PMID: 698961Nov 1, 1978Paper

Comparison between different forms of estrogen cytosol receptor and the nuclear receptor extracted by micrococcal nuclease

Cancer Research
H Rochefort, J André

Abstract

As an approach to the mechanism of the nuclear translocation of estrogen receptor, the estradiol nuclear receptor (RN) of lamb endometrium was extracted with micrococcal nuclease at 2--4 degrees and compared to the "native" 8S and to the Ca2+-transformed cytosol receptors. After extensive digestion of chromatin, giving up to 10% perchloric acid-soluble DNA and a majority of nucleosome monomers, up to 80% of the RN was extracted and under low ionic strength. This RN was found to be completely different from the partially proteolyzed Ca2+-transformed cytosol receptor. It migrated with a sedimentation constant of 4 and 6 S. The Stokes radius of the predominant form as determined by ACA 34 chromatography was 5.3 nm. The calculated apparent molecular weights were 130,000 and 90,000, respectively. The RN was able to bind DNA and was eluted from a diethylaminoethyl cellulose column at 0.23 and 0.30 M KCl. We conclude that the mechanism proposed by Puca et al., according to which the Ca2+-transformed cytosol receptor is split by a Ca2+ receptor-transforming factor into a smaller form able to cross the nuclear membrane, is very unlikely.

Related Concepts

Calcium
Cell Nucleus
Centrifugation, Density Gradient
Chromatography, DEAE-Cellulose
Molecular Sieve Chromatography
Cytoplasmic Matrix
DNA, Double-Stranded
Estradiol, (16 alpha,17 beta)-Isomer
Micrococcal Nuclease
Estrogen Nuclear Receptor

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