Stimulation of the DNA-dependent protein kinase by RNA polymerase II transcriptional activator proteins - PubMed (original) (raw)
. 1995 Jan 20;270(3):1449-54.
doi: 10.1074/jbc.270.3.1449.
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- PMID: 7836414
- DOI: 10.1074/jbc.270.3.1449
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Stimulation of the DNA-dependent protein kinase by RNA polymerase II transcriptional activator proteins
S R Peterson et al. J Biol Chem. 1995.
Free article
Abstract
The DNA-dependent protein kinase (DNA-PK) phosphorylates RNA polymerase II and a number of transcription factors. We now show that the activity of DNA-PK is directly stimulated by certain transcriptional activator proteins, including the human heat shock transcription factor 1 (HSF1) and a transcriptionally active N-terminal 147 amino acid GAL4 derivative. Stimulation of DNA-PK activity required specific sequences in the activator proteins outside the minimal DNA binding domains. The stimulation of DNA-PK activity also required DNA and was greater with DNA containing relevant activator binding sites. Comparison of different HSF binding fragments showed that optimal stimulation occurred when two HSF binding sites were present. Stimulation with HSF and GAL4 was synergistic with Ku protein, another regulator of DNA-PK activity. DNA-PK is tightly associated with the transcriptional template, and an increase in its activity could potentially influence transcription through the phosphorylation of proteins associated with the transcription complex.
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