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TGT_DICNV
ID   TGT_DICNV               Reviewed;         369 AA.
AC   A5EW66;
DT   15-JAN-2008, integrated into UniProtKB/Swiss-Prot.
DT   12-JUN-2007, sequence version 1.
DT   03-AUG-2022, entry version 80.
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=DNO_0319;
OS   Dichelobacter nodosus (strain VCS1703A).
OC   Bacteria; Proteobacteria; Gammaproteobacteria; Cardiobacteriales;
OC   Cardiobacteriaceae; Dichelobacter.
OX   NCBI_TaxID=246195;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=VCS1703A;
RX   PubMed=17468768; DOI=10.1038/nbt1302;
RA   Myers G.S.A., Parker D., Al-Hasani K., Kennan R.M., Seemann T., Ren Q.,
RA   Badger J.H., Selengut J.D., Deboy R.T., Tettelin H., Boyce J.D.,
RA   McCarl V.P., Han X., Nelson W.C., Madupu R., Mohamoud Y., Holley T.,
RA   Fedorova N., Khouri H., Bottomley S.P., Whittington R.J., Adler B.,
RA   Songer J.G., Rood J.I., Paulsen I.T.;
RT   "Genome sequence and identification of candidate vaccine antigens from the
RT   animal pathogen Dichelobacter nodosus.";
RL   Nat. Biotechnol. 25:569-575(2007).
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; CP000513; ABQ13409.1; -; Genomic_DNA.
DR   AlphaFoldDB; A5EW66; -.
DR   SMR; A5EW66; -.
DR   STRING; 246195.DNO_0319; -.
DR   PRIDE; A5EW66; -.
DR   EnsemblBacteria; ABQ13409; ABQ13409; DNO_0319.
DR   KEGG; dno:DNO_0319; -.
DR   eggNOG; COG0343; Bacteria.
DR   HOGENOM; CLU_022060_0_1_6; -.
DR   OMA; GIDLFDC; -.
DR   UniPathway; UPA00392; -.
DR   Proteomes; UP000000248; 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..369
FT                   /note="Queuine tRNA-ribosyltransferase"
FT                   /id="PRO_1000016786"
FT   REGION          244..250
FT                   /note="RNA binding"
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        263
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         186
FT                   /ligand="substrate"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00168"
FT   BINDING         213
FT                   /ligand="substrate"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00168"
FT   BINDING         301
FT                   /ligand="Zn(2+)"
FT                   /ligand_id="ChEBI:CHEBI:29105"
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         306
FT                   /ligand="Zn(2+)"
FT                   /ligand_id="ChEBI:CHEBI:29105"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00168"
FT   BINDING         332
FT                   /ligand="Zn(2+)"
FT                   /ligand_id="ChEBI:CHEBI:29105"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00168"
SQ   SEQUENCE   369 AA;  41907 MW;  407D6CE90D3DE783 CRC64;
     MNYECMTQDG RARRGRIIFD NGQIVQTPVF MPVGTQATVK GLSPEELDAL GAEIILGNTF
     HLMLRPGAEI IQAHGGLHQF MHWQKPILTD SGGFQVFSLA KIRKLTEEGA RFRSPIDGRE
     VFLTPEKSIA VQHALNSNII MQLDECTPYP ATYDEAANSM RMSLRWARRS QQAHGDHANH
     LFGIVQGGIY PDLRQESAQA LVELDLPGYA IGGLAVGEPK DAREATLDAV LPFVPKNKPR
     YLMGVGKPAD LVEGVRRGID MFDCVMPSRN ARNAYLFTRF GILKLRNSRY KEDLRPIDET
     CNCYTCQRYS RSYLHHLDKC NEILGARLNT IHNLYYYVHL MHEMRRAIEE HRFDDFARAF
     YAEQECGND
 
 
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