Circularly permuted linear DNAs of approximately 100 bp were constructed containing the major adduct of the anticancer drug cisplatin, a cis-[Pt(NH3)2[d(GpG)-N7(1),-N7(2)]] intrastrand cross-link, at a specific site. Gel electrophoresis mobility shift assays with these probes were used to investigate the effects of binding of HMG domain proteins to the platinated DNAs. The site-specifically platinated duplexes were recognized by six different HMG domain proteins--HMG1, mtTFA, Ixr1, and HMG domains from HMG1 (domain B), mSRY, and LEF-1--with comparable binding affinities (Kd approximately 10(-6) to 10(-7) M). In the presence of the HMG domain proteins, the platinated DNAs were bent significantly more than in their absence, the values being 86 +/- 2 degrees, 87-90 +/- 5 degrees, and 68 +/- 6 degrees, respectively, for the proteins and 65-74 +/- 4 degrees, approximately 50 degrees, and 72 +/- 6 degrees, respectively, for the domains. The variability in bend angles suggests that, although the HMG domain proteins share a common ability to bend platinated DNA, specific contacts between the proteins and the platinated duplex are different. The assay further revealed the bend loci to be centered quite near the platinum adduct. The methodology employed in the present study should be generally applicable for synthesizing other small, circularly permuted, covalently modified DNAs which cannot otherwise be readily obtained.
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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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