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M9640648.TXT
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1996-03-04
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Document 0648
DOCN M9640648
TI Mutations of basic amino acids of NCp7 of human immunodeficiency virus
type 1 affect RNA binding in vitro.
DT 9604
AU Schmalzbauer E; Strack B; Dannull J; Guehmann S; Moelling K; Institut
fur Medizinische Virologie, Universitat Zurich,; Switzerland.
SO J Virol. 1996 Feb;70(2):771-7. Unique Identifier : AIDSLINE MED/96135185
AB The nucleocapsid (NC) protein of human immunodeficiency virus type 1 is
required for packaging of viral RNA and for virion assembly. It contains
two clusters of basic amino acids, consisting of five and four amino
acid residues, flanking the first of its two zinc fingers. These amino
acid residues have been mutagenized to neutral ones individually, as
well as in various combinations, by site-directed mutagenesis. Wild-type
NCp7 and the mutant proteins were expressed as recombinant proteins in
Escherichia coli, with six histidines as tags at their amino termini in
order to allow efficient purification. The purified proteins were
analyzed for RNA binding in vitro with human immunodeficiency virus type
1 5' leader RNA transcribed in vitro. Assays comprised Northwestern
blots at various salt concentrations and filter binding tests which
allowed determination of the dissociation constants of the various
mutants. The results indicated that mutations of the amino acid R-7 and
of R-32 and K-33 were more critical for RNA binding than other
mutations. Mutation of the other amino acid residues reduced the binding
affinity in proportion to the number of mutations. Mutation of seven of
the nine basic amino acid residues reduced the binding of RNA by 50- to
90-fold.
DE Amino Acid Sequence Base Sequence Blotting, Northern Blotting,
Western Capsid/GENETICS/ISOLATION & PURIF/*METABOLISM Cloning,
Molecular DNA, Viral Gene Products, gag/GENETICS/ISOLATION &
PURIF/*METABOLISM Human HIV-1/*METABOLISM Molecular Sequence Data
Mutation Recombinant Fusion Proteins/GENETICS/ISOLATION &
PURIF/METABOLISM RNA, Viral/*METABOLISM Structure-Activity
Relationship Support, Non-U.S. Gov't JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).