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1996-01-30
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Document 0107
DOCN M9610107
TI Functional analysis of HIV-1 Vpr: identification of determinants
essential for subcellular localization.
DT 9601
AU Mahalingam S; Collman RG; Patel M; Monken CE; Srinivasan A; Department
of Microbiology and Immunology, Jefferson Cancer; Institute, Thomas
Jefferson University, Philadelphia,; Pennsylvania 19107, USA.
SO Virology. 1995 Oct 1;212(2):331-9. Unique Identifier : AIDSLINE
MED/96010205
AB Vpr is a conserved HIV-1 auxiliary protein that localizes to the nuclear
region of cells. Vpr is also present in virions, and it is directed into
the assembling virus when coexpressed with Gag. Each of these two
localization activities may be important for Vpr function, and we
recently identified regions of Vpr that are critical for virion
incorporation. In this study we analyzed the Vpr domains involved in
subcellular localization. Immunofluorescence staining of transfected
cells showed that wild-type Vpr localized exclusively to the nuclear
region. Mutations in the N-terminal domain that were designed to disrupt
a predicted alpha-helical structure resulted in aberrant localization,
while conservative substitutions showed a wild-type pattern. A region in
the central portion of the protein also has the potential for helical
structure, and mutagenesis of two conserved amino acids in this domain
(A59, H71) impaired localization, while substitution of a third (Q65)
did not. In contrast, neither the conserved Gly and Cys at positions
75-76 nor the C-terminal basic residues (R87, K95) were necessary for
nuclear localization. In addition, two-residue insertions within and
between the two putative helices disrupted localization but insertion in
the C-terminal region did not. Thus, Vpr's subcellular localization
function depends on the two putative helical domains but is independent
of the conserved Gly-Cys motif and of specific C-terminal basic
residues.
DE Amino Acid Sequence Amino Acids/PHYSIOLOGY Cell Nucleus/*CHEMISTRY
Conserved Sequence Gene Products, vpr/*ANALYSIS/CHEMISTRY/GENETICS
Hela Cells Human HIV-1/*CHEMISTRY/GENETICS Molecular Sequence Data
Mutation Protein Structure, Secondary 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).