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Nucleic Acids Research, 1983, Vol. 11, No. 23 8473-8484
© 1983

MOLECULAR BIOLOGY

Two nuclear DNA binding proteins of Dictyostelium discoideum with a high affinity for poly(dA)-poly(dT)

H. Garreau and J.G. Williams

Imperial Cancer Research Fund Mill Hill Laboratories, London NW7 1AD, UK

Received September 7, 1983. Revised November 11, 1983. Accepted November 11, 1983.

Intergenic regions of the Dictyostelium genome contain an extremely high proportion of AT base pairs. Those intergenic regions which have been subjected to nucleotide sequence analysis are predominantly composed of alternating runs of poly(dA) and poly(dT) and there is evidence to suggest that nucleosomes do not form on such sequences. We have identified two nuclear proteins, of molecular weight 70,000 and 74,000 daltons, which bind only to intergenic regions of a cloned Dictyostelium gene. Binding is specifically inhibited in the presence of synthetic poly(dA) - poly(dT) as competitor. These proteins may play some role in the chromosomal organization of Intergenic regions in Dictyostelium discoideum.


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