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Nucleic Acids Research, 1992, Vol. 20, No. 20 5407-5412
© 1992

MOLECULAR BIOLOGY

DeoR repression at-a-distance only weakly responds to changes in interoperator separation and DNA topology

Gert Dandanell

Institute of Biological Chemistry B, University of Copenhagen Sølvgade 83, DK-1307 Copenhagen K, Denmark

Received June 25, 1992. Revised September 4, 1992. Accepted September 4, 1992.

The interoperator distance between a synthetic operator O8 and the deoP2O2-galK fusion was varied between 46 and 176 bp. The repression of the deoP2 directed galK expression as a function of the interoperator distance (center-to-center) was measured in vivo in a single-copy system. The results show that the DeoR repressor efficiently can repress transcription at all the interoperator distances tested. The degree of repression depends very little on the spacing between the operators, however, a weak periodic dependency of 8 – 11 bp may exist.


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