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. 1978 Feb;75(2):705-9.
doi: 10.1073/pnas.75.2.705.

Chromatin structure in the cellular slime mold Dictyostelium discoideum

A C Bakke, J R Wu, J Bonner

Chromatin structure in the cellular slime mold Dictyostelium discoideum

A C Bakke et al. Proc Natl Acad Sci U S A. 1978 Feb.

Abstract

The structure of Dictyostelium discoideum chromatin has been studied by the following techniques: electron microscopy, staphylococcal nuclease digestion, acrylamide gel electrophoresis, sucrose gradient centrifugation, and melting. The basic unit of chromatin is the nucleosome, which is a particle 98.6 A in diameter. Approximately 50% of the chromatin is protected from nuclease digestion, but this decreases when protease activity is not inhibited. The nucleosome contains 187 base pairs of DNA, including a 137-base-pair core and a 50-base-pair linker. The monomer nucleosome has an s20,w value of 11.5 S on isokinetic sucrose gradients. When the chromatin is melted, four transitions are observed, at 54.5 degrees, 66.7 degress, 74.9 degrees, and 79.7 degrees. The structure of Dictyostelium chromatin is very similar to that seen in higher eukaryotes.

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References

    1. Can J Biochem Physiol. 1959 Dec;37:1393-9 - PubMed
    1. Nature. 1953 Apr 25;171(4356):737-8 - PubMed
    1. Proc Natl Acad Sci U S A. 1977 May;74(5):2157-61 - PubMed
    1. Cell. 1976 Dec;9(4 Pt 1):605-13 - PubMed
    1. Cell. 1976 Dec;9(4 Pt 1):627-32 - PubMed

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