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XB-ART-27136
Nucleic Acids Res 1988 Dec 09;1623:11267-84.
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Xenopus transcription factor IIIA forms a complex of covalent character with 5S DNA.

Blanco J , Gottesfeld JM .


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.

PubMed ID: 3205743
PMC ID: PMC339009
Article link: Nucleic Acids Res
Grant support: [+]

Species referenced: Xenopus laevis
Genes referenced: gtf3a

References [+] :
Berg, Potential metal-binding domains in nucleic acid binding proteins. 1986, Pubmed, Xenbase