TGT_THEP1
ID TGT_THEP1 Reviewed; 369 AA.
AC A5IM22;
DT 15-JAN-2008, integrated into UniProtKB/Swiss-Prot.
DT 26-JUN-2007, sequence version 1.
DT 03-AUG-2022, entry version 78.
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=Tpet_1231;
OS Thermotoga petrophila (strain ATCC BAA-488 / DSM 13995 / JCM 10881 /
OS RKU-1).
OC Bacteria; Thermotogae; Thermotogales; Thermotogaceae; Thermotoga.
OX NCBI_TaxID=390874;
RN [1]
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=ATCC BAA-488 / DSM 13995 / JCM 10881 / RKU-1;
RG US DOE Joint Genome Institute;
RA Copeland A., Lucas S., Lapidus A., Barry K., Glavina del Rio T., Dalin E.,
RA Tice H., Pitluck S., Sims D., Brettin T., Bruce D., Detter J.C., Han C.,
RA Tapia R., Schmutz J., Larimer F., Land M., Hauser L., Kyrpides N.,
RA Mikhailova N., Nelson K., Gogarten J.P., Noll K., Richardson P.;
RT "Complete sequence of Thermotoga petrophila RKU-1.";
RL Submitted (MAY-2007) to the EMBL/GenBank/DDBJ databases.
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; CP000702; ABQ47245.1; -; Genomic_DNA.
DR RefSeq; WP_004081969.1; NC_009486.1.
DR AlphaFoldDB; A5IM22; -.
DR SMR; A5IM22; -.
DR STRING; 390874.Tpet_1231; -.
DR EnsemblBacteria; ABQ47245; ABQ47245; Tpet_1231.
DR KEGG; tpt:Tpet_1231; -.
DR eggNOG; COG0343; Bacteria.
DR HOGENOM; CLU_022060_0_1_0; -.
DR OMA; GIDLFDC; -.
DR UniPathway; UPA00392; -.
DR Proteomes; UP000006558; 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; Transferase;
KW tRNA processing; Zinc.
FT CHAIN 1..369
FT /note="Queuine tRNA-ribosyltransferase"
FT /id="PRO_1000016884"
FT REGION 242..248
FT /note="RNA binding"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00168"
FT REGION 266..270
FT /note="RNA binding; important for wobble base 34
FT recognition"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00168"
FT ACT_SITE 89
FT /note="Proton acceptor"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00168"
FT ACT_SITE 261
FT /note="Nucleophile"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00168"
FT BINDING 89..93
FT /ligand="substrate"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00168"
FT BINDING 142
FT /ligand="substrate"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00168"
FT BINDING 184
FT /ligand="substrate"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00168"
FT BINDING 211
FT /ligand="substrate"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00168"
FT BINDING 299
FT /ligand="Zn(2+)"
FT /ligand_id="ChEBI:CHEBI:29105"
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 304
FT /ligand="Zn(2+)"
FT /ligand_id="ChEBI:CHEBI:29105"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00168"
FT BINDING 330
FT /ligand="Zn(2+)"
FT /ligand_id="ChEBI:CHEBI:29105"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00168"
SQ SEQUENCE 369 AA; 41429 MW; 5E9FF9C589347DF2 CRC64;
MEFEVKKTFG KARLGVMKLH HGAVETPVFM PVGTNASVKL LTPRDLEEAG AEIILSNTFH
LMLKPGVEII KLHRGLHNFM GWKRPILTDS GGFQVFSLPK IRIDDEGVVF RSPIDGSKVF
LNPEISMEVQ IALGSDICMV FDHCPVPDAD YEEVKEATER TYRWALRSKK AFKTENQALF
GIVQGGIYPD LRRESALQLT SIGFDGYAIG GLSIGEERSL TLEMTEVTVE FLPEDKPRYF
MGGGSPELIL ELVDRGVDMF DSVFPTRIAR HGTALTWNGK LNLKASYNKR SLEPVDERCG
CYTCKNFTRS YIHHLFDRGE VLGQILLTIH NINFMISLMK EVRRSIESGT FKELKSKVVE
VYSSGGVNV
