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. 1991 Feb 25;19(4):833–840. doi: 10.1093/nar/19.4.833

Protein-DNA cross-linking at the lac promoter.

M Buckle 1, J Geiselmann 1, A Kolb 1, H Buc 1
PMCID: PMC333719  PMID: 2017366

Abstract

We report the results of photo-cross-linking of RNA polymerase and the cyclic AMP receptor protein (CRP) to the lac UV5 promoter region carried on either a linear fragment or a supercoiled plasmid. We have devised a protocol that allows the localisation of bases in contact with the protein. RNA polymerase makes contacts within the -10 and -35 regions of the promoter, essentially on the non-template strand. The CRP contact points found in a binary complex are affected by the formation of the ternary complex containing RNA polymerase. Supercoiling has no effect on the position of contacts in any of the complexes. These conclusions were derived from experiments performed using a generally applicable, non-interfering technique that reveals direct contacts between proteins and nucleic acids in nucleoprotein complexes.

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Selected References

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