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. 1977 Jan;74(1):69–73. doi: 10.1073/pnas.74.1.69

Isolation of transcriptionally active chromatin from mammalian nucleoli.

B M Bombik, C H Huang, R Baserga
PMCID: PMC393198  PMID: 264695

Abstract

Nucleoli isolated from HeLa cells are functionally active but contain large amounts of RNA and proteins (RNA/DNA ratio 1:1; protein/DNA ratio 7:1). We have isolated from the nucleolus a DNA-protein complex that has the characteristics of nucleolar chromatin (RNA/DNA ratio less than 0.05:1; protein/DNA ratio 1.7:1). This nucleolar chromatin has most of the transcriptional activity of the intact nucleolus and, as assayed by circular dichroism and dye binding, has largely preserved its structure. The isolation of a transcriptionally active, fragment of chromatin, which constitutes only a small part of the total genome and codes for only one recognizable product, offers several advantages for the study of chromatin structure and function.

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Selected References

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