Difference between plasmid and cosmid3/12/2024 ![]() The activated virG protein, in turn, activates the transcription of Ti-plasmid-located loci, other vir genes, that code for proteins that process the T-DNA from the Ti-plasmid and form the molecular apparatus that allows the passage of the transferred DNA from the bacterium to the plant cell. It is thought that this event leads to the modification of the virG protein, resulting in its activation. Agrobacterium perceives these signals via the virA gene product. ![]() Wounded plant cells secrete a number of phenolic compounds, including acetosyringone and related molecules. The infection cycle of Agrobacterium involves a complex series of chemical signals that pass between the susceptible plant and the bacterium. The region of DNA that is transferred is called the T (transferred) DNA and is located on a plasmid, the Ti (tumor inducing) plasmid, harbored by virulent strains of the bacterium. The molecular mechanism of Agrobacterium tumorigenesis involves the transfer of bacterial DNA to plant cells, where it stably integrates into the plant nuclear genome and is expressed. KARCHER, in Molecular Biology, 1995 The Insert DNA to Be Cloned: Origin and Significance of Cosmid 203Īgrobacterium tumefaciens causes the tumorous disease crown cell on many species of plants.
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