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M94A0128.TXT
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1994-10-01
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Document 0128
DOCN M94A0128
TI Folding of the multidomain human immunodeficiency virus type-I
integrase.
DT 9412
AU Grandgenett DP; Goodarzi G; Institute for Molecular Virology, St. Louis
University, Missouri; 63110.
SO Protein Sci. 1994 Jun;3(6):888-97. Unique Identifier : AIDSLINE
MED/94348418
AB Protein folding conditions were established for human immunodeficiency
virus integrase (IN) obtained from purified bacterial inclusion bodies.
IN was denatured by 6 M guanidine.HCl-5 mM dithiothreitol, purified by
gel filtration, and precipitated by ammonium sulfate. The reversible
solvation of precipitated IN by 6 M guanidine.HCl allowed for wide
variation of protein concentration in the folding reaction. A 6-fold
dilution of denatured IN by 1 M NaCl buffer followed by dialysis
produced enzymatically active IN capable of 3' OH end processing, strand
transfer, and disintegration using various human immunodeficiency
virus-1 (HIV-1) long terminal repeat DNA substrates. The specific
activities of folded IN preparations for these enzymatic reactions were
comparable to those of soluble IN purified directly from bacteria. The
subunit composition and enzymatic activities of IN were affected by the
folding conditions. Standard folding conditions were defined in which
monomers and protein aggregates sedimenting as dimers and tetramers wree
produced. These protein aggregates were enzymatically active, whereas
monomers had reduced strand transfer activity. Temperature modifications
of the folding conditions permitted formation of mainly monomers. Upon
assaying, these monomers were efficient for strand transfer and
disintegration, but the oligomeric state of IN under the conditions of
the assay is determinate. Our results suggest that monomers of the
multidomain HIV-1 IN are folded correctly for various catalytic
activities, but the conditions for specific oligomerization in the
absence of catalytic activity are undefined.
DE Ammonium Sulfate Blotting, Western Chromatography, Gel Dithiothreitol
DNA Nucleotidyltransferases/*CHEMISTRY/METABOLISM DNA, Viral/METABOLISM
Enzyme Stability Freezing Guanidines Heat HIV Long Terminal Repeat
HIV-1/*ENZYMOLOGY Precipitation Protein Denaturation *Protein Folding
Recombinant Proteins/CHEMISTRY/METABOLISM 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).