Reassembly of nucleosomal histone octamers during replication of chromatin.

Abstract:

:We have examined critically whether or not new and old histones mix in the octameric units of nucleosomes during chromatin replication. MH-134SC cells were density-labeled by culturing with amino acid mixtures enriched with dense isotopes 2H, 13C, and 15N. Mononucleosomes obtained from labeled cells were fractionated by rate zonal sedimentation through a sucrose gradient in heavy water (Senshu et al. (1985) Eur J. Biochem. 150, 575-580). The fractionation can be performed under conditions that do not destabilize nucleosomes. Density-labeling yielded heterogeneous mononucleosome species which showed higher sedimentation rates than normal mononucleosomes. However, they were indistinguishable with respect to their protein compositions, electrophoretic mobilities, electrophoretic patterns of single-stranded DNA fragments liberated by DNase I digestion, electrophoretic mobilities and sedimentation velocities of the DNA moieties, and metabolic stabilities of the histone moieties. These data suggest that the heterogeneity of density-labeled mononucleosomes resulted from the formation of histone octamers density-substituted to different degrees. This would be an inevitable consequence of mixing of new and old histones in the octameric unit of nucleosomes.

journal_name

J Biochem

journal_title

Journal of biochemistry

authors

Yamasu K,Senshu T

doi

10.1093/oxfordjournals.jbchem.a121946

subject

Has Abstract

pub_date

1987-04-01 00:00:00

pages

1041-9

issue

4

eissn

0021-924X

issn

1756-2651

journal_volume

101

pub_type

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