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Identification of a novel substrate for TNFalpha-induced kinase NUAK2

Hiroyuki Yamamoto1, Seiji Takashima, Yasunori Shintani

  • 1Department of Medical Information Science, Osaka University Graduate School of Medicine, Suita, Osaka 565-0871, Japan.

Biochemical and Biophysical Research Communications
|November 21, 2007
PubMed

Insights

Tumor necrosis factor-alpha (TNFalpha) induces NUAK family, SNF1-like kinase 2 (NUAK2). Researchers identified myosin phosphatase target subunit 1 (MYPT1) as a NUAK2 substrate, revealing novel regulation of MYPT1 activity.

Area of Science:

  • Molecular biology
  • Cellular signaling
  • Biochemistry

Background:

  • Tumor necrosis factor-alpha (TNFalpha) plays critical roles in normal and tumor cells.
  • NUAK family, SNF1-like kinase 2 (NUAK2) is a TNFalpha-induced kinase involved in cell mortality.
  • The specific substrates of NUAK2 have not been previously identified.

Purpose of the Study:

  • To identify novel substrates of NUAK2.
  • To elucidate the regulatory mechanisms of NUAK2 in cellular processes.
  • To understand the interaction between TNFalpha signaling and kinase activity.

Main Methods:

  • Gene chip analysis to identify TNFalpha-induced kinases.
  • Development of a de novo screening protocol for kinase substrates.
  • In vitro kinase assays and high-performance liquid chromatography (HPLC) for substrate identification.

Main Results:

  • NUAK2 was identified as a kinase induced by TNFalpha.
  • Myosin phosphatase target subunit 1 (MYPT1) was identified as a specific substrate of NUAK2.
  • NUAK2 phosphorylates MYPT1 at sites distinct from known Rho-kinase phosphorylation sites, suggesting a novel regulatory pathway.

Conclusions:

  • NUAK2 is a novel substrate of TNFalpha signaling.
  • MYPT1 is a direct substrate of NUAK2, indicating a new mechanism for MYPT1 regulation.
  • These findings reveal a previously unknown phosphorylation and regulatory mechanism of MYPT1 activity by NUAK2.

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