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. 1992 Jul 15;89(14):6252–6256. doi: 10.1073/pnas.89.14.6252

Complexity of sea urchin embryo nuclear proteins that contain basic domains.

M G Harrington 1, J A Coffman 1, F J Calzone 1, L E Hood 1, R J Britten 1, E H Davidson 1
PMCID: PMC49478  PMID: 1631117

Abstract

We describe a quantitative two-dimensional gel electrophoretic analysis of nuclear extract from 24-hr sea urchin embryos. The extract was fractionated by using a weak cation-exchange resin, and eight known DNA-binding proteins were shown to be entirely included in a salt eluate that releases proteins containing basic domains. This fraction and a lower-salt fraction containing the majority of the protein species were mapped two-dimensionally by using new algorithms that permit reproducible spot identification, storage of intensity and map-position data, and subtractive comparison of one pattern with respect to another. By reference to a previously characterized DNA-binding factor, spot intensity could be interpreted in terms of the number of molecules per embryo nucleus. A map was constructed displaying all nuclear proteins containing basic domains that are present within the concentration range per nucleus of a set of known DNA-binding factors of the sea urchin embryo. The map includes 265 spots that fulfill both of these criteria, probably representing about 100 different protein species.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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