TGT_XENTR
ID TGT_XENTR Reviewed; 396 AA.
AC Q28HC6; Q6P625;
DT 22-SEP-2009, integrated into UniProtKB/Swiss-Prot.
DT 22-SEP-2009, sequence version 2.
DT 03-AUG-2022, entry version 84.
DE RecName: Full=Queuine tRNA-ribosyltransferase catalytic subunit 1 {ECO:0000255|HAMAP-Rule:MF_03218};
DE EC=2.4.2.64 {ECO:0000250|UniProtKB:Q9BXR0, ECO:0000255|HAMAP-Rule:MF_03218};
DE AltName: Full=Guanine insertion enzyme {ECO:0000255|HAMAP-Rule:MF_03218};
DE AltName: Full=tRNA-guanine transglycosylase {ECO:0000255|HAMAP-Rule:MF_03218};
GN Name=qtrt1 {ECO:0000255|HAMAP-Rule:MF_03218};
GN ORFNames=TEgg001l19.1, TGas042b06.1;
OS Xenopus tropicalis (Western clawed frog) (Silurana tropicalis).
OC Eukaryota; Metazoa; Chordata; Craniata; Vertebrata; Euteleostomi; Amphibia;
OC Batrachia; Anura; Pipoidea; Pipidae; Xenopodinae; Xenopus; Silurana.
OX NCBI_TaxID=8364;
RN [1]
RP NUCLEOTIDE SEQUENCE [LARGE SCALE MRNA].
RC TISSUE=Egg, and Gastrula;
RG Sanger Xenopus tropicalis EST/cDNA project;
RL Submitted (OCT-2006) to the EMBL/GenBank/DDBJ databases.
RN [2]
RP NUCLEOTIDE SEQUENCE [LARGE SCALE MRNA].
RC TISSUE=Embryo;
RG NIH - Xenopus Gene Collection (XGC) project;
RL Submitted (NOV-2003) to the EMBL/GenBank/DDBJ databases.
CC -!- FUNCTION: Catalytic subunit of the queuine tRNA-ribosyltransferase
CC (TGT) that catalyzes the base-exchange of a guanine (G) residue with
CC queuine (Q) at position 34 (anticodon wobble position) in tRNAs with
CC GU(N) anticodons (tRNA-Asp, -Asn, -His and -Tyr), resulting in the
CC hypermodified nucleoside queuosine (7-(((4,5-cis-dihydroxy-2-
CC cyclopenten-1-yl)amino)methyl)-7-deazaguanosine). Catalysis occurs
CC through a double-displacement mechanism. The nucleophile active site
CC attacks the C1' of nucleotide 34 to detach the guanine base from the
CC RNA, forming a covalent enzyme-RNA intermediate. The proton acceptor
CC active site deprotonates the incoming queuine, allowing a nucleophilic
CC attack on the C1' of the ribose to form the product.
CC {ECO:0000255|HAMAP-Rule:MF_03218}.
CC -!- CATALYTIC ACTIVITY:
CC Reaction=guanosine(34) in tRNA + queuine = guanine + queuosine(34) in
CC tRNA; Xref=Rhea:RHEA:16633, Rhea:RHEA-COMP:10341, Rhea:RHEA-
CC COMP:10345, ChEBI:CHEBI:16235, ChEBI:CHEBI:74269, ChEBI:CHEBI:77674,
CC ChEBI:CHEBI:82831; EC=2.4.2.64; Evidence={ECO:0000255|HAMAP-
CC Rule:MF_03218};
CC -!- COFACTOR:
CC Name=Zn(2+); Xref=ChEBI:CHEBI:29105;
CC Evidence={ECO:0000255|HAMAP-Rule:MF_03218};
CC -!- SUBUNIT: Heterodimer of a catalytic subunit qtrt1 and an accessory
CC subunit qtrt2. {ECO:0000255|HAMAP-Rule:MF_03218}.
CC -!- SUBCELLULAR LOCATION: Cytoplasm {ECO:0000255|HAMAP-Rule:MF_03218}.
CC Mitochondrion outer membrane {ECO:0000255|HAMAP-Rule:MF_03218};
CC Peripheral membrane protein {ECO:0000255|HAMAP-Rule:MF_03218};
CC Cytoplasmic side {ECO:0000255|HAMAP-Rule:MF_03218}. Note=Weakly
CC associates with mitochondria, possibly via qtrt2. {ECO:0000255|HAMAP-
CC Rule:MF_03218}.
CC -!- SIMILARITY: Belongs to the queuine tRNA-ribosyltransferase family.
CC {ECO:0000255|HAMAP-Rule:MF_03218}.
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DR EMBL; CR760939; CAJ82032.1; -; mRNA.
DR EMBL; CR926355; CAJ81982.1; -; mRNA.
DR EMBL; BC062509; AAH62509.1; -; mRNA.
DR RefSeq; NP_989090.1; NM_203759.1.
DR AlphaFoldDB; Q28HC6; -.
DR SMR; Q28HC6; -.
DR STRING; 8364.ENSXETP00000004818; -.
DR PRIDE; Q28HC6; -.
DR DNASU; 394694; -.
DR GeneID; 394694; -.
DR KEGG; xtr:394694; -.
DR CTD; 81890; -.
DR Xenbase; XB-GENE-6076185; qtrt1.
DR eggNOG; KOG3908; Eukaryota.
DR InParanoid; Q28HC6; -.
DR OrthoDB; 684306at2759; -.
DR Proteomes; UP000008143; Chromosome 3.
DR Proteomes; UP000790000; Unplaced.
DR GO; GO:0005741; C:mitochondrial outer membrane; IEA:UniProtKB-SubCell.
DR GO; GO:0046872; F:metal ion binding; IEA:UniProtKB-KW.
DR GO; GO:0046982; F:protein heterodimerization activity; ISS:UniProtKB.
DR GO; GO:0042803; F:protein homodimerization activity; ISS:UniProtKB.
DR GO; GO:0008479; F:queuine tRNA-ribosyltransferase activity; ISS:UniProtKB.
DR GO; GO:0101030; P:tRNA-guanine transglycosylation; IBA:GO_Central.
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 2: Evidence at transcript level;
KW Cytoplasm; Glycosyltransferase; Membrane; Metal-binding; Mitochondrion;
KW Mitochondrion outer membrane; Reference proteome; Transferase;
KW tRNA processing; Zinc.
FT CHAIN 1..396
FT /note="Queuine tRNA-ribosyltransferase catalytic subunit 1"
FT /id="PRO_0000383949"
FT REGION 254..260
FT /note="RNA binding"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_03218"
FT REGION 278..282
FT /note="RNA binding; important for wobble base 34
FT recognition"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_03218"
FT ACT_SITE 99
FT /note="Proton acceptor"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_03218"
FT ACT_SITE 273
FT /note="Nucleophile"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_03218"
FT BINDING 99..103
FT /ligand="substrate"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_03218"
FT BINDING 153
FT /ligand="substrate"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_03218"
FT BINDING 196
FT /ligand="substrate"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_03218"
FT BINDING 223
FT /ligand="substrate"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_03218"
FT BINDING 311
FT /ligand="Zn(2+)"
FT /ligand_id="ChEBI:CHEBI:29105"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_03218"
FT BINDING 313
FT /ligand="Zn(2+)"
FT /ligand_id="ChEBI:CHEBI:29105"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_03218"
FT BINDING 316
FT /ligand="Zn(2+)"
FT /ligand_id="ChEBI:CHEBI:29105"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_03218"
FT BINDING 341
FT /ligand="Zn(2+)"
FT /ligand_id="ChEBI:CHEBI:29105"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_03218"
FT CONFLICT 94
FT /note="R -> K (in Ref. 1; CAJ82032)"
FT /evidence="ECO:0000305"
FT CONFLICT 394
FT /note="T -> A (in Ref. 1; CAJ82032)"
FT /evidence="ECO:0000305"
SQ SEQUENCE 396 AA; 44310 MW; 403946A11F609001 CRC64;
MAAPQCHALV HRVLAECPVT KARACEFRLP HGPVKTPVFM PVGTQGTMKG VTADQLRNLG
CEICLGNTYH LGMRPGPEIM KKAGGLHGFM NWGRNLLTDS GGFQMVSLVE LSKVTEEGVQ
FRSPYDGKEI LLTPEKSIEI QNALGSDIMM QLDDVVSSTI TGPRVEEAMH RSIRWLDRCI
AANSNPDRQN LFAIIQGGLD AELRRKCLQE MTKRDVPGFA IGGLSGGEEK DHFWRMVTLS
TDHLPRDKPR YLMGVGYATD LVVCVALGCD MFDCVFPTRT ARFGSALVPW GSLQLKNKQF
AKDFQPIDKN CDCPTCQRYS RAYINALFKS DTAAMHHITI HNIAYQLNLM RSVRDSILQG
RFPQFVQDFM RTMYSSRDKY PQWAVDALET VGITLQ
