Enzymes
UniProtKB help_outline | 4 proteins |
Enzyme class help_outline |
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Reaction participants Show >> << Hide
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Namehelp_outline
uridine38/39 in tRNA
Identifier
RHEA-COMP:10117
Reactive part
help_outline
- Name help_outline UMP residue Identifier CHEBI:65315 Charge -1 Formula C9H10N2O8P Positionhelp_outline 38 SMILEShelp_outline C1=CC(NC(N1[C@@H]2O[C@H](COP(*)(=O)[O-])[C@H]([C@H]2O)O*)=O)=O 2D coordinates Mol file for the small molecule Search links Involved in 73 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline UMP residue Identifier CHEBI:65315 Charge -1 Formula C9H10N2O8P Positionhelp_outline 39 SMILEShelp_outline C1=CC(NC(N1[C@@H]2O[C@H](COP(*)(=O)[O-])[C@H]([C@H]2O)O*)=O)=O 2D coordinates Mol file for the small molecule Search links Involved in 73 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
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Namehelp_outline
pseudouridine38/39 in tRNA
Identifier
RHEA-COMP:10118
Reactive part
help_outline
- Name help_outline ψ-uridine residue Identifier CHEBI:65314 Charge -1 Formula C9H10N2O8P Positionhelp_outline 38 SMILEShelp_outline C=1NC(NC(C1[C@@H]2O[C@H](COP(*)(=O)[O-])[C@H]([C@H]2O)O*)=O)=O 2D coordinates Mol file for the small molecule Search links Involved in 31 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline ψ-uridine residue Identifier CHEBI:65314 Charge -1 Formula C9H10N2O8P Positionhelp_outline 39 SMILEShelp_outline C=1NC(NC(C1[C@@H]2O[C@H](COP(*)(=O)[O-])[C@H]([C@H]2O)O*)=O)=O 2D coordinates Mol file for the small molecule Search links Involved in 31 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
Cross-references
RHEA:42564 | RHEA:42565 | RHEA:42566 | RHEA:42567 | |
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Reaction direction help_outline | undefined | left-to-right | right-to-left | bidirectional |
UniProtKB help_outline |
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MetaCyc help_outline |
Related reactions help_outline
More general form(s) of this reaction
Publications
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Pseudouridine synthase 3 from mouse modifies the anticodon loop of tRNA.
Chen J., Patton J.R.
A cDNA encoding mouse pseudouridine synthase 3 (mPus3p) has been cloned. The predicted protein has 34% identity with yeast pseudouridine synthase 3 (Pus3), an enzyme known to form pseudouridine at positions 38 and 39 in yeast tRNA. The cDNA is 1.7 kb, and when used as a probe on a Northern blot of ... >> More
A cDNA encoding mouse pseudouridine synthase 3 (mPus3p) has been cloned. The predicted protein has 34% identity with yeast pseudouridine synthase 3 (Pus3), an enzyme known to form pseudouridine at positions 38 and 39 in yeast tRNA. The cDNA is 1.7 kb, and when used as a probe on a Northern blot of total RNA from mouse tissues or cells in culture, a band at 1.8 kb was observed. The open reading frame codes for a protein of 481 amino acids with a predicted molecular mass of 55 552 Da. When mPus3p was in vitro translated and used in reactions with tRNA substrates from both yeast and humans, uridines at position 39 were modified to pseudouridine. In a tRNA substrate with a uridine at position 38 (human tRNA(Leu)), there was very slight formation of pseudouridine at that position after incubation with mPus3p. << Less
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Characterization of yeast protein Deg1 as pseudouridine synthase (Pus3) catalyzing the formation of psi 38 and psi 39 in tRNA anticodon loop.
Lecointe F., Simos G., Sauer A., Hurt E.C., Motorin Y., Grosjean H.
The enzymatic activity of yeast gene product Deg1 was identified using both disrupted yeast strain and cloned recombinant protein expressed in yeast and in Escherichia coli. The results show that the DEG1-disrupted yeast strain lacks synthase activity for the formation of pseudouridines psi 38 and ... >> More
The enzymatic activity of yeast gene product Deg1 was identified using both disrupted yeast strain and cloned recombinant protein expressed in yeast and in Escherichia coli. The results show that the DEG1-disrupted yeast strain lacks synthase activity for the formation of pseudouridines psi 38 and psi 39 in tRNA whereas the other activities, specific for psi formation at positions 13, 27, 28, 32, 34, 35, 36, and 55 in tRNA, remain unaffected. Also, the His6-tagged recombinant yeast Deg1p expressed in E. coli as well as a protein fusion with protein A in yeast display the enzymatic activity only toward psi 38 and psi 39 formation in different tRNA substrates. Therefore, Deg1p is the third tRNA:pseudouridine synthase (Pus3p) characterized so far in yeast. Disruption of the DEG1 gene is not lethal but reduces considerably the yeast growth rate, especially at an elevated temperature (37 degrees C). Deg1p localizes both in the nucleus and in the cytoplasm, as shown by immunofluorescence microscopy. Identification of the pseudouridine residues present (or absent) in selected naturally occurring cytoplasmic and mitochondrial tRNAs from DEG1-disrupted strain points out a common origin of psi 38- and psi 39-synthesizing activity in both of these two cellular compartments. The sensitivity of Pus3p (Deg1p) activity to overall three-dimensional tRNA architecture and to a few individual mutations in tRNA was also studied. The results indicate the existence of subtle differences in the tRNA recognition by yeast Pus3p and by its homologous tRNA:pseudouridine synthase truA from E. coli (initially called hisT or PSU-I gene product). << Less