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Nucleic Acids Research, 1980, Vol. 8, No. 5 943-955
© 1980

Articles

Nuclear proteins in Drosophila melanogaster cells after heat shock and their binding to homologous DNA

Falko-Günter Falkner and Harald Biessmann

Max-Planck-Institut für Virusforschung, Abteilung Physikalische Biologie Spemannstr. 35, D 74 Tübingen, GFR

Received January 24, 1980. After 5 minutes heat shock at 37°C Drosophila melanogaster Kc-cell nuclear proteins were extracted with 0.4M NaCl and compared by SDS gel electrophoresis with extracts from cells grown at 25°C. Two proteins (39 000 and 46 000) were only found in heat shock nuclei. Reconstitution with total Drosophila DNA or a DNA fragment from the heat inducible locus 87A/C covalently coupled to sepharose was performed. In the presence of calf thymus competitor DNA these proteins and also others of lower molecular weight showed preferential binding to the homologous DNA.


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