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TGT_XYLFA
ID   TGT_XYLFA               Reviewed;         384 AA.
AC   Q9PGS5;
DT   02-MAY-2002, integrated into UniProtKB/Swiss-Prot.
DT   02-MAY-2002, sequence version 2.
DT   03-AUG-2022, entry version 105.
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=XF_0223;
OS   Xylella fastidiosa (strain 9a5c).
OC   Bacteria; Proteobacteria; Gammaproteobacteria; Xanthomonadales;
OC   Xanthomonadaceae; Xylella.
OX   NCBI_TaxID=160492;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=9a5c;
RX   PubMed=10910347; DOI=10.1038/35018003;
RA   Simpson A.J.G., Reinach F.C., Arruda P., Abreu F.A., Acencio M.,
RA   Alvarenga R., Alves L.M.C., Araya J.E., Baia G.S., Baptista C.S.,
RA   Barros M.H., Bonaccorsi E.D., Bordin S., Bove J.M., Briones M.R.S.,
RA   Bueno M.R.P., Camargo A.A., Camargo L.E.A., Carraro D.M., Carrer H.,
RA   Colauto N.B., Colombo C., Costa F.F., Costa M.C.R., Costa-Neto C.M.,
RA   Coutinho L.L., Cristofani M., Dias-Neto E., Docena C., El-Dorry H.,
RA   Facincani A.P., Ferreira A.J.S., Ferreira V.C.A., Ferro J.A., Fraga J.S.,
RA   Franca S.C., Franco M.C., Frohme M., Furlan L.R., Garnier M., Goldman G.H.,
RA   Goldman M.H.S., Gomes S.L., Gruber A., Ho P.L., Hoheisel J.D.,
RA   Junqueira M.L., Kemper E.L., Kitajima J.P., Krieger J.E., Kuramae E.E.,
RA   Laigret F., Lambais M.R., Leite L.C.C., Lemos E.G.M., Lemos M.V.F.,
RA   Lopes S.A., Lopes C.R., Machado J.A., Machado M.A., Madeira A.M.B.N.,
RA   Madeira H.M.F., Marino C.L., Marques M.V., Martins E.A.L., Martins E.M.F.,
RA   Matsukuma A.Y., Menck C.F.M., Miracca E.C., Miyaki C.Y.,
RA   Monteiro-Vitorello C.B., Moon D.H., Nagai M.A., Nascimento A.L.T.O.,
RA   Netto L.E.S., Nhani A. Jr., Nobrega F.G., Nunes L.R., Oliveira M.A.,
RA   de Oliveira M.C., de Oliveira R.C., Palmieri D.A., Paris A., Peixoto B.R.,
RA   Pereira G.A.G., Pereira H.A. Jr., Pesquero J.B., Quaggio R.B.,
RA   Roberto P.G., Rodrigues V., de Rosa A.J.M., de Rosa V.E. Jr., de Sa R.G.,
RA   Santelli R.V., Sawasaki H.E., da Silva A.C.R., da Silva A.M.,
RA   da Silva F.R., Silva W.A. Jr., da Silveira J.F., Silvestri M.L.Z.,
RA   Siqueira W.J., de Souza A.A., de Souza A.P., Terenzi M.F., Truffi D.,
RA   Tsai S.M., Tsuhako M.H., Vallada H., Van Sluys M.A., Verjovski-Almeida S.,
RA   Vettore A.L., Zago M.A., Zatz M., Meidanis J., Setubal J.C.;
RT   "The genome sequence of the plant pathogen Xylella fastidiosa.";
RL   Nature 406:151-159(2000).
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}.
CC   -!- SEQUENCE CAUTION:
CC       Sequence=AAF83036.1; Type=Erroneous initiation; Evidence={ECO:0000305};
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DR   EMBL; AE003849; AAF83036.1; ALT_INIT; Genomic_DNA.
DR   PIR; G82831; G82831.
DR   RefSeq; WP_010892764.1; NC_002488.3.
DR   AlphaFoldDB; Q9PGS5; -.
DR   SMR; Q9PGS5; -.
DR   STRING; 160492.XF_0223; -.
DR   PRIDE; Q9PGS5; -.
DR   EnsemblBacteria; AAF83036; AAF83036; XF_0223.
DR   KEGG; xfa:XF_0223; -.
DR   eggNOG; COG0343; Bacteria.
DR   HOGENOM; CLU_022060_0_1_6; -.
DR   OMA; GIDLFDC; -.
DR   UniPathway; UPA00392; -.
DR   Proteomes; UP000000812; 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..384
FT                   /note="Queuine tRNA-ribosyltransferase"
FT                   /id="PRO_0000135559"
FT   REGION          248..254
FT                   /note="RNA binding"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00168"
FT   REGION          272..276
FT                   /note="RNA binding; important for wobble base 34
FT                   recognition"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00168"
FT   ACT_SITE        92
FT                   /note="Proton acceptor"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00168"
FT   ACT_SITE        267
FT                   /note="Nucleophile"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00168"
FT   BINDING         92..96
FT                   /ligand="substrate"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00168"
FT   BINDING         146
FT                   /ligand="substrate"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00168"
FT   BINDING         190
FT                   /ligand="substrate"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00168"
FT   BINDING         217
FT                   /ligand="substrate"
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         307
FT                   /ligand="Zn(2+)"
FT                   /ligand_id="ChEBI:CHEBI:29105"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00168"
FT   BINDING         310
FT                   /ligand="Zn(2+)"
FT                   /ligand_id="ChEBI:CHEBI:29105"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00168"
FT   BINDING         337
FT                   /ligand="Zn(2+)"
FT                   /ligand_id="ChEBI:CHEBI:29105"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00168"
SQ   SEQUENCE   384 AA;  41900 MW;  A1E1D0EF133B9588 CRC64;
     MSRLQFQLQA TDGAARRGQL SFPCGTVQTP AFMPVGTYGA VKGVLPGQLC DLGAEIILGN
     TFHLFLRPGL EVIADHGGLH GFMRWNGPIL TDSGGFQVFS LAHRRKISEQ GVTFAAPTDG
     AQVFLGPEES MKIQKVLNSD IVMIFDECTP YPATEDVARD SMELSLRWAQ RSRDAHDALD
     NDAALFGIIQ GGVHPDLRGR SLDGLQAIGF DGYGIGGLAV GESESERNVI LEYLHPRVPA
     DRPRYLMGVG RPEDLVESVA RGVDMFDCVM PTRHARNGQY FTGFGTVKIR NACYARDVDP
     IEPGCGCPAC VGGYTRAYLR HLDRCNEMLA SMLGTLHNLW YYETLMANMR AAITAGTFFA
     FRRSFYLARG LDLPPLPEVA GCAG
 
 
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