You are not currently logged in.
Access JSTOR through your library or other institution:
If You Use a Screen ReaderThis content is available through Read Online (Free) program, which relies on page scans. Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
In vitro Core Particle and Nucleosome Assembly at Physiological Ionic Strength
Adolfo Ruiz-Carrillo, José L. Jorcano, Gabi Eder and Rudolf Lurz
Proceedings of the National Academy of Sciences of the United States of America
Vol. 76, No. 7 (Jul., 1979), pp. 3284-3288
Published by: National Academy of Sciences
Stable URL: http://www.jstor.org/stable/69975
Page Count: 5
You can always find the topics here!Topics: DNA, Histones, Nucleosomes, Dimers, Oligomers, Biochemistry, Chromatin, Erythrocytes, Nucleic acids, Ungulates
Were these topics helpful?See something inaccurate? Let us know!
Select the topics that are inaccurate.
Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Preview not available
Nucleosome core particles have been efficiently assembled in vitro by direct interaction of histones and DNA at physiological ionic strength, as assayed by digestion with DNases, supercoiling of relaxed circular DNA, and electron microscopy. Reconstitution was achieved either by the simultaneous addition of all core histones, or by the sequential binding of H3· H4 tetramer and H2A· H2B dimer to DNA. Micrococcal nuclease digestion and electron microscopy studies indicated that there is heterogeneity in the spacings at which core particles are assembled on the DNA. Length measurements of oligomeric DNA produced during the course of the digestion suggest that the core histone octamer can organize 167 (± 4) rather than 145 base pairs of DNA, the extra 20 base pairs being quickly digested. Binding of histone H1 to core particles resulted in the protection of about 165 base pairs of DNA from nuclease attack. Because the core histone octamer is fully dissociated into H3· H4 tetramer and H2A· H2B dimer at physiological ionic strength, our results would suggest that in vivo core particle assembly may also occur by interaction of these two complexes on the nascent DNA.
Proceedings of the National Academy of Sciences of the United States of America © 1979 National Academy of Sciences