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• W2169657072 startingPage "282" @default.
• W2169657072 abstract "Nodulation (nod) genes in Rhizobium meliloti are transcriptionally induced by flavonoid signal molecules, such as luteolin, produced by its symbiotic host plant, alfalfa. This induction depends on expression of nodD. Upstream of three inducible nod gene clusters, nodABC, nodFE, and nodH, is a highly conserved sequence referred to as a 'nod box.' The upstream sequences have no other obvious similarity. We have found that DNA fragments containing the regions upstream of all three inducible transcripts show altered electrophoretic mobility when treated with R. meliloti extracts. The ability of the extracts to interact specifically with these DNAs correlated with the genetic dosage of nodD1 or nodD3 and with the presence and concentration of the nodD1 or nodD3 protein (NodD1 or NodD3) in the extracts. Antiserum specific to NodD was used to construct an immunoaffinity column that permitted a substantial purification of NodD1; this preparation of NodD1 also displayed specific binding to restriction fragments containing DNA sequences found upstream of inducible nod genes. In addition, NodD-specific antiserum removed the specific DNA-binding activity from total Rhizobium cell extracts. The interaction of total extracts and of partially purified NodD protein with nod promoter sequences was competitive with an oligonucleotide representing the 3' 25-bp portion of the nod box. The interaction of R. meliloti extracts and NodD1 protein with nod gene upstream regions occurred independently of exposure of cells or extracts to flavone inducer." @default.
• W2169657072 created "2016-06-24" @default.
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• W2169657072 creator A5042270541 @default.
• W2169657072 creator A5057705231 @default.
• W2169657072 date "1988-03-01" @default.
• W2169657072 modified "2023-09-26" @default.
• W2169657072 title "Specific binding of proteins from Rhizobium meliloti cell-free extracts containing NodD to DNA sequences upstream of inducible nodulation genes." @default.
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• W2169657072 doi "https://doi.org/10.1101/gad.2.3.282" @default.
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