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M9550252.TXT
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1995-03-04
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Document 0252
DOCN M9550252
TI Intrinsic activity of human immunodeficiency virus type 1 protease
heterologous fusion proteins in mammalian cells.
DT 9505
AU Arrigo SJ; Haines JK; Huffman KM; Department of Microbiology and
Immunology, Medical University of; South Carolina, Charleston
29425-2230.
SO DNA Cell Biol. 1995 Jan;14(1):15-23. Unique Identifier : AIDSLINE
MED/95134352
AB We have generated various mammalian expression constructs that produce
fusion proteins of human immunodeficiency virus type 1 (HIV-1) protease
(PR) with the HIV-1 Nef protein. The expression of these proteins is
inducible by the HIV-1 Tat protein. High-level expression of
proteolytically active PR was produced from PR imbedded into Nef coding
sequences, flanked by PR cleavage sites. The fusion protein was cleaved
nearly to completion and did not exhibit the regulated processing that
is seen with the virally encoded PR. No cytotoxic effect of PR
expression was detected. The self-cleavage of PR could be inhibited by a
specific inhibitor of HIV-1 PR (U75875). Elimination of the
aminoterminal PR cleavage site did not have a measurable effect on
cleavage of the precursor fusion protein. The cleaved fusion proteins
appeared to be extremely unstable in the transfected cells. These
findings demonstrate the intrinsic activity of HIV-1 PR in mammalian
cells, in the context of a heterologous fusion protein.
DE Animal Base Sequence Cell Line Gene Expression Regulation, Viral
Gene Products, nef/*GENETICS Gene Products, tat/GENETICS Genetic
Vectors/GENETICS Human HIV Protease/BIOSYNTHESIS/GENETICS/*METABOLISM
HIV Protease Inhibitors/PHARMACOLOGY HIV-1/*METABOLISM Mammals
Molecular Sequence Data Protein Processing, Post-Translational/DRUG
EFFECTS Recombinant Fusion Proteins/BIOSYNTHESIS/METABOLISM/TOXICITY
RNA, Messenger/BIOSYNTHESIS Sequence Deletion/PHYSIOLOGY 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).