8omr
From Proteopedia
(Difference between revisions)
| Line 10: | Line 10: | ||
== Function == | == Function == | ||
[https://www.uniprot.org/uniprot/TGT_HUMAN TGT_HUMAN] 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).[UniProtKB:P28720][HAMAP-Rule:MF_03218]<ref>PMID:11255023</ref> <ref>PMID:20354154</ref> | [https://www.uniprot.org/uniprot/TGT_HUMAN TGT_HUMAN] 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).[UniProtKB:P28720][HAMAP-Rule:MF_03218]<ref>PMID:11255023</ref> <ref>PMID:20354154</ref> | ||
| + | |||
| + | ==See Also== | ||
| + | *[[TRNA-guanine transglycosylase 3D structures|TRNA-guanine transglycosylase 3D structures]] | ||
== References == | == References == | ||
<references/> | <references/> | ||
Current revision
Human tRNA guanine transglycosylase (TGT) bound to tRNAAsp
| |||||||||||
Categories: Homo sapiens | Large Structures | Ficner R | Neumann P | Sievers K | Susac L | Tampe R | Trowitzsch S
