TAILIEUCHUNG - Báo cáo Y học: Structural determination of the O-chain polysaccharide from Agrobacterium tumefaciens, strain DSM 30205

Agrobacterium tumefaciens is a Gram-negative, phytopathogenic bacterium and is characterized by an unique mode of action on dicotyledonous plants: it is able to genetically modify the host, and because of this feature, it is used as a tool for transgenic plants. Many experiments have demonstrated that lipopolysaccharides (LPSs) play an important role for the disease development, as they are involved in the adhesion process of the bacterium on the plant cell wall. | Eur. J. Biochem. 269 2885-2888 2002 FEBS 2002 doi Structural determination of the O-chain polysaccharide from Agrobacterium tumefaciens strain DSM 30205 Cristina De Castro1 Olga De Castro2 Antonio Molinaro1 and Michelangelo Parrilli1 1 Dipartimento di Chimica Organica and Biochimica Universita di Napoli Complesso Universitario Monte Sant Angelo Napoli Italy iDipartimento di Biologia Vegetale U niversiia di Napoli Italy Agrobacterium tumefaciens is a Gram-negative phytopatho-genic bacterium and is characterized by an unique mode of action on dicotyledonous plants it is able to genetically modify the host and because of this feature it is used as a tool for transgenic plants. Many experiments have demonstrated that lipopolysaccharides LPSs play an important role for the disease development as they are involved in the adhesion process of the bacterium on the plant cell wall. Despite the wealth of information on the role of LPS on phytopathogenesis the present paper appears as the first report on the molecular primary structure of the O-chain produced from Agrobacterium. Its repeating unit was determined by means of chemical and spectroscopical analysis and has the following structure 3 -a-D-Arf- 1fi3 -a-L-Fucp- 1fi. Keywords lipopolysaccharides Agrobacterium tumefaciens structure phytopathogenesis. Agrobacterium tumefaciens is a Gram-negative phytopatho-genic bacterium 1 which induces the crown gall disease on a wide range of dicotyledonous broad-leaved plants and especially to the members of the rose family such as apple pear and cherry some strains can attack also almond trees and grapevines. The disease gains its name from the large tumour-like swellings galls that typically occur at the crown of the plant just above soil level. The growth of all these plants is compromised leading damages to nursery stocks and to their marketability. This disease is one of the most widely studied because of its remarkable biology basically the .

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