| 别名 |
ArcTGT, guanine insertion enzyme, guanine, queuine-tRNA transglycosylase, Q-insertase, QTRT1, QTRTD1, QueTGT, queuine insertase, queuine tRNA ribosyltransferase, queuine tRNA-ribosyltransferase, queuine tRNA-ribosyltransferase 1, queuine tRNA-ribosyltransferase domain-containing 1, ribosyltransferase, queuine transfer ribonucleate, TGT, transfer ribonucleate glycosyltransferase, tRNA guanine transglycosidase, tRNA guanine transglycosylase, tRNA transglycosylase, tRNA-guanine 34 transglycosylase, tRNA-guanine transglycosidase, tRNA-guanine transglycosylase, tRNA-guanine transglycosylases, tRNA¨Cguanine transglycosylase, virulence-associated protein VACC |
| Comments |
Certain prokaryotic and eukaryotic tRNAs contain the modified base queuine at position 34. In eukaryotes queuine is salvaged from food and incorporated into tRNA directly via a base-exchange reaction, replacing guanine. In eubacteria, which produce queuine de novo, the enzyme catalyses the exchange of guanine with the queuine precursor preQ1, which is ultimately modified to queuine [4,5]. The eubacterial enzyme can also use an earlier intermediate, preQ0, to replace guanine in unmodified tRNATyr and tRNAAsn [2]. This enzyme acts after EC 1.7.1.13, preQ1 synthase, in the queuine-biosynthesis pathway. |
