Comparative proteomics reveals that a saxitoxin-producing and a nontoxic strain of Anabaena circinalis are two different ecotypes

Paul M. D'Agostino, Xiaomin Song, Brett A. Neilan, Michelle C. Moffitt

    Research output: Contribution to journalArticlepeer-review

    27 Citations (Scopus)

    Abstract

    In Australia, saxitoxin production is restricted to the cyanobacterial species Anabaena circinalis and is strain-dependent. We aimed to characterize a saxitoxin-producing and nontoxic strain of A. circinalis at the proteomic level using iTRAQ. Seven proteins putatively involved in saxitoxin biosynthesis were identified within our iTRAQ experiment for the first time. The proteomic profile of the toxic A. circinalis was significantly different from the nontoxic strain, indicating that each is likely to inhabit a unique ecological niche. Under control growth conditions, the saxitoxin-producing A. circinalis displayed a higher abundance of photosynthetic, carbon fixation and nitrogen metabolic proteins. Differential abundance of these proteins suggests a higher intracellular C:N ratio and a higher concentration of intracellular 2-oxoglutarate in our toxic strain compared with the nontoxic strain. This may be a novel site for posttranslational regulation because saxitoxin biosynthesis putatively requires a 2-oxoglutarate-dependent dioxygenase. The nontoxic A. circinalis was more abundant in proteins, indicating cellular stress. Overall, our study has provided the first insight into fundamental differences between a toxic and nontoxic strain of A. circinalis, indicating that they are distinct ecotypes.
    Original languageEnglish
    Pages (from-to)1474-1484
    Number of pages11
    JournalJournal of Proteome Research
    Volume13
    Issue number3
    DOIs
    Publication statusPublished - 7 Mar 2014

    Keywords

    • comparative proteomics
    • cyanobacteria
    • ecotype
    • iTRAQ
    • paralytic shellfish toxins
    • photosynthesis
    • saxitoxin

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