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SYI_STRT1
ID   SYI_STRT1               Reviewed;         929 AA.
AC   Q5M0C5;
DT   20-DEC-2005, integrated into UniProtKB/Swiss-Prot.
DT   01-FEB-2005, sequence version 1.
DT   03-AUG-2022, entry version 112.
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=str0741;
OS   Streptococcus thermophilus (strain CNRZ 1066).
OC   Bacteria; Firmicutes; Bacilli; Lactobacillales; Streptococcaceae;
OC   Streptococcus.
OX   NCBI_TaxID=299768;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=CNRZ 1066;
RX   PubMed=15543133; DOI=10.1038/nbt1034;
RA   Bolotin A., Quinquis B., Renault P., Sorokin A., Ehrlich S.D.,
RA   Kulakauskas S., Lapidus A., Goltsman E., Mazur M., Pusch G.D., Fonstein M.,
RA   Overbeek R., Kyprides N., Purnelle B., Prozzi D., Ngui K., Masuy D.,
RA   Hancy F., Burteau S., Boutry M., Delcour J., Goffeau A., Hols P.;
RT   "Complete sequence and comparative genome analysis of the dairy bacterium
RT   Streptococcus thermophilus.";
RL   Nat. Biotechnol. 22:1554-1558(2004).
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;
CC         Evidence={ECO:0000255|HAMAP-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; CP000024; AAV62334.1; -; Genomic_DNA.
DR   RefSeq; WP_002946450.1; NC_006449.1.
DR   AlphaFoldDB; Q5M0C5; -.
DR   SMR; Q5M0C5; -.
DR   GeneID; 66898641; -.
DR   KEGG; stc:str0741; -.
DR   HOGENOM; CLU_001493_7_1_9; -.
DR   OMA; HLGTAWN; -.
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   Gene3D; 3.40.50.620; -; 2.
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   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; 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; Metal-binding;
KW   Nucleotide-binding; Protein biosynthesis; Zinc.
FT   CHAIN           1..929
FT                   /note="Isoleucine--tRNA ligase"
FT                   /id="PRO_0000098487"
FT   MOTIF           57..67
FT                   /note="'HIGH' region"
FT   MOTIF           595..599
FT                   /note="'KMSKS' region"
FT   BINDING         554
FT                   /ligand="L-isoleucyl-5'-AMP"
FT                   /ligand_id="ChEBI:CHEBI:178002"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_02002"
FT   BINDING         598
FT                   /ligand="ATP"
FT                   /ligand_id="ChEBI:CHEBI:30616"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_02002"
FT   BINDING         888
FT                   /ligand="Zn(2+)"
FT                   /ligand_id="ChEBI:CHEBI:29105"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_02002"
FT   BINDING         891
FT                   /ligand="Zn(2+)"
FT                   /ligand_id="ChEBI:CHEBI:29105"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_02002"
FT   BINDING         908
FT                   /ligand="Zn(2+)"
FT                   /ligand_id="ChEBI:CHEBI:29105"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_02002"
FT   BINDING         911
FT                   /ligand="Zn(2+)"
FT                   /ligand_id="ChEBI:CHEBI:29105"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_02002"
SQ   SEQUENCE   929 AA;  105854 MW;  D769FF69E43E4EA8 CRC64;
     MKLKETLNLG KTSFPMRAGL PNKEPIWQKE WEEAKVYQRR QELNQGKPHF TLHDGPPYAN
     GNIHVGHAMN KISKDIIVRS KSMSGFYAPF IPGWDTHGLP IEQVLAKQGV KRKELDRAEY
     LKMCRDYALS QVDKQREDFK RLGVSADWEN PYVTLTPDYE AAQIRVFGEM AKKGYIYQGA
     KPVYWSWSSE SALAEAEIEY HDLVSTSLYY ANKVKDGKGV LDTDTYIVVW TTTPFTVTAS
     RGLTVGADIE YVLVKPAGET RKFIVASELL NSLSEKFAWE EVEVLNTYRG DELNQIVTEH
     PWDSEVDELV ILGEHVTTDS GTGIVHTAPG FGEDDYNVGV ANGLEVVVTV NERGIMMENA
     GPDFAGKFYD KVAPIVMEKL GDLLLAKEEI SHSYPFDWRT KKPIIWRAVP QWFASVSKFR
     QEILDEIEKV KFHSEWGKVR LYNMIRDRGD WVISRQRAWG VPLPIFYAED RTPIMTEETI
     EHVAKLFEEH GSVIWWERDA KDLLPEGFTH PGSPNGEFTK ENDIMDVWFD SGSSWNGVVV
     NRPELTYPAD LYLEGSDQYR GWFNSSLITS VANHGVAPYK QLLSQGFALD GKGEKMSKSL
     GNTIAPSDVE KQFGAEILRL WVTSVDTSND VRISMDILSQ VSESYRKIRN TLRFLIANTS
     DFNPTTDAVA FEDLRSVDQY MTIRFNQLVK NIRDAYENFE FLTIYKSLVN FINVELSAFY
     LDFAKDVVYI ESAKSLERRQ MQTVFYDILV KITKLLTPIL PHTAEEIWSY LEFENEDYVQ
     LSELPEAEDF ANQDALLEKW NAFMDFRGKA QKALEEARNE KVIGKSLEAH LTIYPDAEVK
     ELLESLNTNL AQLLIVSALT IAEGDVPESA VRFQGVSFTV ERAEGEVCDR CRRIDPTTKE
     RSYNATICNH CASIIEENFA EVVAEGFEV
 
 
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