1PUD
TRNA-GUANINE TRANSGLYCOSYLASE
External Resource: Annotation
Domain Annotation: SCOP/SCOPe Classification SCOP-e Database Homepage
Chains | Domain Info | Class | Fold | Superfamily | Family | Domain | Species | Provenance Source (Version) |
---|---|---|---|---|---|---|---|---|
A | d1puda_ | Alpha and beta proteins (a/b) | TIM beta/alpha-barrel | tRNA-guanine transglycosylase | tRNA-guanine transglycosylase | Queosine tRNA-guanine transglycosylase | (Zymomonas mobilis ) [TaxId: 542 ], | SCOPe (2.08) |
Domain Annotation: SCOP2 Classification SCOP2 Database Homepage
Domain Annotation: ECOD Classification ECOD Database Homepage
Domain Annotation: CATH CATH Database Homepage
Chain | Domain | Class | Architecture | Topology | Homology | Provenance Source (Version) |
---|---|---|---|---|---|---|
A | 3.20.20.105 | Alpha Beta | Alpha-Beta Barrel | TIM Barrel | Queuine tRNA-ribosyltransferase-like | CATH (4.3.0) |
Protein Family Annotation Pfam Database Homepage
Chains | Accession | Name | Description | Comments | Source |
---|---|---|---|---|---|
PF01702 | Queuine tRNA-ribosyltransferase (TGT) | Queuine tRNA-ribosyltransferase | - | Family |
Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage
InterPro: Protein Family Classification InterPro Database Homepage
Chains | Accession | Name | Type |
---|---|---|---|
IPR036511 | Queuine tRNA-ribosyltransferase-like | Homologous Superfamily | |
IPR004803 | tRNA-guanine transglycosylase | Family | |
IPR050076 | Archaeosine Synthase Type 1/Queuine TRNA-Ribosyltransferase | Family | |
IPR002616 | tRNA-guanine(15) transglycosylase-like | Domain |
Structure Motif Annotation: Mechanism and Catalytic Site Atlas M-CSA Database Homepage
Chains | Enzyme Name | Description | Catalytic Residues |
---|---|---|---|
tRNA-guanine transglycosylase M-CSA #881 | A variety of modified bases are found in RNAs and around 1 % of the Escherichia coli genome codes for proteins involved in tRNA modification. The hypermodified base quenine, a 7-deazaguanine derivative, replaces guanine-34 at the wobble position of tRNAs specific for Asn, Asp, His and Tyr. In vitro and in vivo studies showed that quenine in tRNAs affects codon selection and prevents stop codon readthrough of tobacco mosaic virus RNA in a codon context-dependent manner. However, its general function remains not very well understood [PMID:8654383]. Quenine is synthesised de novo in prokaryotes, whereas it is a nutrient for eukaryotes. In prokaryotes, the quenine biosynthesis requires several steps, not all of them yet known [PMID:8654383]. The biosynthesis begins outside of the tRNA with the conversion of GTP to the quenine precursor 7-aminomethyl-7-deazaguanine (preQ1). tRNA-guanine transglycosylase (TGT) replaces the guanine-34 at the wobble position of the cognate tRNAs with preQ1. tRNA-preQ1 is modified further by the S-adenosylmethionine-requiring enzyme QueA and an unknown vitamin B12-dependent enzyme leading to quenine [PMID:8654383]. | Defined by 6 residues: ASP:A-102ASP:A-280CYS:A-318CYS:A-320CYS:A-323HIS:A-349 | EC: 2.4.2.29 (PDB Primary Data) |