title: Xenopus transcription factor IIIA forms a complex of covalent character with 5S DNA.
abstract: The 5S gene-specific transcription factor TFIIIA forms an exceptionally stable complex with the internal promoter of the 5S RNA gene. Approximately 1 to 5% of TFIIIA-DNA or deoxyoligonucleotide complexes are stable to harsh denaturation conditions and can be resolved by electrophoresis in the presence of SDS. These complexes are resistant to acidic conditions (0.1 N HCl, 55 degrees C, 2h) suggesting that the interaction may be through a covalent bond. Complex formation does not result in DNA strand scission and studies of the chemical sensitivity of the complex suggest that the TFIIIA-DNA linkage may be through a phosphoramidate bond. Covalent complexes are formed with both the noncoding (RNA-like) and coding strands of the internal control region. The predominant sites of TFIIIA-DNA adducts have been mapped to the 3' end of the 5S gene internal control region, the region previously shown to exhibit essential guanine and phosphate contacts with TFIIIA.
authors.affiliation: Department of Molecular Biology, Research Institute of Scripps Clinic, La Jolla, CA 92037.
authors.forename: J
authors.initials: J
authors.lastname: Blanco
authors.forename: J M
authors.initials: JM
authors.lastname: Gottesfeld
mesh_terms: D000818:Animals; D004268:DNA-Binding Proteins / Q000235:genetics / Q000302:isolation & purification; D005785:Gene Conversion; D046911:Macromolecular Substances; D009691:Nucleic Acid Denaturation; D015345:Oligonucleotide Probes; D011401:Promoter Regions, Genetic; D012335:RNA, Ribosomal / Q000235:genetics / Q000302:isolation & purification; D012341:RNA, Ribosomal, 5S / Q000235:genetics / Q000302:isolation & purification; D012967:Sodium Dodecyl Sulfate; D035582:Transcription Factor TFIIIA; D014157:Transcription Factors / Q000302:isolation & purification; D014982:Xenopus laevis
chemical_list: D004268:DNA-Binding Proteins; D046911:Macromolecular Substances; D015345:Oligonucleotide Probes; D012335:RNA, Ribosomal; D012341:RNA, Ribosomal, 5S; D035582:Transcription Factor TFIIIA; D014157:Transcription Factors; D012967:Sodium Dodecyl Sulfate