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. 1985 Nov 15;260(26):14311-8.

D1 protein of Drosophila melanogaster. Purification and AT-DNA binding properties

  • PMID: 2997203
Free article

D1 protein of Drosophila melanogaster. Purification and AT-DNA binding properties

L F Levinger. J Biol Chem. .
Free article

Abstract

D1 protein of Drosophila melanogaster is a sequence-specific DNA-binding protein which recognizes AT-rich DNA sequences. AT-rich DNA sequences in eukaryotic organisms are distributed in two characteristic ways: flanking transcriptional units and in constitutive heterochromatin. D1 could play a role in regulation of gene expression and in geographical localization of DNA sequences within the nucleus. D1 has been partially purified by ion exchange chromatography. DNA-binding activity was investigated by nucleoprotein gel electrophoresis, using end-labeled restriction fragments varying in AT sequence content. D1 binds most tightly to the satellite sequence -AATAT-, with intermediate strength to the complex satellite (359-base pair repeat) and another AT-rich (68% AT) mixed sequence DNA, and least to the simple satellite sequence -AAGAG-.

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