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Adapter protein NRBP associates with Jab1 and negatively regulates AP-1 activity

Hui Wang1, Xiaoqing Sun, Ying Luo

  • 1Department of Life Science and Biotechnology, Shanghai Jiaotong University, 1954 Huashan Road, Shanghai 200030, China.

FEBS Letters
|October 21, 2006
PubMed

Insights

Nuclear receptor binding protein (NRBP) inhibits Jun activation domain-binding protein 1 (Jab1) activity. This suggests NRBP acts as a negative regulator in gene transcription and tumor progression.

Area of Science:

  • Molecular Biology
  • Cellular Signaling
  • Oncogenesis

Background:

  • Jun activation domain-binding protein 1 (Jab1) is a coactivator of activating protein-1 (AP-1) and a component of the COP9 signalosome complex.
  • Jab1 plays critical roles in cell signaling, cellular functions, and oncogenesis through interactions with various proteins.

Purpose of the Study:

  • To investigate the interaction between Jab1 and nuclear receptor binding protein (NRBP).
  • To determine the functional consequence of NRBP on Jab1-mediated AP-1 activation.
  • To explore the potential role of NRBP as a regulator of Jab1 functions.

Main Methods:

  • In vivo interaction studies between Jab1 and NRBP.
  • Analysis of Jab1-induced c-Jun phosphorylation and AP-1 activation.
  • Overexpression studies of NRBP in mammalian cells to assess AP-1 activation.

Main Results:

  • Jab1 interacts in vivo with nuclear receptor binding protein (NRBP).
  • NRBP inhibits Jab1-induced phosphorylation of c-Jun and subsequent AP-1 activation.
  • Overexpression of NRBP specifically suppresses AP-1 activation stimulated by various factors in mammalian cells.

Conclusions:

  • NRBP interacts with Jab1 and negatively regulates its functions.
  • NRBP may serve as a crucial negative regulator of Jab1-mediated gene transcription and tumor progression.

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