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1994-08-09
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Document 0175
DOCN M9480175
TI Three-dimensional 1H NMR structure of the nucleocapsid protein NCp10 of
Moloney murine leukemia virus.
DT 9410
AU Demene H; Jullian N; Morellet N; de Rocquigny H; Cornille F; Maigret B;
Roques BP; Departemente de Pharmacochimie Moleculaire et Structurale,
U266; INSERM-URA D 1500 CNRS, Faculte de Pharmacie, Paris, France.
SO J Biomol NMR. 1994 Mar;4(2):153-70. Unique Identifier : AIDSLINE
MED/94289983
AB The nucleocapsid protein of Moloney murine leukemia virus (NCp10) is a
56-amino acid protein which contains one zinc finger of the
CysX2CysX4HisX4Cys form, a highly conserved motif present in most
retroviruses and retroelements. At pH > or = 5, NCp10 binds one zinc
atom and the complexation induces a folding of the CysX2CysX4HEsX4Cys
box, similar to that observed for the zinc-binding domains of HIV-1 NC
protein. The three-dimensional structure of NCp10 has been determined in
aqueous solution by 600 MHz 1H NMR spectroscopy. The proton resonances
could be almost completely assigned by means of phase-sensitive
double-quantum-filtered COSY, TOCSY and NOESY techniques. NOESY spectra
yielded 597 relevant structural constraints, which were used as input
for distance geometry calculations with DIANA. Further refinement was
performed by minimization with the program AMBER, which was modified by
introducing a zinc force field. The solution structure is characterized
by a well-defined central zinc finger (rmsd of 0.747 +/- 0.209 A for
backbone atoms and 1.709 +/- 0.187 A when all atoms are considered),
surrounded by flexible N- and C-terminal domains. The Tyr28, Trp35,
Lys37, Lys41 and Lys42 residues, which are essential for activity, lie
on the same face of the zinc finger, forming a bulge structure probably
involved in viral RNA binding. The significance of these structural
characteristics for the various biological functions of the protein is
discussed, taking into account the results obtained with various
mutants.
DE Amino Acid Sequence Conserved Sequence Gene Products,
gag/*CHEMISTRY/CHEMICAL SYNTHESIS Hydrogen Mathematics Models,
Molecular Molecular Sequence Data Moloney Leukemia Virus/*CHEMISTRY
Nuclear Magnetic Resonance/METHODS *Protein Conformation Support,
Non-U.S. Gov't Viral Core Proteins/*CHEMISTRY/CHEMICAL SYNTHESIS Zinc
Fingers JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).