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TGT_THEAB
ID   TGT_THEAB               Reviewed;         367 AA.
AC   B7IDU1;
DT   14-APR-2009, integrated into UniProtKB/Swiss-Prot.
DT   10-FEB-2009, sequence version 1.
DT   03-AUG-2022, entry version 86.
DE   RecName: Full=Queuine tRNA-ribosyltransferase {ECO:0000255|HAMAP-Rule:MF_00168};
DE            EC=2.4.2.29 {ECO:0000255|HAMAP-Rule:MF_00168};
DE   AltName: Full=Guanine insertion enzyme {ECO:0000255|HAMAP-Rule:MF_00168};
DE   AltName: Full=tRNA-guanine transglycosylase {ECO:0000255|HAMAP-Rule:MF_00168};
GN   Name=tgt {ECO:0000255|HAMAP-Rule:MF_00168}; OrderedLocusNames=THA_1733;
OS   Thermosipho africanus (strain TCF52B).
OC   Bacteria; Thermotogae; Thermotogales; Fervidobacteriaceae; Thermosipho.
OX   NCBI_TaxID=484019;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=TCF52B;
RX   PubMed=19124572; DOI=10.1128/jb.01448-08;
RA   Nesboe C.L., Bapteste E., Curtis B., Dahle H., Lopez P., Macleod D.,
RA   Dlutek M., Bowman S., Zhaxybayeva O., Birkeland N.-K., Doolittle W.F.;
RT   "The genome of Thermosipho africanus TCF52B: lateral genetic connections to
RT   the Firmicutes and Archaea.";
RL   J. Bacteriol. 191:1974-1978(2009).
CC   -!- FUNCTION: Catalyzes the base-exchange of a guanine (G) residue with the
CC       queuine precursor 7-aminomethyl-7-deazaguanine (PreQ1) at position 34
CC       (anticodon wobble position) in tRNAs with GU(N) anticodons (tRNA-Asp,
CC       -Asn, -His and -Tyr). Catalysis occurs through a double-displacement
CC       mechanism. The nucleophile active site attacks the C1' of nucleotide 34
CC       to detach the guanine base from the RNA, forming a covalent enzyme-RNA
CC       intermediate. The proton acceptor active site deprotonates the incoming
CC       PreQ1, allowing a nucleophilic attack on the C1' of the ribose to form
CC       the product. After dissociation, two additional enzymatic reactions on
CC       the tRNA convert PreQ1 to queuine (Q), resulting in the hypermodified
CC       nucleoside queuosine (7-(((4,5-cis-dihydroxy-2-cyclopenten-1-
CC       yl)amino)methyl)-7-deazaguanosine). {ECO:0000255|HAMAP-Rule:MF_00168}.
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=7-aminomethyl-7-carbaguanine + guanosine(34) in tRNA = 7-
CC         aminomethyl-7-carbaguanosine(34) in tRNA + guanine;
CC         Xref=Rhea:RHEA:24104, Rhea:RHEA-COMP:10341, Rhea:RHEA-COMP:10342,
CC         ChEBI:CHEBI:16235, ChEBI:CHEBI:58703, ChEBI:CHEBI:74269,
CC         ChEBI:CHEBI:82833; EC=2.4.2.29; Evidence={ECO:0000255|HAMAP-
CC         Rule:MF_00168};
CC   -!- COFACTOR:
CC       Name=Zn(2+); Xref=ChEBI:CHEBI:29105;
CC         Evidence={ECO:0000255|HAMAP-Rule:MF_00168};
CC       Note=Binds 1 zinc ion per subunit. {ECO:0000255|HAMAP-Rule:MF_00168};
CC   -!- PATHWAY: tRNA modification; tRNA-queuosine biosynthesis.
CC       {ECO:0000255|HAMAP-Rule:MF_00168}.
CC   -!- SUBUNIT: Homodimer. Within each dimer, one monomer is responsible for
CC       RNA recognition and catalysis, while the other monomer binds to the
CC       replacement base PreQ1. {ECO:0000255|HAMAP-Rule:MF_00168}.
CC   -!- SIMILARITY: Belongs to the queuine tRNA-ribosyltransferase family.
CC       {ECO:0000255|HAMAP-Rule:MF_00168}.
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DR   EMBL; CP001185; ACJ76168.1; -; Genomic_DNA.
DR   RefSeq; WP_012580376.1; NC_011653.1.
DR   AlphaFoldDB; B7IDU1; -.
DR   SMR; B7IDU1; -.
DR   STRING; 484019.THA_1733; -.
DR   EnsemblBacteria; ACJ76168; ACJ76168; THA_1733.
DR   KEGG; taf:THA_1733; -.
DR   eggNOG; COG0343; Bacteria.
DR   HOGENOM; CLU_022060_0_1_0; -.
DR   OMA; GIDLFDC; -.
DR   OrthoDB; 1165356at2; -.
DR   UniPathway; UPA00392; -.
DR   Proteomes; UP000002453; Chromosome.
DR   GO; GO:0046872; F:metal ion binding; IEA:UniProtKB-KW.
DR   GO; GO:0008479; F:queuine tRNA-ribosyltransferase activity; IEA:UniProtKB-UniRule.
DR   GO; GO:0008616; P:queuosine biosynthetic process; IEA:UniProtKB-UniRule.
DR   GO; GO:0101030; P:tRNA-guanine transglycosylation; IEA:InterPro.
DR   Gene3D; 3.20.20.105; -; 1.
DR   HAMAP; MF_00168; Q_tRNA_Tgt; 1.
DR   InterPro; IPR004803; TGT.
DR   InterPro; IPR036511; TGT-like_sf.
DR   InterPro; IPR002616; tRNA_ribo_trans-like.
DR   Pfam; PF01702; TGT; 1.
DR   SUPFAM; SSF51713; SSF51713; 1.
DR   TIGRFAMs; TIGR00430; Q_tRNA_tgt; 1.
DR   TIGRFAMs; TIGR00449; tgt_general; 1.
PE   3: Inferred from homology;
KW   Glycosyltransferase; Metal-binding; Queuosine biosynthesis;
KW   Reference proteome; Transferase; tRNA processing; Zinc.
FT   CHAIN           1..367
FT                   /note="Queuine tRNA-ribosyltransferase"
FT                   /id="PRO_1000198033"
FT   REGION          270..274
FT                   /note="RNA binding; important for wobble base 34
FT                   recognition"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00168"
FT   ACT_SITE        91
FT                   /note="Proton acceptor"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00168"
FT   ACT_SITE        265
FT                   /note="Nucleophile"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00168"
FT   BINDING         91..95
FT                   /ligand="substrate"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00168"
FT   BINDING         145
FT                   /ligand="substrate"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00168"
FT   BINDING         188
FT                   /ligand="substrate"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00168"
FT   BINDING         215
FT                   /ligand="substrate"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00168"
FT   BINDING         303
FT                   /ligand="Zn(2+)"
FT                   /ligand_id="ChEBI:CHEBI:29105"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00168"
FT   BINDING         305
FT                   /ligand="Zn(2+)"
FT                   /ligand_id="ChEBI:CHEBI:29105"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00168"
FT   BINDING         308
FT                   /ligand="Zn(2+)"
FT                   /ligand_id="ChEBI:CHEBI:29105"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00168"
FT   BINDING         334
FT                   /ligand="Zn(2+)"
FT                   /ligand_id="ChEBI:CHEBI:29105"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00168"
SQ   SEQUENCE   367 AA;  41218 MW;  6E7C1E9B32BB8537 CRC64;
     MGLKFELLKT SGNARRGRIY LPHGVVETPT FMPVGTNANV KLMTPKLLDE IGAQIILGNA
     FHLYLKPGLD VFRFHGGIHN FMNWQKPVLT DSGGFQVFSL REGRKITEDG VLIRSPLDGS
     KHMITPELSM EIQHAIGSDI VMAFDYCAEP GISHQDAVVA LELTSLWAER SLKKLRSLSD
     QAIFGIVQGA FFKDLRLRSA KEITSMNFDG FAIGGLSVGE EYDITLDMTK FTAPLLPENK
     PRYFMGAGSP KLIVDLVDSG IDMFDSVLPT RVARHGQALT WKGKLNIRSA KYKFSKEPID
     ESCGCYTCKN FSRSYIRHLF DRGEVLGQIL LTIHNLHFMM DLSKKIRESI ENDTFQELRG
     EVLKYYA
 
 
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