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J. Virol., Feb 1996, 697-704, Vol 70, No. 2
M Bouhamdan, S Benichou, F Rey, JM Navarro, I Agostini, B Spire, J Camonis, G Slupphaug, R Vigne, R Benarous and J Sire
The role of the accessory gene product Vpr during human immunodeficiency
virus type 1 infection remains unclear. We have used the yeast two-hybrid
system to identify cellular proteins that interact with Vpr and could be
involved in its function. A cDNA clone which encodes the human uracil DNA
glycosylase (UNG), a DNA repair enzyme involved in removal of uracil in
DNA, has been isolated. Interaction between Vpr and UNG has been
demonstrated by in vitro protein-protein binding assays using translated,
radiolabeled Vpr and UNG recombinant proteins expressed as a glutathione
S-transferase fusion protein. Conversely, purified UNG has been
demonstrated to interact with Vpr recombinant protein expressed as a
glutathione S-transferase fusion protein. Coimmunoprecipitation experiments
confirmed that Vpr and UNG are associated within cells expressing Vpr. By
using a panel of C- and N-terminally deleted Vpr mutants, we have
determined that the core protein of Vpr, spanning amino acids 15 to 77, is
involved in the interaction with UNG. We also demonstrate by in vitro
experiments that the enzymatic activity of UNG is retained upon interaction
with Vpr.
Copyright © 1996, American Society for Microbiology
Human immunodeficiency virus type 1 Vpr protein binds to the uracil DNA glycosylase DNA repair enzyme
INSERM U372, 13276 Marseille, France.
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