Interaction of the regulatory subunit of the cAMP-dependent protein kinase with PATZ1 (ZNF278)

Weng Lang Yang, Roald Ravatn, Kazuya Kudoh, Leah Alabanza, Khew Voon Chin

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

The effects of cAMP in cell are predominantly mediated by the cAMP-dependent protein kinase (PKA), which is composed of two genetically distinct subunits, catalytic (C) and regulatory (R), forming a tetrameric holoenzyme R2C2. The only known function for the R subunit is that of inhibiting the activity of the C subunit kinase. It has been shown that overexpression of RIα, but not the C subunit kinase, is associated with neoplastic transformation. In addition, it has also been demonstrated that mutation in the RIα, but not the C subunit is associated with increased resistance to the DNA-damaging anticancer drug cisplatin, thus suggesting that the RIα subunit of PKA may have functions independent of the kinase. We show here that the RIα subunit interacts with a BTB/POZ domain zinc-finger transcription factor, PATZ1 (ZNF278), and co-expression with RIα results in its sequestration in the cytoplasm. The cytoplasmic/nuclear translocation is inducible by cAMP. C-terminus deletion abolishes PATZ1 interaction with RIα and results in its localization in the nucleus. PATZ1 transactivates the cMyc promoter and the presence of cAMP and co-expression with RIα modulates its transactivation. Moreover, PATZ1 is aberrantly expressed in cancer. Taken together, our results showed a potentially novel mechanism of cAMP signaling mediated through the interaction of RIα with PATZ1 that is independent of the kinase activity of PKA, and the aberrant expression of PATZ1 in cancer point to its role in cell growth regulation.

Original languageEnglish (US)
Pages (from-to)1318-1323
Number of pages6
JournalBiochemical and Biophysical Research Communications
Volume391
Issue number3
DOIs
StatePublished - Jan 15 2010
Externally publishedYes

Keywords

  • BTB-POZ
  • cAMP-dependent protein kinase
  • PATZ1
  • PRKAR1A
  • Regulatory subunit
  • ZNF278

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Molecular Biology
  • Cell Biology

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