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Investigation of the multifaceted iron acquisition strategies of Burkholderia cenocepacia

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Abstract

Burkholderia cenocepacia is a bacterial pathogen which causes severe respiratory infections in cystic fibrosis (CF). These studies were aimed at gaining an insight into the iron acquisition strategies of B. cenocepacia. In iron restricted conditions, genes associated with the synthesis and utilisation of ornibactin (pvdA, orbA, orb F) were significantly upregulated compared to the expression of pyochelin associated genes (pchD, fptA). In the absence of alternative iron sources, B. cenocepacia J2315 and 715j utilised ferritin and haemin, but not transferrin or lactoferrin for growth. Significantly, mutants unable to produce ornibactin, (715j-orbI) or ornibactin and pyochelin, (715j-pobA), utilised haemin and ferritin more efficiently than the wild-type. Moreover, both mutants were also able to utilise lactoferrin for growth (P ≤ 0.01) and additionally 715j-pobA utilised transferrin (P ≤ 0.01), potentially facilitating adaptation to the host environment. Furthermore, B. cenocepacia increased ornibactin gene expression in response to pyoverdine from Pseudomonas aeruginosa (P ≤ 0.01), demonstrating the capacity to compete for iron in co-colonised niches. Pyoverdine also significantly diminished the growth of B. cenocepacia (P < 0.001) which was related to its iron chelating activity. In a study of three B. cenocepacia sequential clonal isolates obtained from a CF patient over a 3.5 year period, ornibactin upregulation in response to pyoverdine was less pronounced in the last isolate compared to the earlier isolates, as was growth in the presence of haemin and ferritin, indicating alternative iron acquisition mechanism(s) may dominate as chronic infection progresses. These data demonstrate the multifaceted iron acquisition strategies of B. cenocepacia and their capacity to be differentially activated in the presence of P. aeruginosa and during chronic infection.

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  1. Centre for Microbial Host Interactions (CMHI), ITT-Dublin, Tallaght, Dublin 24, Ireland

    J. Tyrrell, N. Whelan, C. Wright, S. McClean & Máire Callaghan

  2. IBB, CEBQ, Instituto Superior Técnico, Lisbon, Portugal

    I. Sá-Correia

  3. Department of Infection and Immunity, The University of Sheffield Medical School, Sheffield, UK

    M. Thomas

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  1. J. Tyrrell
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  2. N. Whelan
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Tyrrell, J., Whelan, N., Wright, C. et al. Investigation of the multifaceted iron acquisition strategies of Burkholderia cenocepacia . Biometals 28, 367–380 (2015). https://doi.org/10.1007/s10534-015-9840-1

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