ID   TGT_ACIF2               Reviewed;         371 AA.
AC   B7J4R9;
DT   14-APR-2009, integrated into UniProtKB/Swiss-Prot.
DT   10-FEB-2009, sequence version 1.
DT   03-AUG-2022, entry version 69.
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=AFE_2059;
OS   Acidithiobacillus ferrooxidans (strain ATCC 23270 / DSM 14882 / CIP 104768
OS   / NCIMB 8455) (Ferrobacillus ferrooxidans (strain ATCC 23270)).
OC   Bacteria; Proteobacteria; Acidithiobacillia; Acidithiobacillales;
OC   Acidithiobacillaceae; Acidithiobacillus.
OX   NCBI_TaxID=243159;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=ATCC 23270 / DSM 14882 / CIP 104768 / NCIMB 8455;
RX   PubMed=19077236; DOI=10.1186/1471-2164-9-597;
RA   Valdes J., Pedroso I., Quatrini R., Dodson R.J., Tettelin H., Blake R. II,
RA   Eisen J.A., Holmes D.S.;
RT   "Acidithiobacillus ferrooxidans metabolism: from genome sequence to
RT   industrial applications.";
RL   BMC Genomics 9:597-597(2008).
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; CP001219; ACK79529.1; -; Genomic_DNA.
DR   RefSeq; WP_012536938.1; NC_011761.1.
DR   AlphaFoldDB; B7J4R9; -.
DR   SMR; B7J4R9; -.
DR   STRING; 243159.AFE_2059; -.
DR   PaxDb; B7J4R9; -.
DR   EnsemblBacteria; ACK79529; ACK79529; AFE_2059.
DR   GeneID; 66432826; -.
DR   KEGG; afr:AFE_2059; -.
DR   eggNOG; COG0343; Bacteria.
DR   HOGENOM; CLU_022060_0_1_6; -.
DR   OMA; GIDLFDC; -.
DR   OrthoDB; 1165356at2; -.
DR   UniPathway; UPA00392; -.
DR   Proteomes; UP000001362; 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..371
FT                   /note="Queuine tRNA-ribosyltransferase"
FT                   /id="PRO_1000197972"
FT   REGION          243..249
FT                   /note="RNA binding"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00168"
FT   REGION          267..271
FT                   /note="RNA binding; important for wobble base 34
FT                   recognition"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00168"
FT   ACT_SITE        90
FT                   /note="Proton acceptor"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00168"
FT   ACT_SITE        262
FT                   /note="Nucleophile"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00168"
FT   BINDING         90..94
FT                   /ligand="substrate"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00168"
FT   BINDING         144
FT                   /ligand="substrate"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00168"
FT   BINDING         185
FT                   /ligand="substrate"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00168"
FT   BINDING         212
FT                   /ligand="substrate"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00168"
FT   BINDING         300
FT                   /ligand="Zn(2+)"
FT                   /ligand_id="ChEBI:CHEBI:29105"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00168"
FT   BINDING         302
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         331
FT                   /ligand="Zn(2+)"
FT                   /ligand_id="ChEBI:CHEBI:29105"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00168"
SQ   SEQUENCE   371 AA;  41070 MW;  CBDEFE7012AD9BE6 CRC64;
     MSIFQLLARD GAARRGTIRL PRGTVQTPAF MPVGTYGTVK AMSPEELKTL GAEIILGNTF
     HLFLRPGLEV ISAVGGLHRM MHWDRPILTD SGGFQVFSLG ALRKLTEAGV QFRAPTDGHM
     VFLGPEESMQ IQAALGSDIA MVFDECTPHP ASYEEARVSM ELSLRWAARS HAAYAGPGEL
     FGIVQGGMYA DLRRRSLAGL QRLDFPGLAI GGLSVGESKV EMMQVLDDLM PHMPADRPRY
     LMGVGTPEDL VEGVRRGVDM FDCVMPTRNA RNGWLFTRDG VLKLRNARYE KDVLPPDPAC
     ACYTCQNYSR AYLRHLQRSH EILGARLNTL HNLHYYQELM AGLREAIAAG RLDAYADDFY
     RRRRAGSLVG A