NDLI: Induction of the Z conformation in poly(dG-dC).poly(dG-dC) by binding of N-2-acetylaminofluorene to guanine residues.

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Induction of the Z conformation in poly(dG-dC).poly(dG-dC) by binding of N-2-acetylaminofluorene to guanine residues.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Rich, A. Santella, R. M. Weinstein, I. B. Grunberger, D.
Abstract	Poly(dG-dC).poly(dG-dC) and poly(dG).poly(dC) were modified by treatment with N-acetoxy-N-2-acetylaminofluorene, and their conformations were examined by circular dichroism and susceptibility to nuclease S1 digestion. A sample of poly(dG-dC).poly(dG-dC) modified to an extent of 28% with acetylaminofluorene (AAF) at the C(8) position of the deoxyguanosine residues showed a circular dichroism spectrum that had the characteristics of the Z conformation seen in unmodified poly(dG-dC).poly(dG-dC) at high ethanol or salt concentrations. A sample of poly(dG-dC).poly(dG-dC) modified only 3% by AAF showed a spectrum characteristic of the B form of DNA. However, it was converted to the Z form at ethanol concentrations lower than required to convert unmodified poly(dG-dC).poly(dG-dC) from the B to the Z form. Poly(dG).poly(dC), which does not undergo the B-to-Z transition at high ethanol concentrations, did not show any large conformational changes with high AAF modification. Susceptibility to digestion with nuclease S1 also suggested differences in the conformations of the two modified polynucleotides. Poly(dG-dC).poly(dG-dC) modified by AAF to an extent of 28% was almost completely resistant to nuclease S1 digestion. However, both poly(dG).poly(dC) and DNA modified to similar levels by AAF were highly susceptible to nuclease S1 digestion. Two different conformations for AAF-modified deoxyguanosine are proposed, depending on whether its position is in alternating purine-pyrimidine sequences or in random-sequence DNA.
ISSN	00278424
e-ISSN	10916490
Journal	Proceedings of the National Academy of Sciences of the United States of America
Issue Number	3
Volume Number	78
Language	English
Publisher	National Academy of Sciences
Publisher Date	1981-07-01
Publisher Place	United States
Access Restriction	Open
Subject Keyword	2-Acetylaminofluorene Polydeoxyribonucleotides Chemical Phenomena Chemistry Circular Dichroism Endonucleases Guanine Nucleic Acid Conformation Single-Strand Specific DNA And RNA Endonucleases Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, P.H.S. Multidisciplinary
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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