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Nonribosomal peptide synthetase with a unique iterative-alternative-optional mechanism catalyzes amonabactin synthesis in Aeromonas

  • Genomics, transcriptomics, proteomics
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Abstract

Based on the exploration of data generated by genome sequencing, a bioinformatics approach has been chosen to identify the biosynthetic pathway of the siderophores produced by Aeromonas species. The amonabactins, considered as a virulence factor, represent a family of four variants of catechol peptidic siderophores containing Dhb, Lys, Gly, and an aromatic residue either Trp or Phe in a D-configuration. The synthesis operon is constituted of seven genes named amoCEBFAGH and is iron-regulated. The cluster includes genes encoding proteins involved in the synthesis and incorporation of the Dhb monomer, and genes encoding specific nonribosomal peptide synthetases, which are responsible for the building of the peptidic moiety. The amonabactin assembly line displays a still so far not described atypical mode of synthesis that is iterative, alternative, and optional. A disruption mutant in the adenylation domain of AmoG was unable to synthesize any amonabactin and to grow in iron stress conditions while a deletion of amoH resulted in the production of only two over the four forms. The amo cluster is widespread among most of the Aeromonas species, only few species produces the enterobactin siderophore.

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Acknowledgments

This work was supported by the University of Lille 1, the INTERREG IV program France-Wallonie-Vlaanderen (Phytobio project), the bioinformatics platform bilille and Inria. QE received financial support from Sana’a University (Yemen).

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Correspondence to Qassim Esmaeel.

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Funding

The work was funded by the University of Lille 1, the INTERREG IV program France-Wallonie-Vlaanderen (Phytobio project), the bioinformatics platform bilille, and Inria. QE received financial support from Sana’a University (Yemen).

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The authors declare that they have no conflict of interest.

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This article does not contain any studies with human participants or animals performed by any of the authors.

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Esmaeel, Q., Chevalier, M., Chataigné, G. et al. Nonribosomal peptide synthetase with a unique iterative-alternative-optional mechanism catalyzes amonabactin synthesis in Aeromonas . Appl Microbiol Biotechnol 100, 8453–8463 (2016). https://doi.org/10.1007/s00253-016-7773-4

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  • DOI: https://doi.org/10.1007/s00253-016-7773-4

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