NDLI: Sequence context effects in DNA replication blocks induced by aflatoxin B1.

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Sequence context effects in DNA replication blocks induced by aflatoxin B1.

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Sequence context effects in DNA replication blocks induced by aflatoxin B1.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Sambamurti, K. Humayun, M. Z. Refolo, L. M. Conley, M. P. Jacobsen, J. S.
Abstract	The genotoxic effects of the potent mutagenic carcinogen aflatoxin B1 (AFB1) are believed to be mediated by its reaction with the N-7 atom of guanine residues in DNA. We have analyzed the effect of AFB1-induced chemical modification on the template function of single-stranded DNA in vitro. The experimental strategy involves the elongation of a primer on a modified template by Escherichia coli DNA polymerase I (large fragment) and analysis of the products by high-resolution gel electrophoresis. Our data show that (i) AFB1 induces specific replication blocks one nucleotide 3' to the sites of occurrence of guanine residues on template DNA; (ii) AFB1-induced replication blocks occur predominantly at sequences capable of participation in intrastrand base pairing; (iii) within the intrastrand base-paired regions there are strong sequence context effects, in accordance with the previously described [Muench, K. F., Misra, R. P. & Humayun, M. Z. (1983) Proc. Natl. Acad. Sci. USA 80, 6-10] specificity 'rules' that apply to the reaction of AFB1 with guanine residues in double-stranded DNA; (iv) there is evidence that the (7-guanyl)-AFB1 adducts as well as secondary derivatives such as the formamidopyrimidine-AFB1 act as replication blocks. In summary, these data suggest that previously observed inhibition of DNA replication and transcription by AFB1 is directly attributable to (7-guanyl)-AFB1 adducts or their secondary reaction products.
ISSN	00278424
e-ISSN	10916490
Journal	Proceedings of the National Academy of Sciences of the United States of America
Issue Number	10
Volume Number	82
Language	English
Publisher	National Academy of Sciences
Publisher Date	1985-06-01
Publisher Place	United States
Access Restriction	Open
Subject Keyword	Aflatoxins Pharmacology DNA Replication Drug Effects DNA, Single-Stranded Genetics Aflatoxin B1 Chemical Phenomena Chemistry Epoxy Compounds Hydrogen Bonding Nucleic Acid Conformation Templates, Genetic Research Support, U.S. Gov't, P.H.S. Multidisciplinary
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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