ID A0A172U231_9BACT Unreviewed; 379 AA.
AC A0A172U231;
DT 07-SEP-2016, integrated into UniProtKB/TrEMBL.
DT 07-SEP-2016, sequence version 1.
DT 24-JAN-2024, entry version 36.
DE RecName: Full=Queuine tRNA-ribosyltransferase {ECO:0000256|HAMAP-Rule:MF_00168};
DE EC=2.4.2.29 {ECO:0000256|HAMAP-Rule:MF_00168};
DE AltName: Full=Guanine insertion enzyme {ECO:0000256|HAMAP-Rule:MF_00168};
DE AltName: Full=tRNA-guanine transglycosylase {ECO:0000256|HAMAP-Rule:MF_00168};
GN Name=tgt {ECO:0000256|HAMAP-Rule:MF_00168,
GN ECO:0000313|EMBL:ANE53395.1};
GN ORFNames=SY85_09465 {ECO:0000313|EMBL:ANE53395.1};
OS Flavisolibacter tropicus.
OC Bacteria; Bacteroidota; Chitinophagia; Chitinophagales; Chitinophagaceae;
OC Flavisolibacter.
OX NCBI_TaxID=1492898 {ECO:0000313|EMBL:ANE53395.1, ECO:0000313|Proteomes:UP000077177};
RN [1] {ECO:0000313|EMBL:ANE53395.1}
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=LCS9 {ECO:0000313|EMBL:ANE53395.1};
RX PubMed=27259556; DOI=10.1099/ijsem.0.001207;
RA Lee J.J., Kang M.S., Kim G.S., Lee C.S., Lim S., Lee J., Roh S.H., Kang H.,
RA Ha J.M., Bae S., Jung H.Y., Kim M.K.;
RT "Flavisolibacter tropicus sp. nov., isolated from tropical soil.";
RL Int. J. Syst. Evol. Microbiol. 66:3413-3419(2016).
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:0000256|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:0000256|HAMAP-
CC Rule:MF_00168};
CC -!- PATHWAY: tRNA modification; tRNA-queuosine biosynthesis.
CC {ECO:0000256|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:0000256|HAMAP-Rule:MF_00168}.
CC -!- SIMILARITY: Belongs to the queuine tRNA-ribosyltransferase family.
CC {ECO:0000256|HAMAP-Rule:MF_00168}.
CC -!- CAUTION: Lacks conserved residue(s) required for the propagation of
CC feature annotation. {ECO:0000256|HAMAP-Rule:MF_00168}.
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DR EMBL; CP011390; ANE53395.1; -; Genomic_DNA.
DR AlphaFoldDB; A0A172U231; -.
DR STRING; 1492898.SY85_09465; -.
DR KEGG; fla:SY85_09465; -.
DR PATRIC; fig|1492898.3.peg.2037; -.
DR OrthoDB; 9805417at2; -.
DR UniPathway; UPA00392; -.
DR Proteomes; UP000077177; Chromosome.
DR GO; GO:0008479; F:tRNA-guanosine(34) queuine transglycosylase 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; Queuine tRNA-ribosyltransferase-like; 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 NCBIfam; TIGR00430; Q_tRNA_tgt; 1.
DR NCBIfam; TIGR00449; tgt_general; 1.
DR PANTHER; PTHR46499; QUEUINE TRNA-RIBOSYLTRANSFERASE; 1.
DR PANTHER; PTHR46499:SF1; QUEUINE TRNA-RIBOSYLTRANSFERASE; 1.
DR Pfam; PF01702; TGT; 1.
DR SUPFAM; SSF51713; tRNA-guanine transglycosylase; 1.
PE 3: Inferred from homology;
KW Glycosyltransferase {ECO:0000256|ARBA:ARBA00022676, ECO:0000256|HAMAP-
KW Rule:MF_00168}; Queuosine biosynthesis {ECO:0000256|HAMAP-Rule:MF_00168};
KW Reference proteome {ECO:0000313|Proteomes:UP000077177};
KW Transferase {ECO:0000256|ARBA:ARBA00022679, ECO:0000256|HAMAP-
KW Rule:MF_00168};
KW tRNA processing {ECO:0000256|ARBA:ARBA00022694, ECO:0000256|HAMAP-
KW Rule:MF_00168}.
FT DOMAIN 16..372
FT /note="tRNA-guanine(15) transglycosylase-like"
FT /evidence="ECO:0000259|Pfam:PF01702"
FT REGION 255..261
FT /note="RNA binding"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00168"
FT REGION 279..283
FT /note="RNA binding; important for wobble base 34
FT recognition"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00168"
FT ACT_SITE 95
FT /note="Proton acceptor"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00168"
FT ACT_SITE 274
FT /note="Nucleophile"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00168"
FT BINDING 95..99
FT /ligand="substrate"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00168"
FT BINDING 149
FT /ligand="substrate"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00168"
FT BINDING 197
FT /ligand="substrate"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00168"
FT BINDING 224
FT /ligand="substrate"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00168"
SQ SEQUENCE 379 AA; 42688 MW; ED1CCABB5726B23C CRC64;
MPALQFQLEI TDAKSAARAG TITTDHGTIQ TPIFMPVGTI GSVKAVTQQQ LADPIKAQII
LGNTYHLYLR PGMQVMEKAG GLHQFMNWNK PILTDSGGFQ VFSLAGNRKI NEEGVMFQSH
IDGSKHLFTP EKVMDIERTI GADIMMAFDE CPPANAEYKY ALNSMNLTHR WLDRCFKHFN
ATPDKYGHTQ NLFPIVQGAV HHDLRKASCE YIASKEATGN AIGGLSVGEP EPVMYEICQL
CCENLPTQKP RYLMGVGTPW NILECIALGI DMFDCVMPTR NGRNAMLFTS KGIINIDNKK
WEYDFSPIDD GIDCEWSHYY SKSYVRHLFK ASEILGLTIA SVQNLAFYLW LVKEARKHIQ
QGDFLAWKNE MVPVLKTRL
//
