This study examines the histones pools in the nucleosol and cytosol of proliferating Friend cells. By using the conventional approach, detectable amounts of these molecules were found in both compartments; however, only H3 and H2B were identified in nucleosol, and H3, H2B and H4 in cytosol. The authenticity of each of these histones was verified by two independent methods, migration in SDS/polyacrylamide gels and peptide mapping. When the sensitivity of the approach was increased by radiolabelling with 125I, two additional proteins, migrating as H2A and H4, were observed in nucleosol. Even by this approach, however, H1 was not detected. Direct quantitative measurements of the histones in both compartments indicated that these pools are uneven and small. This was found also in experiments involving inhibition of protein synthesis by cycloheximide. Considered together, our data do not support the idea of the existence of preformed histone heterocomplexes or octamers. Instead the assembly of nucleosomes during replication occurs by a successive deposition of individual core histones.
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Research Article|
December 15 1989
The pool of histones in the nucleosol and cytosol of proliferating Friend cells is small, uneven and chasable
S Tsvetkov;
S Tsvetkov
1Institute of Molecular Biology, Bulgarian Academy of Sciences, 113 Sofia, Bulgaria
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E Ivanova;
E Ivanova
1Institute of Molecular Biology, Bulgarian Academy of Sciences, 113 Sofia, Bulgaria
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L Djondjurov
L Djondjurov
1Institute of Molecular Biology, Bulgarian Academy of Sciences, 113 Sofia, Bulgaria
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Publisher: Portland Press Ltd
Online ISSN: 1470-8728
Print ISSN: 0264-6021
© 1989 London: The Biochemical Society
1989
Biochem J (1989) 264 (3): 785–791.
Citation
S Tsvetkov, E Ivanova, L Djondjurov; The pool of histones in the nucleosol and cytosol of proliferating Friend cells is small, uneven and chasable. Biochem J 15 December 1989; 264 (3): 785–791. doi: https://doi.org/10.1042/bj2640785
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