FUNCTION: Catalytic subunit of the queuine tRNA-ribosyltransferase (TGT) that catalyzes the base-exchange of a guanine (G) residue with queuine (Q) at position 34 (anticodon wobble position) in tRNAs with GU(N) anticodons (tRNA-Asp, -Asn, -His and -Tyr), resulting in the hypermodified nucleoside que...
FUNCTION: Catalytic subunit of the queuine tRNA-ribosyltransferase (TGT) that catalyzes the base-exchange of a guanine (G) residue with queuine (Q) at position 34 (anticodon wobble position) in tRNAs with GU(N) anticodons (tRNA-Asp, -Asn, -His and -Tyr), resulting in the hypermodified nucleoside queuosine (7-(((4,5-cis-dihydroxy-2-cyclopenten-1-yl)amino)methyl)-7-deazaguanosine) (PubMed:11255023, PubMed:20354154). Catalysis occurs through a double-displacement mechanism. The nucleophile active site attacks the C1' of nucleotide 34 to detach the guanine base from the RNA, forming a covalent enzyme-RNA intermediate. The proton acceptor active site deprotonates the incoming queuine, allowing a nucleophilic attack on the C1' of the ribose to form the product (By similarity). {ECO:0000250|UniProtKB:P28720, ECO:0000255|HAMAP-Rule:MF_03218, ECO:0000269|PubMed:11255023, ECO:0000269|PubMed:20354154}.
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GO - Biological processes (BP):
tRNA-guanine transglycosylation [GO:0101030]; tRNA modification [GO:0006400]...
tRNA-guanine transglycosylation [GO:0101030]; tRNA modification [GO:0006400]
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GO - Molecular function (MF):
metal ion binding [GO:0046872]; protein heterodimerization activity [GO:0046982]; protein homodimerization activity [GO:0042803]; queuine tRNA-ribosyltransferase activity [GO:0008479]...
metal ion binding [GO:0046872]; protein heterodimerization activity [GO:0046982]; protein homodimerization activity [GO:0042803]; queuine tRNA-ribosyltransferase activity [GO:0008479]
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GO - Cellular component (CC):
mitochondrial outer membrane [GO:0005741]; nucleus [GO:0005634]; protein-containing complex [GO:0032991]; transferase complex [GO:1990234]...
mitochondrial outer membrane [GO:0005741]; nucleus [GO:0005634]; protein-containing complex [GO:0032991]; transferase complex [GO:1990234]
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