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M9550140.TXT
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1995-03-04
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Document 0140
DOCN M9550140
TI Secondary structure in solution of two anti-HIV-1 hammerhead ribozymes
as investigated by two-dimensional 1H 500 MHz NMR spectroscopy in water.
DT 9505
AU Sarma RH; Sarma MH; Rein R; Shibata M; Setlik RS; Ornstein RL; Kazim AL;
Cairo A; Tomasi TB; Institute of Biomolecular Stereodynamics, State
University of New; York at Albany 12222.
SO FEBS Lett. 1995 Jan 9;357(3):317-23. Unique Identifier : AIDSLINE
MED/95137114
AB Two hammerhead chimeric RNA/DNA ribozymes (HRz) were synthesized in pure
form. Both were 30 nucleotides long, and the sequences were such that
they could be targeted to cleave the HIV-1 gag RNA. Named HRz-W and
HRz-M, the former had its invariable core region conserved, the latter
had a uridine in the invariable region replaced by a guanine. Their
secodary structures were determined by 2D NOESY 1H 500 MHz NMR
spectroscopy in 90% water and 10% D2(0), following the imino protons.
The data show that both HRz-M and HRz-W form identical secondary
structures with stem regions consisting of continuous stacks of AT and
GT pairs. An energy minimized computer model of this stem region is
provided. The results suggest that the loss of catalytic activity that
is known to result when an invariant core residue is replaced is not
related to the secondary structure of the ribozymes in the absence of
substrate.
DE Base Sequence HIV-1/*DRUG EFFECTS Molecular Sequence Data Nuclear
Magnetic Resonance/*METHODS *Protein Structure, Secondary RNA,
Catalytic/*CHEMISTRY/PHARMACOLOGY Solutions Support, Non-U.S. Gov't
Support, U.S. Gov't, Non-P.H.S. 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).