1. Academic Validation
  2. Rack1 binds HIV-1 Nef and can act as a Nef-protein kinase C adaptor

Rack1 binds HIV-1 Nef and can act as a Nef-protein kinase C adaptor

  • Virology. 2001 Apr 25;283(1):7-18. doi: 10.1006/viro.2001.0855.
A Gallina 1 F Rossi G Milanesi
Affiliations

Affiliation

  • 1 Department of Medicine and Surgery, Polo Universitario Ospedale San Paolo, University of Milano, via A. di Rudiní 8, I-20142 Milan, Italy.
Abstract

Nef proteins of primate immunodeficiency viruses exert pleiotropic effects, such as enhanced endocytosis of CD4 and MHC-I cell surface molecules, perturbation of signal transduction cascades, and virion infectivity enhancement. Nef function intersects that of a number of cell kinases, including C kinases (PKCs) and Src-family kinases. Here the interaction of HIV-1 Nef with Rack1 (receptor for activated C kinase 1) is reported. Nef binds the Rack1 C-terminal moiety in a yeast two-hybrid system and in cell-free pull-down assays and copurifies with in vitro translated Rack1. Nef and Rack1 partially colocalize on the trans-Golgi network and plasma membranes. The presence of Rack1 doubles Nef phosphorylation by PKCs in vitro. Our data agree with the idea that Rack1 acts as a Nef intracellular docking site, bringing Nef and PKCs together. Other signal transduction or endocytosis proteins, in particular Src-like kinases, might meet Nef by intermediation of the Rack1 adaptor.

Figures