The Cys2-His2 zinc-finger is the most widely occurring DNA-binding motif. The first structure of a zinc-finger/DNA complex revealed a fairly simple mechanism for DNA recognition suggesting that the zinc-finger might represent a candidate template for designing proteins to recognize DNA. Residues at three key positions in an alpha-helical 'reading head' play a dominant role in base-recognition and have been targets for mutagenesis experiments aimed at deriving a recognition code. Here we report the structure of a two zinc-finger DNA-binding domain from the protein Tramtrack complexed with DNA. The amino-terminal zinc-finger and its interaction with DNA illustrate several novel features. These include the use of a serine residue, which is semi-conserved and located outside the three key positions, to make a base contact. Its role in base-recognition correlates with a large, local, protein-induced deformation of the DNA helix at a flexible A-T-A sequence and may give insight into previous mutagenesis experiments. It is apparent from this structure that zinc-finger/DNA recognition is more complex than was originally perceived.
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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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