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TGT_BRAHW
ID   TGT_BRAHW               Reviewed;         372 AA.
AC   C0R0X6;
DT   28-JUL-2009, integrated into UniProtKB/Swiss-Prot.
DT   05-MAY-2009, sequence version 1.
DT   03-AUG-2022, entry version 68.
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=BHWA1_01285;
OS   Brachyspira hyodysenteriae (strain ATCC 49526 / WA1).
OC   Bacteria; Spirochaetes; Brachyspirales; Brachyspiraceae; Brachyspira.
OX   NCBI_TaxID=565034;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=ATCC 49526 / WA1;
RX   PubMed=19262690; DOI=10.1371/journal.pone.0004641;
RA   Bellgard M.I., Wanchanthuek P., La T., Ryan K., Moolhuijzen P.,
RA   Albertyn Z., Shaban B., Motro Y., Dunn D.S., Schibeci D., Hunter A.,
RA   Barrero R., Phillips N.D., Hampson D.J.;
RT   "Genome sequence of the pathogenic intestinal spirochete Brachyspira
RT   hyodysenteriae reveals adaptations to its lifestyle in the porcine large
RT   intestine.";
RL   PLoS ONE 4:E4641-E4641(2009).
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; CP001357; ACN83764.1; -; Genomic_DNA.
DR   RefSeq; WP_012670810.1; NC_012225.1.
DR   AlphaFoldDB; C0R0X6; -.
DR   SMR; C0R0X6; -.
DR   STRING; 565034.BHWA1_01285; -.
DR   EnsemblBacteria; ACN83764; ACN83764; BHWA1_01285.
DR   KEGG; bhy:BHWA1_01285; -.
DR   eggNOG; COG0343; Bacteria.
DR   HOGENOM; CLU_022060_0_1_12; -.
DR   OMA; GIDLFDC; -.
DR   UniPathway; UPA00392; -.
DR   Proteomes; UP000001803; 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..372
FT                   /note="Queuine tRNA-ribosyltransferase"
FT                   /id="PRO_1000197987"
FT   REGION          275..279
FT                   /note="RNA binding; important for wobble base 34
FT                   recognition"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00168"
FT   ACT_SITE        93
FT                   /note="Proton acceptor"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00168"
FT   ACT_SITE        270
FT                   /note="Nucleophile"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00168"
FT   BINDING         93..97
FT                   /ligand="substrate"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00168"
FT   BINDING         147
FT                   /ligand="substrate"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00168"
FT   BINDING         193
FT                   /ligand="substrate"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00168"
FT   BINDING         220
FT                   /ligand="substrate"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00168"
FT   BINDING         308
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         313
FT                   /ligand="Zn(2+)"
FT                   /ligand_id="ChEBI:CHEBI:29105"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00168"
FT   BINDING         339
FT                   /ligand="Zn(2+)"
FT                   /ligand_id="ChEBI:CHEBI:29105"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00168"
SQ   SEQUENCE   372 AA;  42743 MW;  650EDA400B9CE184 CRC64;
     MSFTFNVLKN SSQTSARLGK ININGIEIDT PVFMPVGTKA TVKALTPLMI EETESKIILA
     NTYHLVLKPG LEVLKKFGGV KKFMNWKGAM LTDSGGFQVF SLAKLRKIND DGVEFSSHID
     GSKYFFTPRS VMEAEHIIGA DFIMCLDECS KHDASYDYVK EAMFRTHKWA KECKEYHDST
     PNSEYQYLGG IIQGGMFDDL RKESAETLVN MDFPFYSIGG LSVGETPEQM HEVLSKVMLY
     TNKQKPRYLM GVSEPRDILN AVMEGIDMFD CVMPTRNARN GEAFTMNGIV RIRNSKYRMD
     DTVLEEDCDC YTCKNFSKAY LNHLDKTHEI LFPILMTIHN VRFMQRFMKD LRNSIENDVF
     SDYRKDMMNK FY
 
 
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