GTP-cyclohydrolase I is the primary enzyme of tetrahydrobiopterin and folic acid biosynthesis. cDNA fragments of GTP-cyclohydrolase I were obtained from rainbow trout, chicken, the fungi Neurospora crassa, Phycomyces blakesleeanus and Saccharomyces cerevisiae, the cellular slime mold Dictyostelium discoideum, the phytoflagellate Euglena gracilis and the higher plant Mucuna hassjo using primers specific for conserved regions of the open reading frame and the reverse transcription polymerase chain reaction (RT-PCR) technique. A number of regions were found to be strictly conserved between unrelated eukaryotes. These regions may be essential for the function of GTP-cyclohydrolase I and are discussed with respect to the recently resolved crystal structure of the Escherichia coli enzyme.
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| Evidence ID | Analyze ID | Gene/Complex | Systematic Name/Complex Accession | Qualifier | Gene Ontology Term ID | Gene Ontology Term | Aspect | Annotation Extension | Evidence | Method | Source | Assigned On | Reference |
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| Evidence ID | Analyze ID | Gene | Gene Systematic Name | Phenotype | Experiment Type | Experiment Type Category | Mutant Information | Strain Background | Chemical | Details | Reference |
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| Evidence ID | Analyze ID | Gene | Gene Systematic Name | Disease Ontology Term | Disease Ontology Term ID | Qualifier | Evidence | Method | Source | Assigned On | Reference |
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| Evidence ID | Analyze ID | Regulator | Regulator Systematic Name | Target | Target Systematic Name | Direction | Regulation of | Happens During | Regulator Type | Direction | Regulation Of | Happens During | Method | Evidence | Strain Background | Reference |
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| Site | Modification | Modifier | Source | Reference |
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| Evidence ID | Analyze ID | Interactor | Interactor Systematic Name | Interactor | Interactor Systematic Name | Allele | Assay | Annotation | Action | Phenotype | SGA score | P-value | Source | Reference | Note |
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| Evidence ID | Analyze ID | Interactor | Interactor Systematic Name | Interactor | Interactor Systematic Name | Assay | Annotation | Action | Modification | Source | Reference | Note |
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| Complement ID | Locus ID | Gene | Species | Gene ID | Strain background | Direction | Details | Source | Reference |
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| Evidence ID | Analyze ID | Dataset | Description | Keywords | Number of Conditions | Reference |
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