TGT_THISH
ID TGT_THISH Reviewed; 371 AA.
AC B8GTQ4;
DT 28-JUL-2009, integrated into UniProtKB/Swiss-Prot.
DT 03-MAR-2009, sequence version 1.
DT 03-AUG-2022, entry version 66.
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=Tgr7_2068;
OS Thioalkalivibrio sulfidiphilus (strain HL-EbGR7).
OC Bacteria; Proteobacteria; Gammaproteobacteria; Chromatiales;
OC Ectothiorhodospiraceae; Thioalkalivibrio.
OX NCBI_TaxID=396588;
RN [1]
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=HL-EbGR7;
RX PubMed=21475584; DOI=10.4056/sigs.1483693;
RA Muyzer G., Sorokin D.Y., Mavromatis K., Lapidus A., Clum A., Ivanova N.,
RA Pati A., d'Haeseleer P., Woyke T., Kyrpides N.C.;
RT "Complete genome sequence of 'Thioalkalivibrio sulfidophilus' HL-EbGr7.";
RL Stand. Genomic Sci. 4:23-35(2011).
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; CP001339; ACL73148.1; -; Genomic_DNA.
DR RefSeq; WP_012638627.1; NC_011901.1.
DR AlphaFoldDB; B8GTQ4; -.
DR SMR; B8GTQ4; -.
DR STRING; 396588.Tgr7_2068; -.
DR EnsemblBacteria; ACL73148; ACL73148; Tgr7_2068.
DR KEGG; tgr:Tgr7_2068; -.
DR eggNOG; COG0343; Bacteria.
DR HOGENOM; CLU_022060_0_1_6; -.
DR OMA; GIDLFDC; -.
DR OrthoDB; 1165356at2; -.
DR UniPathway; UPA00392; -.
DR Proteomes; UP000002383; 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_1000198035"
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 89
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 89..93
FT /ligand="substrate"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00168"
FT BINDING 143
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; 41546 MW; 551917AAB804EFBD CRC64;
MKFELIANDG AARRGRLSFP RGTVETPAFM PVGTYGTVKA MTPEELEGIG AEIILGNTFH
LMLRPGTEVI QLHGDLHDFM HWEKPILTDS GGFQVFSLAD LRKITEEGVK FRSPVDGSEI
LLTPERSMDV QRALGSDIVM IFDECTPYPA TEDQARESME LSLRWAARSK VAHGDSPSAL
FGIVQGGMYP ALRSRSLEGL VDVGFDGYAI GGLSVGEGME ERHHVLDHLM PEMPAERPRY
LMGVGKPEDI VEAVRRGVDM FDCVIPTRNA RNGFLYTREG VMRIRNSRFR TDTGPIDESC
DCYTCRNYSR AYLKHLDKCN EILGARLNTI HNLHYYQTLM RELRGAIAEG RLEAWVAEFY
GRRSQAVPSV P
