ID   SYI_CAUVC               Reviewed;         969 AA.
AC   Q9AAA5;
DT   20-DEC-2005, integrated into UniProtKB/Swiss-Prot.
DT   01-JUN-2001, sequence version 1.
DT   03-AUG-2022, entry version 116.
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}; OrderedLocusNames=CC_0701;
OS   Caulobacter vibrioides (strain ATCC 19089 / CB15) (Caulobacter crescentus).
OC   Bacteria; Proteobacteria; Alphaproteobacteria; Caulobacterales;
OC   Caulobacteraceae; Caulobacter.
OX   NCBI_TaxID=190650;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=ATCC 19089 / CB15;
RX   PubMed=11259647; DOI=10.1073/pnas.061029298;
RA   Nierman W.C., Feldblyum T.V., Laub M.T., Paulsen I.T., Nelson K.E.,
RA   Eisen J.A., Heidelberg J.F., Alley M.R.K., Ohta N., Maddock J.R.,
RA   Potocka I., Nelson W.C., Newton A., Stephens C., Phadke N.D., Ely B.,
RA   DeBoy R.T., Dodson R.J., Durkin A.S., Gwinn M.L., Haft D.H., Kolonay J.F.,
RA   Smit J., Craven M.B., Khouri H.M., Shetty J., Berry K.J., Utterback T.R.,
RA   Tran K., Wolf A.M., Vamathevan J.J., Ermolaeva M.D., White O.,
RA   Salzberg S.L., Venter J.C., Shapiro L., Fraser C.M.;
RT   "Complete genome sequence of Caulobacter crescentus.";
RL   Proc. Natl. Acad. Sci. U.S.A. 98:4136-4141(2001).
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   -!- 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; AE005673; AAK22686.1; -; Genomic_DNA.
DR   PIR; B87336; B87336.
DR   RefSeq; NP_419518.1; NC_002696.2.
DR   RefSeq; WP_010918587.1; NC_002696.2.
DR   AlphaFoldDB; Q9AAA5; -.
DR   SMR; Q9AAA5; -.
DR   STRING; 190650.CC_0701; -.
DR   EnsemblBacteria; AAK22686; AAK22686; CC_0701.
DR   KEGG; ccr:CC_0701; -.
DR   PATRIC; fig|190650.5.peg.710; -.
DR   eggNOG; COG0060; Bacteria.
DR   HOGENOM; CLU_001493_7_1_5; -.
DR   OMA; PSWYIRT; -.
DR   BioCyc; CAULO:CC0701-MON; -.
DR   Proteomes; UP000001816; 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:0006428; P:isoleucyl-tRNA aminoacylation; IEA:UniProtKB-UniRule.
DR   CDD; cd07960; Anticodon_Ia_Ile_BEm; 1.
DR   Gene3D; 3.40.50.620; -; 2.
DR   Gene3D; 3.90.740.10; -; 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   Pfam; PF08264; Anticodon_1; 1.
DR   Pfam; PF00133; tRNA-synt_1; 1.
DR   PRINTS; PR00984; TRNASYNTHILE.
DR   SUPFAM; SSF47323; SSF47323; 1.
DR   SUPFAM; SSF50677; SSF50677; 1.
DR   TIGRFAMs; TIGR00392; ileS; 1.
DR   PROSITE; PS00178; AA_TRNA_LIGASE_I; 1.
PE   3: Inferred from homology;
KW   Aminoacyl-tRNA synthetase; ATP-binding; Cytoplasm; Ligase;
KW   Nucleotide-binding; Protein biosynthesis; Reference proteome.
FT   CHAIN           1..969
FT                   /note="Isoleucine--tRNA ligase"
FT                   /id="PRO_0000098374"
FT   MOTIF           70..80
FT                   /note="'HIGH' region"
FT   MOTIF           642..646
FT                   /note="'KMSKS' region"
FT   BINDING         601
FT                   /ligand="L-isoleucyl-5'-AMP"
FT                   /ligand_id="ChEBI:CHEBI:178002"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_02002"
FT   BINDING         645
FT                   /ligand="ATP"
FT                   /ligand_id="ChEBI:CHEBI:30616"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_02002"
SQ   SEQUENCE   969 AA;  108637 MW;  C7CEE8311F59B174 CRC64;
     MADDATTARD YRETVFLPDT PFPMRAGLPK KEPEILEGWA ALSEKGLYGA VRQKRQAAGA
     PLFVFHDGPP YANGAIHIGH ALNKILKDFV VRSRFALGYD VDYVPGWDCH GLPIEWKIEE
     QFRAKGRRKD EVPAEEFRRE CRAYAGGWIE AQKTEFQRLG VLGDWWNRYA TMDFTSEAKI
     VEEFHKFLAT GQLYRGSKPV MWSPVERTAL ADAEIEYHDH VSPTIWVKFP VVQGSDAAVG
     AKLVIWTTTP WTIPANRAVS YNPDIPYSVF EVTALEEGLE FEPWAKPGDR LIIADKLAED
     VFKAAKVASW KTVEAVDCEG MVLAHPLADL DSHYGYAVPM LAGDHVTDDA GTGFVHTAPG
     HGADDYQVWL AHGHREIPDT VDPDGAYYPH VALFAGLKVL ETEGKKVGKF GPANGAVMEK
     LIEAGNLLAR GRVEHSYPHS WRSKAPVIFR NTPQWFIRMD HAVDSLDGKT LREVAVQAIA
     DTAFYPDGGR NRIGAMVETR PDWLISRQRN WGTPLAMFVD KHTGHPLNDP EVNARILAAI
     REGGADAWFT RPDADFLGAH DPAQYEKITD ILDVWFDSGC THAFTIEGRA DSAWPADLYL
     EGSDQHRGWF QSSLLEGCGT RGRAPYKAVV THGFTMDENG EKMSKSRGNT IEPQTITKES
     GAEILRLWTA MVDYQEDQRI GKTILATTTD AYRKLRNTMR YLLGALAGFD EEERVTDYDQ
     FPALEKYILH RLWELDGQVR EAYQSYRFSD VIRPLIEFCQ GDLSALYFDV RRDSLYCDRP
     DALKRRAYRT ALDYVFDRLT IWLAPLASFT MEEAWTTRFP EAGPVAYRVM PERVDAWRND
     AEAARWAKVE KVTSVVTGAL EVERREKRIG SALEAAPVVH FADEDLLAAF EGLDAGEVFR
     TSSATLVAGD AGAFRVDEVK GVSVDPNKAE GKKCARSWRI LPEVGTDPRY PELSLRDADA
     VAYWDAGRG