The HIV-1 nef protein interferes with phosphatidylinositol 3-kinase activation 1

Andrea Graziani, Francesco Galimi, Enzo Medico, Erika Cottone, Daniela Gramaglia, Carla Boccaccio, Paolo M. Comoglio

Research output: Contribution to journalArticlepeer-review


nef is a human immunodeficiency virus (HIV) gene encoding a 27-kDa myristoylated protein with structural features of a signal transducing molecule, but whose functions are largely unknown. We studied the interactions of Nef with the signal transduction pathways triggered by the platelet-derived growth factor (PDGF) receptor. The association of phosphatidylinositol (PI) 3-kinase with the activated receptor was severely impaired by nef expression. Conversely, PDGF-induced receptor tyrosine phosphorylation, binding to phospholipase C-γ and to Ras-GAP were not modified. Microtubule-associated protein kinase activation and intracellular calcium influx in response to PDGF were either unaffected or only slightly enhanced. Nef significantly reduced the proliferative response to the growth factor, while the chemotactic response was unchanged. These data show that Nef affects selectively the PI 3-kinase signaling pathway and suggest that this interference results in some of the HIV adverse effects on host cell functions.

Original languageEnglish
Pages (from-to)6590-6593
Number of pages4
JournalJournal of Biological Chemistry
Issue number12
Publication statusPublished - Mar 22 1996

ASJC Scopus subject areas

  • Biochemistry


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