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. 1989 Oct;171(10):5492–5502. doi: 10.1128/jb.171.10.5492-5502.1989

DNA footprint analysis of the transcriptional activator proteins NodD1 and NodD3 on inducible nod gene promoters.

R F Fisher 1, S R Long 1
PMCID: PMC210389  PMID: 2793828

Abstract

The Rhizobium meliloti nodD1 and nodD3 gene products (NodD1 and NodD3) are members of the lysR-nodD gene regulator family. They are functionally distinct in that NodD1 transcriptionally activates other nod genes in the presence of a flavonoid inducer such as luteolin, while NodD3 is capable of activating nod gene expression at high levels in the absence of inducer. NodD1 and NodD3 are DNA-binding proteins which interact with DNA sequences situated upstream of the transcription initiation sites of at least three sets of inducible nod genes. We report the footprinting of NodD1- and NodD3-DNA complexes with both DNase I and the 1,10-phenanthroline-copper ion reagent. NodD1 and NodD3 both interacted with the nodABC, nodFE, and nodH promoters and protected from cleavage an extensive piece of DNA, including the nod box, from approximately -20 to -75 from the transcription start site for each of the three promoters. The constitutively activating protein NodD3 displayed an additional hypersensitive cleavage site in its footprint compared with NodD1.

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Selected References

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