ID A0A2A3XYM0_9MICC Unreviewed; 430 AA.
AC A0A2A3XYM0;
DT 20-DEC-2017, integrated into UniProtKB/TrEMBL.
DT 20-DEC-2017, sequence version 1.
DT 24-JAN-2024, entry version 26.
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 ORFNames=CIK76_08840 {ECO:0000313|EMBL:PCC28818.1};
OS Glutamicibacter sp. BW80.
OC Bacteria; Actinomycetota; Actinomycetes; Micrococcales; Micrococcaceae;
OC Glutamicibacter.
OX NCBI_TaxID=2024404 {ECO:0000313|EMBL:PCC28818.1, ECO:0000313|Proteomes:UP000218725};
RN [1] {ECO:0000313|EMBL:PCC28818.1, ECO:0000313|Proteomes:UP000218725}
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=BW80 {ECO:0000313|EMBL:PCC28818.1,
RC ECO:0000313|Proteomes:UP000218725};
RX PubMed=28644126;
RA Bonham K.S., Wolfe B.E., Dutton R.J.;
RT "Extensive horizontal gene transfer in cheese-associated bacteria.";
RL Elife 6:e22144-e22144(2017).
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 -!- COFACTOR:
CC Name=Zn(2+); Xref=ChEBI:CHEBI:29105;
CC Evidence={ECO:0000256|HAMAP-Rule:MF_00168};
CC Note=Binds 1 zinc ion per subunit. {ECO:0000256|HAMAP-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}.
CC -!- CAUTION: The sequence shown here is derived from an EMBL/GenBank/DDBJ
CC whole genome shotgun (WGS) entry which is preliminary data.
CC {ECO:0000313|EMBL:PCC28818.1}.
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DR EMBL; NRGV01000031; PCC28818.1; -; Genomic_DNA.
DR AlphaFoldDB; A0A2A3XYM0; -.
DR UniPathway; UPA00392; -.
DR Proteomes; UP000218725; Unassembled WGS sequence.
DR GO; GO:0046872; F:metal ion binding; IEA:UniProtKB-KW.
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}; Metal-binding {ECO:0000256|HAMAP-Rule:MF_00168};
KW Queuosine biosynthesis {ECO:0000256|HAMAP-Rule:MF_00168};
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}; Zinc {ECO:0000256|HAMAP-Rule:MF_00168}.
FT DOMAIN 36..419
FT /note="tRNA-guanine(15) transglycosylase-like"
FT /evidence="ECO:0000259|Pfam:PF01702"
FT REGION 322..326
FT /note="RNA binding; important for wobble base 34
FT recognition"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00168"
FT ACT_SITE 113
FT /note="Proton acceptor"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00168"
FT ACT_SITE 317
FT /note="Nucleophile"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00168"
FT BINDING 113..117
FT /ligand="substrate"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00168"
FT BINDING 193
FT /ligand="substrate"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00168"
FT BINDING 243
FT /ligand="substrate"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00168"
FT BINDING 270
FT /ligand="substrate"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00168"
FT BINDING 355
FT /ligand="Zn(2+)"
FT /ligand_id="ChEBI:CHEBI:29105"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00168"
FT BINDING 357
FT /ligand="Zn(2+)"
FT /ligand_id="ChEBI:CHEBI:29105"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00168"
FT BINDING 360
FT /ligand="Zn(2+)"
FT /ligand_id="ChEBI:CHEBI:29105"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00168"
FT BINDING 386
FT /ligand="Zn(2+)"
FT /ligand_id="ChEBI:CHEBI:29105"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00168"
SQ SEQUENCE 430 AA; 47248 MW; 0FB29D2108290EC1 CRC64;
MSEKNFNPSN PHSRQAEFGF EVGTRLTSPE GSPMLGRTGV INTPHGQIKT PAFIAVGTKA
TVKALTPVQV AELGAQAVLA NAYHLYLQPG ADILDEAGGL GKFMSWEGPT FTDSGGFQVM
SLGSGFKKVI DMKSVDQSGP DDAVAPGKER LANVDDDGVW FKSHLDGSKH RFSPEISMNV
QHQIGADIMF AFDELTTLQN SRGYQVESLE RTRLWAQRCI AEHFALTDSR AGKDYQALFG
VIQGAQYEDL RRKACQDLGA MAFDGFGIGG ALEKENLGTI VGWCSEELPE NKPRHLLGIS
EPDDIFTAIE NGADTFDCVS PTRVARNSAF YTPHGRFNLS GARYKRDFTP LVDGCSCYTC
QNFTRAYIHH LHKSKELLSH TLISIHNEHF TVSLVDSVRE AIEDGSFFEL KEKVLGEYYN
GEPDPQGLRA
//
