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Genes responsible for coronatine synthesis in Pseudomonas syringae present in the genome of soft rot bacteria

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Abstract

Primers for the PCR amplification of homologous genes encoding polyketide coronafacic acid and coronafacic ligase in the cells of Pectobacterium atrosepticum SCRI1043 (BX950851) were developed to study the presence of these genes in the genome of Pectobacterium sp. and Dickeya sp. Coronafacic ligase catalyses the formation of coronatine from polyketide coronafacic acid and coronamic acid. Coronatine is a toxin produced by Pseudomonas syringae and is one of the major virulence factors in this bacterium. This study using several strains of P. atrosepticum, P. carotovorum subsp. carotovorum and Dickeya sp. isolated in different countries, indicated that all strains of P. atrosepticum possess genes coding coronafacic acid (cfa gene cluster) and coronafacic ligase (cfl). However, these genes were present only in the genome of five out of 50 tested P. carotovorum subsp. carotovorum strains and two out of 34 strains of Dickeya sp. tested. The PCR products homologous to the sequence of cfa7 and cfl gene fragments were sequenced in order to check the level of homology between genes of P. atrosepticum, P. carotovorum subsp. carotovorum and Dickeya sp. The sequences of the gene fragments amplified from all P. atrosepticum strains were almost identical (100% and 99.97%, respectively). The homology of the sequences obtained for P. atrosepticum and sequences of five P. carotovorum subsp. carotovorum and two Dickeya sp. was lower, between 89.69% to 95.00% for the cfl gene fragment, and about 94% for the cfa7 gene fragment.

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Authors and Affiliations

  1. Department of Biotechnology, Intercollegiate Faculty of Biotechnology, University of Gdansk and Medical University of Gdansk, Kladki 24, 80-822, Gdansk, Poland

    Monika Slawiak & Ewa Lojkowska

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  1. Monika Slawiak
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  2. Ewa Lojkowska
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Correspondence to Ewa Lojkowska.

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Slawiak, M., Lojkowska, E. Genes responsible for coronatine synthesis in Pseudomonas syringae present in the genome of soft rot bacteria. Eur J Plant Pathol 124, 353–361 (2009). https://doi.org/10.1007/s10658-008-9418-7

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  • DOI: https://doi.org/10.1007/s10658-008-9418-7

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