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1994-08-27
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41 lines
Document 0703
DOCN M9480703
TI The nuclear localization signal of the matrix protein of human
immunodeficiency virus type 1 allows the establishment of infection in
macrophages and quiescent T lymphocytes.
DT 9410
AU von Schwedler U; Kornbluth RS; Trono D; Infectious Disease Laboratory,
Salk Institute for Biological; Studies, La Jolla, CA 92037-1099.
SO Proc Natl Acad Sci U S A. 1994 Jul 19;91(15):6992-6. Unique Identifier :
AIDSLINE MED/94316624
AB Lentiviruses, including human immunodeficiency virus type 1 (HIV-1), are
unusual among retroviruses in their ability to infect nondividing cells.
The matrix proteins of several lentiviruses contain a short stretch of
amino acids reminiscent of known nuclear localization signals. In HIV-1,
this motif has been shown to function as a nuclear targeting sequence
when conjugated to a heterologous protein, and to permit the active
nuclear import of the HIV-1 preintegration complex in growth-arrested
cells. In the present work, mutations were introduced in the matrix
nuclear localization region of T-cell- and macrophage-tropic HIV-1
clones. The resulting viral mutants replicated with normal or even
accelerated kinetics in dividing cells, including activated peripheral
blood lymphocytes. However, in sharp contrast with wild-type virus, the
mutants could not grow efficiently in terminally differentiated
macrophages or establish a stable and inducible infection intermediate
in unstimulated peripheral blood lymphocytes. Because macrophages
represent a major viral reservoir in vivo, and because at any given time
most T cells in the body are quiescent, these results strongly suggest
that the karyophilic properties of the matrix protein are critical for
the spread of the virus in HIV-infected individuals, and consequently
for AIDS pathogenesis.
DE Cell Division Cell Line Cell Nucleus/*METABOLISM Gene Products,
gag/GENETICS/*METABOLISM HIV Antigens/GENETICS/*METABOLISM
HIV-1/GENETICS/*PHYSIOLOGY Macrophages/CYTOLOGY/*MICROBIOLOGY
Mutagenesis Polymerase Chain Reaction Signal Peptides/*METABOLISM
Support, Non-U.S. Gov't Support, U.S. Gov't, P.H.S.
T-Lymphocytes/CYTOLOGY/*MICROBIOLOGY Virus Replication JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).