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The Journal of Cell Biology, Vol 91, 135-141, Copyright © 1981 by The Rockefeller University Press

ARTICLES

Differing accessibility in chromatin of the antigenic sites of regions 1-58 and 63-125 of histone H2B

D di Padua Mathieu, CV Mura, LL Frado, CL Woodcock and BD Stollar

Experiments with antibodies induced by separated fragments 1-58 and 63- 125 of H2B histone indicated that the 1-58 portion of the molecule is much more accessible in chromatin than is the 63-125 region. In immunoabsorption and immunoelectron microscopic assays with bovine and chicken chromatins, anti-1-58 antibodies reacted with sheared or unsheared chromatin both at low ionic strength (1 mM Tris-HCl) and in 0.14 M NaCl. Anti-63-125 antibodies were bound only weakly by chromatin at low ionic strength and not at all in 0.14 M NaCl. Antibodies to whole H2B showed intermediate reactivity with chromatin in both assays. In tests of immunofluorescence with unfixed calf liver nuclei in suspension, anti-1-58 caused nucleolar as well as nucleoplasmic fluorescence, whereas anti-63-125 did not lead to detectable fluorescence; anti-H2B showed intermediate staining intensity. In control experiments, anti-H1 antibody was bound by chromatin at low ionic strength but not in 0.14 M NaCl; anti-H3 antibody was bound poorly under either condition.
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