Regulatory role of the sequences downstream fromnodD3 P1 promoter ofRhizobium meliloti |
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| Authors: | Bing Zhu Xiaomi Dai Jiabi Zhu Guanqiao Yu Shanjiong Shen |
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| Institution: | (1) Shanghai Institute of Plant Physiology, Chinese Academy of Sciences, 200032 Shanghai, China |
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| Abstract: | The 660 bp region betweennodD3 P1 promoter and the following coding region ofRhizobium meliloti has been studied. This region is designated “downstream sequences”. It consists of two potential open reading frames, ORF1
and ORF2. Studies on the role of the downstream sequences on the activity ofnocD3 P1 with nod D3(P1)-IacZ fusion show that deletion of the sequences containing ORF2 causes the increase of the activity of the fusion; on the contrary,
addition of extra copies of ORF2 markedly decreases the activity of the fusion. These results indicate that the product of
ORF2 plays a negative role in the expression ofnod D3. |
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| Keywords: | Rhizobium meliloti nodD3P1 gene regulation downstream sequences |
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