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A gene cluster for amylovoran synthesis in Erwinia amylovora: characterization and relationship to cps genes in Erwinia stewartii

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Abstract

A large ams gene cluster required for production of the acidic extracellular polysaccharide (EPS) amylovoran by the fire blight pathogen Erwinia amylovora was cloned. Tn5 mutagenesis and gene replacement were used to construct chromosomal ams mutants. Five complementation groups, essential for amylovoran synthesis and virulence in E. amylovora, were identified and designated amsA-E. The ams gene cluster is about 7 kb in size and functionally equivalent to the cps gene cluster involved in EPS synthesis by the related pathogen Erwinia stewartii. Mucoidy and virulence were restored to E. stewartii mutants in four cps complementation groups by the cloned E. amylovora ams genes. Conversely, the E. stewartii cps gene cluster was able to complement mutations in E. amylovora ams genes. Correspondence was found between the amsA-E complementation groups and the cpsB-D region, but the arrangement of the genes appears to be different. EPS production and virulence were also restored to E. amylovora amsE and E. stewartii cpsD mutants by clones containing the Rhizobium meliloti exoA gene.

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  1. Frank Bernhard

    Present address: Technische Universität Berlin, Sekr. OE2, Biochemie, Franklinstrasse 29, W-1000, Berlin 10, FRG

Authors and Affiliations

  1. Max-Planck-Institut für medizinische Forschung, Jahnstrasse 29, W-6900, Heidelberg, Germany

    Frank Bernhard & Klaus Geider

  2. Department of Plant Pathology, The Ohio State University, 43210, Columbus, OH, USA

    David L. Coplin

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  1. Frank Bernhard
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  2. David L. Coplin
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Communicated by W. Goebel

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Bernhard, F., Coplin, D.L. & Geider, K. A gene cluster for amylovoran synthesis in Erwinia amylovora: characterization and relationship to cps genes in Erwinia stewartii . Molec. Gen. Genet. 239, 158–168 (1993). https://doi.org/10.1007/BF00281614

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