ID   SYI_CALS8               Reviewed;         920 AA.
AC   A4XKR2;
DT   15-JAN-2008, integrated into UniProtKB/Swiss-Prot.
DT   29-MAY-2007, sequence version 1.
DT   27-MAR-2024, entry version 99.
DE   RecName: Full=Isoleucine--tRNA ligase {ECO:0000255|HAMAP-Rule:MF_02002};
DE            EC=6.1.1.5 {ECO:0000255|HAMAP-Rule:MF_02002};
DE   AltName: Full=Isoleucyl-tRNA synthetase {ECO:0000255|HAMAP-Rule:MF_02002};
DE            Short=IleRS {ECO:0000255|HAMAP-Rule:MF_02002};
GN   Name=ileS {ECO:0000255|HAMAP-Rule:MF_02002};
GN   OrderedLocusNames=Csac_1912;
OS   Caldicellulosiruptor saccharolyticus (strain ATCC 43494 / DSM 8903 / Tp8T
OS   6331).
OC   Bacteria; Bacillota; Clostridia; Caldicellulosiruptorales;
OC   Caldicellulosiruptoraceae; Caldicellulosiruptor.
OX   NCBI_TaxID=351627;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=ATCC 43494 / DSM 8903 / Tp8T 6331;
RA   Copeland A., Lucas S., Lapidus A., Barry K., Detter J.C.,
RA   Glavina del Rio T., Hammon N., Israni S., Dalin E., Tice H., Pitluck S.,
RA   Kiss H., Brettin T., Bruce D., Han C., Schmutz J., Larimer F., Land M.,
RA   Hauser L., Kyrpides N., Lykidis A., van de Werken H.J.G., Verhaart M.R.A.,
RA   VanFossen A.L., Lewis D.L., Nichols J.D., Goorissen H.P., van Niel E.W.J.,
RA   Stams F.J.M., Willquist K.U., Ward D.E., van der Oost J., Kelly R.M.,
RA   Kengen S.M.W., Richardson P.;
RT   "Genome sequence of the thermophilic hydrogen-producing bacterium
RT   Caldicellulosiruptor saccharolyticus DSM 8903.";
RL   Submitted (APR-2007) to the EMBL/GenBank/DDBJ databases.
CC   -!- FUNCTION: Catalyzes the attachment of isoleucine to tRNA(Ile). As IleRS
CC       can inadvertently accommodate and process structurally similar amino
CC       acids such as valine, to avoid such errors it has two additional
CC       distinct tRNA(Ile)-dependent editing activities. One activity is
CC       designated as 'pretransfer' editing and involves the hydrolysis of
CC       activated Val-AMP. The other activity is designated 'posttransfer'
CC       editing and involves deacylation of mischarged Val-tRNA(Ile).
CC       {ECO:0000255|HAMAP-Rule:MF_02002}.
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=ATP + L-isoleucine + tRNA(Ile) = AMP + diphosphate + L-
CC         isoleucyl-tRNA(Ile); Xref=Rhea:RHEA:11060, Rhea:RHEA-COMP:9666,
CC         Rhea:RHEA-COMP:9695, ChEBI:CHEBI:30616, ChEBI:CHEBI:33019,
CC         ChEBI:CHEBI:58045, ChEBI:CHEBI:78442, ChEBI:CHEBI:78528,
CC         ChEBI:CHEBI:456215; EC=6.1.1.5; Evidence={ECO:0000255|HAMAP-
CC         Rule:MF_02002};
CC   -!- COFACTOR:
CC       Name=Zn(2+); Xref=ChEBI:CHEBI:29105; Evidence={ECO:0000255|HAMAP-
CC         Rule:MF_02002};
CC       Note=Binds 1 zinc ion per subunit. {ECO:0000255|HAMAP-Rule:MF_02002};
CC   -!- SUBUNIT: Monomer. {ECO:0000255|HAMAP-Rule:MF_02002}.
CC   -!- SUBCELLULAR LOCATION: Cytoplasm {ECO:0000255|HAMAP-Rule:MF_02002}.
CC   -!- DOMAIN: IleRS has two distinct active sites: one for aminoacylation and
CC       one for editing. The misactivated valine is translocated from the
CC       active site to the editing site, which sterically excludes the
CC       correctly activated isoleucine. The single editing site contains two
CC       valyl binding pockets, one specific for each substrate (Val-AMP or Val-
CC       tRNA(Ile)). {ECO:0000255|HAMAP-Rule:MF_02002}.
CC   -!- SIMILARITY: Belongs to the class-I aminoacyl-tRNA synthetase family.
CC       IleS type 1 subfamily. {ECO:0000255|HAMAP-Rule:MF_02002}.
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DR   EMBL; CP000679; ABP67497.1; -; Genomic_DNA.
DR   RefSeq; WP_011917433.1; NC_009437.1.
DR   AlphaFoldDB; A4XKR2; -.
DR   SMR; A4XKR2; -.
DR   STRING; 351627.Csac_1912; -.
DR   KEGG; csc:Csac_1912; -.
DR   eggNOG; COG0060; Bacteria.
DR   HOGENOM; CLU_001493_7_0_9; -.
DR   OrthoDB; 9810365at2; -.
DR   Proteomes; UP000000256; Chromosome.
DR   GO; GO:0005737; C:cytoplasm; IEA:UniProtKB-SubCell.
DR   GO; GO:0002161; F:aminoacyl-tRNA editing activity; IEA:InterPro.
DR   GO; GO:0005524; F:ATP binding; IEA:UniProtKB-UniRule.
DR   GO; GO:0004822; F:isoleucine-tRNA ligase activity; IEA:UniProtKB-UniRule.
DR   GO; GO:0000049; F:tRNA binding; IEA:InterPro.
DR   GO; GO:0008270; F:zinc ion binding; IEA:UniProtKB-UniRule.
DR   GO; GO:0006428; P:isoleucyl-tRNA aminoacylation; IEA:UniProtKB-UniRule.
DR   CDD; cd07960; Anticodon_Ia_Ile_BEm; 1.
DR   CDD; cd00818; IleRS_core; 1.
DR   Gene3D; 1.10.730.20; -; 1.
DR   Gene3D; 3.40.50.620; HUPs; 2.
DR   Gene3D; 1.10.10.830; Ile-tRNA synthetase CP2 domain-like; 1.
DR   HAMAP; MF_02002; Ile_tRNA_synth_type1; 1.
DR   InterPro; IPR001412; aa-tRNA-synth_I_CS.
DR   InterPro; IPR002300; aa-tRNA-synth_Ia.
DR   InterPro; IPR033708; Anticodon_Ile_BEm.
DR   InterPro; IPR002301; Ile-tRNA-ligase.
DR   InterPro; IPR023585; Ile-tRNA-ligase_type1.
DR   InterPro; IPR013155; M/V/L/I-tRNA-synth_anticd-bd.
DR   InterPro; IPR014729; Rossmann-like_a/b/a_fold.
DR   InterPro; IPR009080; tRNAsynth_Ia_anticodon-bd.
DR   InterPro; IPR009008; Val/Leu/Ile-tRNA-synth_edit.
DR   InterPro; IPR010663; Znf_FPG/IleRS.
DR   NCBIfam; TIGR00392; ileS; 1.
DR   PANTHER; PTHR42765:SF1; ISOLEUCINE--TRNA LIGASE, MITOCHONDRIAL; 1.
DR   PANTHER; PTHR42765; SOLEUCYL-TRNA SYNTHETASE; 1.
DR   Pfam; PF08264; Anticodon_1; 1.
DR   Pfam; PF00133; tRNA-synt_1; 1.
DR   Pfam; PF06827; zf-FPG_IleRS; 1.
DR   PRINTS; PR00984; TRNASYNTHILE.
DR   SUPFAM; SSF47323; Anticodon-binding domain of a subclass of class I aminoacyl-tRNA synthetases; 1.
DR   SUPFAM; SSF52374; Nucleotidylyl transferase; 1.
DR   SUPFAM; SSF50677; ValRS/IleRS/LeuRS editing domain; 1.
DR   PROSITE; PS00178; AA_TRNA_LIGASE_I; 1.
PE   3: Inferred from homology;
KW   Aminoacyl-tRNA synthetase; ATP-binding; Cytoplasm; Ligase; Metal-binding;
KW   Nucleotide-binding; Protein biosynthesis; Zinc.
FT   CHAIN           1..920
FT                   /note="Isoleucine--tRNA ligase"
FT                   /id="PRO_1000022052"
FT   MOTIF           57..67
FT                   /note="'HIGH' region"
FT   MOTIF           601..605
FT                   /note="'KMSKS' region"
FT   BINDING         560
FT                   /ligand="L-isoleucyl-5'-AMP"
FT                   /ligand_id="ChEBI:CHEBI:178002"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_02002"
FT   BINDING         604
FT                   /ligand="ATP"
FT                   /ligand_id="ChEBI:CHEBI:30616"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_02002"
FT   BINDING         890
FT                   /ligand="Zn(2+)"
FT                   /ligand_id="ChEBI:CHEBI:29105"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_02002"
FT   BINDING         893
FT                   /ligand="Zn(2+)"
FT                   /ligand_id="ChEBI:CHEBI:29105"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_02002"
FT   BINDING         910
FT                   /ligand="Zn(2+)"
FT                   /ligand_id="ChEBI:CHEBI:29105"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_02002"
FT   BINDING         913
FT                   /ligand="Zn(2+)"
FT                   /ligand_id="ChEBI:CHEBI:29105"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_02002"
SQ   SEQUENCE   920 AA;  107030 MW;  C35E80AF111A9BFF CRC64;
     MDWSQTLNLP KTDFPMRANL AQREPQFLRF WEENDIFKKM LKKNRNNKKF ILHDGPPYAN
     GDIHLGHALN KVLKDIVNKY KSLQGYYTPY IPGWDTHGLP IEQQVIKKLG VNRHEVDPVE
     FRKKCKEFAL SYIDIQRQQF KRLGVFGEWE DPYMTLDPKF EARQIRVFGE MAKKGYIYKG
     LKPVYWCPSC ETALAEAEIE YQEDKTYSIY VKFEVIDDKG LFANLNLSGK KVYIVIWTTT
     TWTLPGNLAI ALNTDFDYSL VDVGNEILIV ASELVERVMK TNKIDQYHEI ARFKGKDLEY
     VKCKHPFLDR TSLVILGEHV TLEAGTGCVH TAPGHGEEDF EVCERYNIPV IVPVDNKGYL
     TQEAGKFAGL FYEDSNKEIA KELEASDHLL GVEKITHQYP HCWRCKNPVI FRATEQWFAS
     VKGFREEALK AVDDVKWVPE WGRDRIYNMI ADRQDWCISR QRIWGVPIPI FYCKNCRKEL
     ITDETIDHIA KIFEKEGSDA WFSKDVKELL PEGTKCPVCG CMEFEKETDI MDVWFDSGSS
     HAYVLESRED LEWPCDMYLE GNDQYRGWFQ SSLLTAVATK GRAPYRIVLT HGFVVDGEGK
     KMSKSEGNVI SPFDIINEFG ADILRLWCVS ADYTTDMRIS KDIIKQLTEI YRKIRNTARF
     LLGNLYDFNP KTDKVGCENL KEIDKWALQR LYKLIEKVTK AYEEYDYNQV YHLVHNFCVI
     DMSNLYLDIN KDRLYASKSE SLDRRSAQTV MYEILVALTK LIAPILSFTA EEIWQNIIFK
     EEDAESVFLT SWPKVNENIL KDETLEEKWN KIIEIKDIVA KQLEIARNEK LIGSSLDSKV
     KIFAKGNIKR FIEENKDIIQ EVLIVSQLEV EEGDSDQIKV EVYKADGLKC ERCWKFDTMV
     GKNEENLNVC PRCYEVVKVK
//