ID   SYT_LARHH               Reviewed;         633 AA.
AC   C1DDA6;
DT   28-JUL-2009, integrated into UniProtKB/Swiss-Prot.
DT   26-MAY-2009, sequence version 1.
DT   04-NOV-2026, entry version 89.
DE   RecName: Full=Threonine--tRNA ligase {ECO:0000255|HAMAP-Rule:MF_00184};
DE            EC=6.1.1.3 {ECO:0000255|HAMAP-Rule:MF_00184};
DE   AltName: Full=Threonyl-tRNA synthetase {ECO:0000255|HAMAP-Rule:MF_00184};
DE            Short=ThrRS {ECO:0000255|HAMAP-Rule:MF_00184};
GN   Name=thrS {ECO:0000255|HAMAP-Rule:MF_00184};
GN   OrderedLocusNames=LHK_02757;
OS   Laribacter hongkongensis (strain HLHK9).
OC   Bacteria; Pseudomonadati; Pseudomonadota; Betaproteobacteria; Neisseriales;
OC   Aquaspirillaceae; Laribacter.
OX   NCBI_TaxID=557598;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=HLHK9;
RX   PubMed=19283063; DOI=10.1371/journal.pgen.1000416;
RA   Woo P.C.Y., Lau S.K.P., Tse H., Teng J.L.L., Curreem S.O., Tsang A.K.L.,
RA   Fan R.Y.Y., Wong G.K.M., Huang Y., Loman N.J., Snyder L.A.S., Cai J.J.,
RA   Huang J.-D., Mak W., Pallen M.J., Lok S., Yuen K.-Y.;
RT   "The complete genome and proteome of Laribacter hongkongensis reveal
RT   potential mechanisms for adaptations to different temperatures and
RT   habitats.";
RL   PLoS Genet. 5:E1000416-E1000416(2009).
CC   -!- FUNCTION: Catalyzes the attachment of threonine to tRNA(Thr) in a two-
CC       step reaction: L-threonine is first activated by ATP to form Thr-AMP
CC       and then transferred to the acceptor end of tRNA(Thr). Also edits
CC       incorrectly charged L-seryl-tRNA(Thr). {ECO:0000255|HAMAP-
CC       Rule:MF_00184}.
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=tRNA(Thr) + L-threonine + ATP = L-threonyl-tRNA(Thr) + AMP +
CC         diphosphate + H(+); Xref=Rhea:RHEA:24624, Rhea:RHEA-COMP:9670,
CC         Rhea:RHEA-COMP:9704, ChEBI:CHEBI:15378, ChEBI:CHEBI:30616,
CC         ChEBI:CHEBI:33019, ChEBI:CHEBI:57926, ChEBI:CHEBI:78442,
CC         ChEBI:CHEBI:78534, ChEBI:CHEBI:456215; EC=6.1.1.3;
CC         Evidence={ECO:0000255|HAMAP-Rule:MF_00184};
CC   -!- COFACTOR:
CC       Name=Zn(2+); Xref=ChEBI:CHEBI:29105; Evidence={ECO:0000255|HAMAP-
CC         Rule:MF_00184};
CC       Note=Binds 1 zinc ion per subunit. {ECO:0000255|HAMAP-Rule:MF_00184};
CC   -!- SUBUNIT: Homodimer. {ECO:0000255|HAMAP-Rule:MF_00184}.
CC   -!- SUBCELLULAR LOCATION: Cytoplasm {ECO:0000255|HAMAP-Rule:MF_00184}.
CC   -!- SIMILARITY: Belongs to the class-II aminoacyl-tRNA synthetase family.
CC       {ECO:0000255|HAMAP-Rule:MF_00184}.
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DR   EMBL; CP001154; ACO75738.1; -; Genomic_DNA.
DR   RefSeq; WP_012698201.1; NC_012559.1.
DR   AlphaFoldDB; C1DDA6; -.
DR   SMR; C1DDA6; -.
DR   STRING; 557598.LHK_02757; -.
DR   KEGG; lhk:LHK_02757; -.
DR   eggNOG; COG0441; Bacteria.
DR   HOGENOM; CLU_008554_0_1_4; -.
DR   OMA; AACCVKI; -.
DR   Proteomes; UP000002010; Chromosome.
DR   GO; GO:0005737; C:cytoplasm; IEA:UniProtKB-SubCell.
DR   GO; GO:0005524; F:ATP binding; IEA:UniProtKB-UniRule.
DR   GO; GO:0004829; F:threonine-tRNA ligase activity; IEA:UniProtKB-UniRule.
DR   GO; GO:0006435; P:threonyl-tRNA aminoacylation; IEA:UniProtKB-UniRule.
DR   CDD; cd01667; TGS_ThrRS; 1.
DR   CDD; cd00860; ThrRS_anticodon; 1.
DR   CDD; cd00771; ThrRS_core; 1.
DR   FunFam; 3.10.20.30:FF:000005; Threonine--tRNA ligase; 1.
DR   FunFam; 3.30.930.10:FF:000002; Threonine--tRNA ligase; 1.
DR   FunFam; 3.40.50.800:FF:000001; Threonine--tRNA ligase; 1.
DR   FunFam; 3.30.980.10:FF:000005; Threonyl-tRNA synthetase, mitochondrial; 1.
DR   Gene3D; 3.10.20.30; -; 1.
DR   Gene3D; 3.30.54.20; -; 1.
DR   Gene3D; 3.40.50.800; Anticodon-binding domain; 1.
DR   Gene3D; 3.30.930.10; Bira Bifunctional Protein, Domain 2; 1.
DR   Gene3D; 3.30.980.10; Threonyl-trna Synthetase, Chain A, domain 2; 1.
DR   HAMAP; MF_00184; Thr_tRNA_synth; 1.
DR   InterPro; IPR002314; aa-tRNA-synt_IIb.
DR   InterPro; IPR006195; aa-tRNA-synth_II.
DR   InterPro; IPR045864; aa-tRNA-synth_II/BPL/LPL.
DR   InterPro; IPR004154; Anticodon-bd.
DR   InterPro; IPR036621; Anticodon-bd_dom_sf.
DR   InterPro; IPR012675; Beta-grasp_dom_sf.
DR   InterPro; IPR004095; TGS.
DR   InterPro; IPR012676; TGS-like.
DR   InterPro; IPR002320; Thr-tRNA-ligase_IIa.
DR   InterPro; IPR018163; Thr/Ala-tRNA-synth_IIc_edit.
DR   InterPro; IPR047246; ThrRS_anticodon.
DR   InterPro; IPR033728; ThrRS_core.
DR   InterPro; IPR012947; tRNA_SAD.
DR   NCBIfam; TIGR00418; thrS; 1.
DR   PANTHER; PTHR11451:SF44; THREONINE--TRNA LIGASE, CHLOROPLASTIC_MITOCHONDRIAL 2; 1.
DR   PANTHER; PTHR11451; THREONINE-TRNA LIGASE; 1.
DR   Pfam; PF03129; HGTP_anticodon; 1.
DR   Pfam; PF02824; TGS; 1.
DR   Pfam; PF00587; tRNA-synt_2b; 1.
DR   Pfam; PF07973; tRNA_SAD; 1.
DR   PRINTS; PR01047; TRNASYNTHTHR.
DR   SMART; SM00863; tRNA_SAD; 1.
DR   SUPFAM; SSF52954; Class II aaRS ABD-related; 1.
DR   SUPFAM; SSF55681; Class II aaRS and biotin synthetases; 1.
DR   SUPFAM; SSF81271; TGS-like; 1.
DR   SUPFAM; SSF55186; ThrRS/AlaRS common domain; 1.
DR   PROSITE; PS50862; AA_TRNA_LIGASE_II; 1.
DR   PROSITE; PS51880; TGS; 1.
PE   3: Inferred from homology;
KW   Aminoacyl-tRNA synthetase; ATP-binding; Cytoplasm; Ligase; Metal-binding;
KW   Nucleotide-binding; Protein biosynthesis; Reference proteome; RNA-binding;
KW   tRNA-binding; Zinc.
FT   CHAIN           1..633
FT                   /note="Threonine--tRNA ligase"
FT                   /id="PRO_1000199554"
FT   DOMAIN          1..61
FT                   /note="TGS"
FT                   /evidence="ECO:0000255|PROSITE-ProRule:PRU01228"
FT   REGION          242..533
FT                   /note="Catalytic"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00184"
FT   BINDING         333
FT                   /ligand="Zn(2+)"
FT                   /ligand_id="ChEBI:CHEBI:29105"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00184"
FT   BINDING         384
FT                   /ligand="Zn(2+)"
FT                   /ligand_id="ChEBI:CHEBI:29105"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00184"
FT   BINDING         510
FT                   /ligand="Zn(2+)"
FT                   /ligand_id="ChEBI:CHEBI:29105"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00184"
SQ   SEQUENCE   633 AA;  71580 MW;  C23244A849CF43FD CRC64;
     MPAIRLPDGS VRQFENPVSV HDVAASIGAG LARAALAGRV DGALVDTSFV IDHDVDLAIV
     TDKDADGLGI LRHSTAHLLA CAVKELFPEA QVTIGPEIEN GFYYDFSYKR PFTPEDLVAI
     EKKMAELAKK DIPVERYELP RDEAIAYFKS IGEAYKAEII ESIPQGEVLS LYREGNFTDL
     CRGPHVPSTG KLKVFKLMKV AGAYWRGDSK NEMLQRIYGT AWAKKEDLEA YLHMLEEAEK
     RDHRKLGRQL DLFHIQDEAP GMVFWHPKGW TLWQQVEQYM RRVLIANDYQ EVRTPQIVDR
     SLWEKSGHWA MYQDLMFTTE SEKRDYAVKP MNCPCHIQIF NQGLKSYRDL PLRMAEFGSC
     HRNEPSGSLH GIMRVRNFVQ DDAHIFCTEA QMQPETAAFI DLLQAVYQDF GFDNILIKLS
     TRPEKRVGAD ELWDQAEAAL AAALAAKGLA YELQPGEGAF YGPKIEFSLK DCLGRVWQCG
     TLQLDFNLPV RLGAEYVSED NAKKHPVMLH RAILGSLERF IGILIEHHAG AMPLWLAPVQ
     MAVLNITEAQ AEYATEVAET LKKQGFRVDL DLRNEKISYK IREHSLQKLP YQIIVGDKEK
     AGALVAVRAR TGEDLGQIPL SQFIERLKSE LLH
//