
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01833"
FT   ACT_SITE        158
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01833"
SQ   SEQUENCE   182 AA;  20856 MW;  4CF4A96A4C640DC5 CRC64;
     MVKALLVGSK VLIPNVDESR YIYSNGFYGK AIGISKPKDP KDIIRPLELS LIESVYLAKK
     GLIKVIDKNG EVLEYEKLYE YSSKIINKFD IMYRVYEDLR EKGFIVRSGV KYGADFAVYT
     LGPGLEHAPY VVIAVDIDEE ITPHELLSFG RVSHSTRKRL VLALVDRKSE SVRYIMFKWV
     KM