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• W1973708492 startingPage "9939" @default.
• W1973708492 abstract "Plant signal molecules such as acetosyringone and certain monosaccharides induce the expression of Agrobacterium tumefaciens virulence (vir) genes, which are required for the processing, transfer, and possibly integration of a piece of the bacterial plasmid DNA (T-DNA) into the plant genome. Two fo the vir genes, virA and virG, belonging to the bacterial two-component regulatory system family, control the induction of vir genes by plant signals. virA encodes a membrane-bound sensor kinase protein and virG encodes a cytoplasmic regulator protein. Although it is well established from in vitro studies that the signal transduction process involves VirA autophosphorylation and subsequent phosphate transfer to VirG, the structural state of the VirA protein involved in signal transduction is not understood. In this communication, we describe an in vivo crosslinking approach which provides physical evidence that VirA exists as a homodimer in its native configuration. The dimerization of VirA neither requires nor is stimulated by the plant signal molecule acetosyringone. We also present genetic data which support the hypothesis that VirA exists as a homodimer which is the functional state transducing the plant signal in an intersubunit mechanism. To our knowledge, this report provides the first evidence that a bacterial membrane-bound sensor kinase exists and functions as a homodimer in vivo." @default.
• W1973708492 created "2016-06-24" @default.
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• W1973708492 date "1993-11-01" @default.
• W1973708492 modified "2023-10-13" @default.
• W1973708492 title "Preformed dimeric state of the sensor protein VirA is involved in plant--Agrobacterium signal transduction." @default.
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• W1973708492 doi "https://doi.org/10.1073/pnas.90.21.9939" @default.
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