期刊名称：Proceedings of the National Academy of Sciences
印刷版ISSN：0027-8424
电子版ISSN：1091-6490
出版年度：1976
卷号：73
期号：2
页码：505-509
DOI：10.1073/pnas.73.2.505
语种：English
出版社：The National Academy of Sciences of the United States of America
摘要：Micrococcal nuclease digestion of intact chicken erythrocyte nuclei is shown to result in the formation of core nucleoprotein particles containing about 140 base pairs of DNA. These core particles, which are almost entirely devoid of histones f1 and f2c, are derived from transient nucleoprotein particles containing an average of approximately 180 base pairs of DNA. Oligomers of these latter particles may be isolated after brief nuclease digestion. The time course of digestion of these oligomers demonstrates the existence of "spacer" regions of more accessible DNA between core particles. Redigestion of purified monomer core nucleoprotein particles gives rise to both single-strand and double-strand DNA fragment patterns similar to those resulting from digestions of chromatin in situ. This observation indicates that the core particles we isolate are representative of nucleoprotein structures existing within the nucleus.
