alexa Structural and putative regulatory genes involved in cellulose synthesis in Rhizobium leguminosarum bv. trifolii.


Journal of Microbial & Biochemical Technology

Author(s): Ausmees N, Jonsson H, Hglund S, Ljunggren H, Lindberg M

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Abstract Six genes involved in cellulose synthesis in Rhizobium leguminosarum bv. trifolii were identified using Tn5 mutagenesis. Four of them displayed homology to the previously cloned and sequenced Agrobacterium tumefaciens cellulose genes celA, celB, celC and celE. These genes are organized similarly in R. leguminosarum bv. trifolii. In addition, there were strong indications that two tandemly located genes, celR1 and celR2, probably organized as one operon, are involved in the regulation of cellulose synthesis. The deduced amino acid sequences of these genes displayed a high degree of similarity to the Caulobacter crescentus DivK and PleD proteins that belong to the family of two-component response regulators. This is to our knowledge the first report of genes involved in the regulation of cellulose synthesis. Results from attachment assays and electron microscopic studies indicated that cellulose synthesis in R. leguminosarum bv. trifolii is induced upon close contact with plant roots during the attachment process. This article was published in Microbiology and referenced in Journal of Microbial & Biochemical Technology

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