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cGMP-dependent protein kinase I beta physically and functionally interacts with the transcriptional regulator TFII-I.

Transcriptional regulation of the fos promoter by nitric oxide and cGMP can occur by nuclear translocation of cGMP-dependent protein kinase I (G-kinase I) (Gudi, T., Lohmann, S. M., and Pilz, R. B. (1997) Mol. Cell. Biol. 17, 5244-5254). To identify nuclear targets of G-kinase I, we performed a yeast two-hybrid screen with G-kinase I beta as bait. We found that G-kinase I beta interacted specifically with TFII-I, an unusual transcriptional regulator that associates with multiple proteins to modulate both basal and signal-induced transcription. By using purified recombinant proteins, the interaction was mapped to the N-terminal 93 amino acids of G-kinase I beta and one of six 95-amino acid repeats found in TFII-I. In baby hamster kidney cells, cGMP analogs enhanced co-immunoprecipitation of G-kinase I beta and TFII-I by inducing co-localization of both proteins in the nucleus, but in other cell types containing cytoplasmic TFII-I the G-kinase-TFII-I interaction was largely cGMP-independent. G-kinase phosphorylated TFII-I in vitro and in vivo on Ser(371) and Ser(743) outside of the interaction domain. G-kinase strongly enhanced TFII-I transactivation of a serum-response element-containing promoter in COS7 cells, and this effect was lost when Ser(371) and Ser(743) of TFII-I were mutated. TFII-I by itself had little effect on a full-length fos promoter in baby hamster kidney cells, but it synergistically enhanced transcriptional activation by G-kinase I beta. Binding of G-kinase to TFII-I may position the kinase to phosphorylate and regulate TFII-I and/or factors that interact with TFII-I at the serum-response element.

Pubmed ID: 12082086


  • Casteel DE
  • Zhuang S
  • Gudi T
  • Tang J
  • Vuica M
  • Desiderio S
  • Pilz RB


The Journal of biological chemistry

Publication Data

August 30, 2002

Associated Grants

  • Agency: NIGMS NIH HHS, Id: R01GM055586

Mesh Terms

  • Base Sequence
  • Binding Sites
  • Cloning, Molecular
  • Cyclic GMP-Dependent Protein Kinases
  • DNA Primers
  • DNA-Binding Proteins
  • Gene Expression Regulation
  • Genes, fos
  • Glutathione Transferase
  • Humans
  • Mutagenesis, Site-Directed
  • Polymerase Chain Reaction
  • Promoter Regions, Genetic
  • Recombinant Fusion Proteins
  • Recombinant Proteins
  • Saccharomyces cerevisiae
  • Transcription Factors
  • Transcription, Genetic