home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
Shareware Overload Trio 2
/
Shareware Overload Trio Volume 2 (Chestnut CD-ROM).ISO
/
dir26
/
med9408a.zip
/
M9480064.TXT
< prev
next >
Wrap
Text File
|
1994-08-09
|
2KB
|
39 lines
Document 0064
DOCN M9480064
TI Reverse chemical mutagenesis: identification of the mutagenic lesions
resulting from reactive oxygen species-mediated damage to DNA.
DT 9410
AU Feig DI; Sowers LC; Loeb LA; Department of Biochemistry, University of
Washington, Seattle; 98195.
SO Proc Natl Acad Sci U S A. 1994 Jul 5;91(14):6609-13. Unique Identifier :
AIDSLINE MED/94294428
AB An understanding of the contribution of reactive oxygen species to
mutagenesis has been hampered by the vast number of different chemical
modifications they cause in DNA. Even though many of these DNA
alterations have been catalogued, the identification of specific lesions
that cause mutations has depended on testing one modification at a time.
In this study we present another approach to identify key mutagenic
lesions from a pool of oxidatively modified nucleotides. dCTP was
treated with an oxygen radical-generating system containing FeSO4, H2O2,
and ascorbic acid. The modification products were separated by
reverse-phase and anion-exchange HPLC and then incorporated by human
immunodeficiency virus reverse transcriptase into a DNA that contains a
target gene for scoring for mutations. One of the mutagenic species
isolated was identified as 5-hydroxy-2'-deoxycytidine. It is
incorporated efficiently into DNA and causes C-->T transitions in
Escherichia coli at a frequency of 2.5%, which is more mutagenic than
any previously identified oxidative DNA lesion.
DE Base Sequence Deoxycytidine/ANALOGS & DERIVATIVES/ANALYSIS
Deoxycytosine Nucleotides/*CHEMISTRY Deoxyribonucleotides/METABOLISM
*DNA Damage DNA, Bacterial/DRUG EFFECTS/GENETICS/RADIATION EFFECTS
DNA, Viral/BIOSYNTHESIS/RADIATION EFFECTS Escherichia coli/DRUG
EFFECTS/*GENETICS Gamma Rays Genes, Bacterial HIV-1/*ENZYMOLOGY
Molecular Sequence Data *Mutagenesis Mutagens/*TOXICITY
Oxidation-Reduction Phosphorus Radioisotopes Reactive Oxygen Species
Reverse Transcriptase/*METABOLISM Support, Non-U.S. Gov't 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).