PIKE: A nuclear GTPase that enhances PI3Kinase activity and is regulated by protein 4.1N

Keqiang Ye, K. Joseph Hurt, Frederick Y. Wu, Ming Fang, Hongbo R. Luo, Jenny J. Hong, Seth Blackshaw, Christopher D. Ferris, Solomon H. Snyder

Research output: Contribution to journalArticlepeer-review

Abstract

While cytoplasmic Pl3Kinase (PI3K) is well characterized, regulation of nuclear PI3K has been obscure. A novel protein, PIKE (PI3Kinase Enhancer), interacts with nuclear PI3K to stimulate its lipid kinase activity. PIKE encodes a 753 amino acid nuclear GTPase. Dominant-negative PIKE prevents the NGF enhancement of PI3K and upregulation of cyclin D1. NGF treatment also leads to PIKE interactions with 4.1N, which has translocated to the nucleus, fitting with the initial identification of PIKE based on its binding 4.1N in a yeast two-hybrid screen. Overexpression of 4.1N abolishes PIKE effects on PI3K. Activation of nuclear PI3K by PIKE is inhibited by the NGF-stimulated 4.1N translocation to the nucleus. Thus, PIKE physiologically modulates the activation by NGF of nuclear PI3K.

Original languageEnglish (US)
Pages (from-to)919-930
Number of pages12
JournalCell
Volume103
Issue number6
DOIs
StatePublished - 2000

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)

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