home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
Shareware Overload Trio 2
/
Shareware Overload Trio Volume 2 (Chestnut CD-ROM).ISO
/
dir26
/
med9410p.zip
/
M94A3287.TXT
< prev
next >
Wrap
Text File
|
1994-10-25
|
3KB
|
42 lines
Document 3287
DOCN M94A3287
TI Maturation of the HIV gp160 by the Kex2p endoprotease.
DT 9412
AU Moulard M; Kieny MP; Achsterrer T; Montagnier L; Bahraoui E; Universitat
Marburg, Germany.
SO Int Conf AIDS. 1994 Aug 7-12;10(1):110 (abstract no. PA0058). Unique
Identifier : AIDSLINE ICA10/94369288
AB OBJECTIVE: To study the in vitro processing of HIV-1 envelope protein
precursor, Kex2p endoprotease from Saccaromyces cerevisiae was used as a
model. METHODS: Maturation was examined by using HIV-1 recombinant gp160
or synthetic peptides mimicking the potential cleavage sites of HIV-1,
HIV-2 and SIV. The effect of calcium on the gp160 cleavage was
investigated in the presence of the ionophore A 23187. RESULTS: The
precursor gp160 is cleaved in the HIV-1 CEM cell line preferentially in
the presence of calcium ions indicating that the responsible cellular
endoprotease is a calcium dependent enzyme. Treatment of recombinant
gp160 with Kex2p endoprotease and analysis by Western blot showed that
this precursor was cleaved into two products corresponding to the
external transmembrane and transmembrane glycoproteins. Amino acid
sequencing of the NH2 terminus of the transmembrane protein showed that
the cleavage of gp160 occured correctly between Arg511 and Arg512.
Similar results were obtained when synthetic peptides were used as
substrates. Furthermore coexpression in BHK-21 cells of Kex2p and gp160
by recombinant vaccinia viruses demonstrates that Kex2p can correctly
process the HIV-1 glycoprotein to gp120 and gp41. DISCUSSION AND
CONCLUSIONS: Kex2p endoprotease represents an interesting models to
screen drugs and inhibitors able to block the processing of HIV-1 gp 160
which represents a key step in HIV-1 viral cycle.
DE Binding Sites Calcimycin/PHARMACOLOGY Calcium/METABOLISM Cell Line
Gene Products, env/*METABOLISM Human HIV Envelope Protein
gp120/METABOLISM HIV Envelope Protein gp41/METABOLISM HIV-1/GROWTH &
DEVELOPMENT/*METABOLISM HIV-2/METABOLISM In Vitro Models, Biological
Peptides/CHEMICAL SYNTHESIS/METABOLISM Protein Precursors/*METABOLISM
Protein Processing, Post-Translational Saccharomyces
cerevisiae/ENZYMOLOGY Substrate Specificity Subtilisins/*METABOLISM
SIV/METABOLISM MEETING ABSTRACT
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).