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M9620251.TXT
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1996-02-26
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Document 0251
DOCN M9620251
TI In vitro activity of minimised hammerhead ribozymes.
DT 9602
AU Hendry P; McCall MJ; Santiago FS; Jennings PA; CSIRO, Division of
Biomolecular Engineering, North Ryde, NSW,; Australia.
SO Nucleic Acids Res. 1995 Oct 11;23(19):3922-7. Unique Identifier :
AIDSLINE MED/96038849
AB A number of minimised hammerhead ribozymes (minizymes) which lack stem
II have been kinetically characterised. These minizymes display optimal
cleavage activity at temperatures around 37 degrees C. The cleavage
reactions of the minizymes are first order in hydroxide ion
concentration up to around pH 9.3 above which the cleavage rate
constants decline rapidly. The reactions show a biphasic dependence on
magnesium-ion concentration; one of the interactions has an apparent
dissociation constant of around 20 mM while the other appears to be very
weak, showing no sign of saturation at 200 mM MgCl2. The minizymes are
significantly less active than comparable, full-size ribozymes when
cleaving short substrates. However, at a particular site in a
transcribed TAT gene from HIV-1, minizymes are more effective than
ribozymes.
DE Animal Base Sequence Comparative Study Drosophila
melanogaster/GENETICS DNA-Binding Proteins/GENETICS Genes, tat
Hydrogen-Ion Concentration HIV-1/GENETICS Kinetics
Magnesium/PHARMACOLOGY Molecular Sequence Data Nucleic Acid
Conformation Rats RNA, Catalytic/CHEMISTRY/*METABOLISM RNA,
Messenger/CHEMISTRY/METABOLISM Somatotropin/GENETICS Substrate
Specificity Temperature Transcription Factors/GENETICS JOURNAL
ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).