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M9630625.TXT
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1996-02-27
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Document 0625
DOCN M9630625
TI Analysis of trafficking of Rev and transdominant Rev proteins in living
cells using green fluorescent protein fusions: transdominant Rev blocks
the export of Rev from the nucleus to the cytoplasm.
DT 9603
AU Stauber R; Gaitanaris GA; Pavlakis GN; Human Retrovirus Section,
NCI-FCRDC, Maryland 21702-1201, USA.
SO Virology. 1995 Nov 10;213(2):439-49. Unique Identifier : AIDSLINE
MED/96074519
AB Expression of gag/pol and env genes of human immunodeficiency virus
requires the viral Rev protein. Mutant Rev proteins, displaying a
transdominant phenotype (TDRev), were shown to inhibit Rev function. To
investigate the underlying mechanism of this inhibition, the green
fluorescent protein (GFP) of Aequorea victoria was fused to Rev and
TDRev, which allowed the study of their trafficking and interactions in
living human cells. Both Rev-GFP and TDRev-GFP were shown to retain
appropriate nucleolar localization and function. Upon actinomycin D
treatment, Rev-GFP was transported to the cytoplasm within 1.5 hr, while
TDRev, although partially dissociated from the nucleolus, was retained
in the nucleus. Coexpression of Rev-GFP and TDRev in the same cell
demonstrated that TDRev inhibited the transport of Rev-GFP from the
nucleus to the cytoplasm. This inhibition was specific for Rev, since
the export of the functionally analogous Rex protein of the human T-cell
leukemia virus type I was not inhibited by TDRev. These results indicate
that Rev and TDRev form heteromultimers in the nucleolus and that this
interaction prevents Rev's export from the nucleus to the cytoplasm. In
addition to providing a model for the function of TDRev, these results
also demonstrate the successful application of protein fusions to GFP to
study localization and trafficking of proteins in living mammalian
cells.
DE Base Sequence Biological Transport Cell Line, Transformed Cell
Nucleolus/METABOLISM Cell Nucleus/*METABOLISM Cytoplasm/*METABOLISM
Dactinomycin/PHARMACOLOGY DNA Primers Gene Products,
rev/GENETICS/*METABOLISM Gene Products, rex/METABOLISM Hela Cells
Human HIV Core Protein p24/BIOSYNTHESIS HIV-1/*METABOLISM Luminescent
Proteins/GENETICS/METABOLISM Molecular Sequence Data Phenotype
Recombinant Fusion Proteins/METABOLISM Support, Non-U.S. Gov't
Support, U.S. Gov't, P.H.S. JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).