TGT_DESAH
ID TGT_DESAH Reviewed; 370 AA.
AC C0QKY2;
DT 22-SEP-2009, integrated into UniProtKB/Swiss-Prot.
DT 05-MAY-2009, sequence version 1.
DT 03-AUG-2022, entry version 65.
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=HRM2_31390;
OS Desulforapulum autotrophicum (strain ATCC 43914 / DSM 3382 / VKM B-1955 /
OS HRM2) (Desulfobacterium autotrophicum).
OC Bacteria; Proteobacteria; Deltaproteobacteria; Desulfobacterales;
OC Desulfobacteraceae; Desulforapulum.
OX NCBI_TaxID=177437;
RN [1]
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=ATCC 43914 / DSM 3382 / VKM B-1955 / HRM2;
RX PubMed=19187283; DOI=10.1111/j.1462-2920.2008.01825.x;
RA Strittmatter A.W., Liesegang H., Rabus R., Decker I., Amann J., Andres S.,
RA Henne A., Fricke W.F., Martinez-Arias R., Bartels D., Goesmann A.,
RA Krause L., Puehler A., Klenk H.P., Richter M., Schuler M., Gloeckner F.O.,
RA Meyerdierks A., Gottschalk G., Amann R.;
RT "Genome sequence of Desulfobacterium autotrophicum HRM2, a marine sulfate
RT reducer oxidizing organic carbon completely to carbon dioxide.";
RL Environ. Microbiol. 11:1038-1055(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; CP001087; ACN16222.1; -; Genomic_DNA.
DR RefSeq; WP_015904984.1; NC_012108.1.
DR AlphaFoldDB; C0QKY2; -.
DR SMR; C0QKY2; -.
DR STRING; 177437.HRM2_31390; -.
DR EnsemblBacteria; ACN16222; ACN16222; HRM2_31390.
DR KEGG; dat:HRM2_31390; -.
DR eggNOG; COG0343; Bacteria.
DR HOGENOM; CLU_022060_0_1_7; -.
DR OMA; GIDLFDC; -.
DR OrthoDB; 1165356at2; -.
DR UniPathway; UPA00392; -.
DR Proteomes; UP000000442; 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..370
FT /note="Queuine tRNA-ribosyltransferase"
FT /id="PRO_1000203650"
FT REGION 248..254
FT /note="RNA binding"
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 336
FT /ligand="Zn(2+)"
FT /ligand_id="ChEBI:CHEBI:29105"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00168"
SQ SEQUENCE 370 AA; 41833 MW; FA2082C31024D17B CRC64;
MLTFDIINQS LESRARTGRI TTAHGVIETP IFMPVGTLGT VKAVSVEELK ACQAQIILGN
TYHLYLRPGC EVMAHMGGLH PFMNWDRPIL TDSGGFQFFS LAKLAKFKDE GVSFQSHIDG
SRHLFTPERA VEIQSILGSD IMMSLDWCMG YPATRKEAMG ALEKTTQWAE RGRNFWIEQG
RVNNLFGIVQ GGMFADLRSI SARQLADLDF PGYAIGGLSV GEPTELMYEM ADHTVPQLPL
EKPKYVMGVG TPENLVELAG MGVDMFDCVM PSRNARNGQL FTSTGTMNIS NAAFRLDESP
LDAECSCYTC QNYSRAYLRH LYKSRELLAY RLNTIHNLHY YLDLMHQMRN AINQGRFMAF
KQEFYRKRER
