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M9640697.TXT
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1996-03-04
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Document 0697
DOCN M9640697
TI Calreticulin interacts with newly synthesized human immunodeficiency
virus type 1 envelope glycoprotein, suggesting a chaperone function
similar to that of calnexin.
DT 9604
AU Otteken A; Moss B; Laboratory of Viral Diseases, NIAID, National
Institutes of; Health, Bethesda, Maryland 20892, USA.
SO J Biol Chem. 1996 Jan 5;271(1):97-103. Unique Identifier : AIDSLINE
MED/96132888
AB The ubiquitous eukaryotic protein calreticulin has been detected in a
wide variety of different cell types. Recently, calreticulin was found
to bind in vitro to a number of proteins isolated from the endoplasmic
reticulum. In addition, calreticulin has sequence similarities with the
molecular chaperone calnexin. These data suggest that calreticulin might
also act as a chaperone. We found that calreticulin associated
transiently with a large number of newly synthesized cellular proteins.
In cells expressing recombinant human immunodeficiency virus (HIV)
envelope glycoprotein, gp160 bound transiently to calreticulin with a
peak at 10 min after its synthesis. Binding of gp120 to calreticulin was
not detected because proteolytic cleavage of gp160 occurs in the
trans-Golgi. Nonglycosylated HIV envelope protein was not associated
with calreticulin, suggesting a requirement for N-linked
oligosaccharides on newly synthesized proteins as has been reported for
calnexin. The in vivo binding kinetics of calnexin and calreticulin to
gp160 were very similar. Sequential immunoprecipitations provided
evidence for the existence of ternary complexes of gp160, calreticulin,
and calnexin. The data suggested that most of the gp160 associated with
calreticulin was also bound to calnexin but that only a portion of the
gp160 associated with calnexin was also bound to calreticulin.
DE Adenosine Triphosphate/METABOLISM Calcium-Binding Proteins/*METABOLISM
Chaperonins/*METABOLISM Gene Products, env/*METABOLISM Glycosylation
HIV-1/*METABOLISM Kinetics Protein Binding Protein
Precursors/*METABOLISM Protein Processing, Post-Translational
Ribonucleoproteins/METABOLISM Support, Non-U.S. Gov't
Tunicamycin/PHARMACOLOGY JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).