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M9550061.TXT
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1995-03-04
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Document 0061
DOCN M9550061
TI In vivo decay kinetic parameters of hammerhead ribozymes.
DT 9505
AU Sioud M; Opstad A; Zhao JQ; Levitz R; Benham C; Drlica K; Institute of
Immunology and Rheumatology, Rikshospitalet, Oslo,; Norway.
SO Nucleic Acids Res. 1994 Dec 25;22(25):5571-5. Unique Identifier :
AIDSLINE MED/95140617
AB Ribozymes offer a potentially important way to inactivate intracellular
RNA from almost any gene whose nucleotide sequence is known. Recently,
we found that hammerhead ribozymes directed against mRNA of tumour
necrosis factor alpha (TNF alpha) and its derivatives, preferentially
bind to a cellular protein(s). To better understand the effect of
different 3'-terminal hairpins on ribozyme stability as well as their
effect on the protein binding to the ribozyme, a mathematical treatment
of the decay of three TNF alpha ribozymes that differed at their 3' ends
was performed. One ribozyme contained a 3'-terminal hairpin derived from
a transcription terminator of bacteriophage T7, another contained the
same hairpin but modified to be highly enriched for G+C nucleotides, and
a third lacked a hairpin. The TNF alpha ribozyme decay had two kinetic
components. The slow component exhibited exponential decay with a half
life of approximately 250 h in all cases. The 3'-terminal hairpin has no
significant effect on this component. This slow phase accounted for
60-80% of ribozyme decay. The rapid phase also exhibited exponential
decay. For this phase, a 3'-terminal hairpin roughly doubled the
half-life (1.7-3.4). The slow phase of degradation was about three times
faster for a ribozyme directed at the integrase mRNA of human
immunodeficiency virus-1 than that seen with the TNF alpha ribozyme.
Taken together, these results suggest that the ribozyme population is
initially sensitive to degradation, with the presence of a hairpin
provides some protection, and indicate that the addition of the hairpin
to the ribozyme did not prevent the in vivo additional stabilizing
effect of the protein(s).
DE Base Sequence Cell Line Human Kinetics Molecular Sequence Data
Nucleic Acid Denaturation RNA, Catalytic/*CHEMISTRY Support, Non-U.S.
Gov't Support, U.S. Gov't, P.H.S. Transfection Tumor Necrosis
Factor/*GENETICS JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).