PIKE: A Nuclear GTPase that Enhances PI3Kinase Activity and Is Regulated by Protein 4.1N

• Published in: Cell Vol. 103; no. 6; pp. 919 - 930
• Main Authors: Ye, Keqiang, Hurt, K.Joseph, Wu, Frederick Y, Fang, Ming, Luo, Hongbo R, Hong, Jenny J, Blackshaw, Seth, Ferris, Christopher D, Snyder, Solomon H
• Format: Journal Article
• Language: English
• Published: United States Elsevier Inc 08.12.2000
• Subjects: Adenosine Triphosphate - metabolism; Amino Acid Motifs; Amino Acid Sequence; Animals; Blotting, Western; Brain Chemistry; Cell Line; Cell Nucleus - enzymology; Cyclin D1 - metabolism; Cytoskeletal Proteins - metabolism; GTP Phosphohydrolases - chemistry; GTP Phosphohydrolases - genetics; GTP Phosphohydrolases - metabolism; GTP-Binding Proteins - chemistry; GTP-Binding Proteins - genetics; GTP-Binding Proteins - metabolism; GTPase-Activating Proteins; Guanosine Triphosphate - metabolism; Humans; Immunohistochemistry; Membrane Proteins; Molecular Sequence Data; Monomeric GTP-Binding Proteins; Nerve Growth Factor - pharmacology; Neuropeptides - metabolism; PC12 Cells; Phosphatidylinositol 3-Kinases - chemistry; Phosphatidylinositol 3-Kinases - genetics; Phosphatidylinositol 3-Kinases - metabolism; Precipitin Tests; Protein Binding; ras Proteins - chemistry; ras Proteins - genetics; ras Proteins - metabolism; Rats; Transfection; Two-Hybrid System Techniques
• ISSN: 0092-8674; 1097-4172
• DOI: 10.1016/S0092-8674(00)00195-1

While cytoplasmic PI3Kinase (PI3K) is well characterized, regulation of nuclear PI3K has been obscure. A novel protein, PIKE ( PI 3 K inase E nhancer), 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.