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Diffusible signal factor signaling controls bioleaching activity and niche protection in the acidophilic, mineral-oxidizing leptospirilli
Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science. (Ctr Ecol & Evolut Microbial Model Syst EEMiS)ORCID iD: 0000-0003-2842-3315
Pontificia Univ Catolica Chile, Chile.
Linnaeus University, Faculty of Health and Life Sciences, Department of Chemistry and Biomedical Sciences.ORCID iD: 0000-0002-8849-9883
Pontificia Univ Catolica Chile, Chile.
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2021 (English)In: Scientific Reports, E-ISSN 2045-2322, Vol. 11, no 1, article id 16275Article in journal (Refereed) Published
Abstract [en]

Bioleaching of metal sulfide ores involves acidophilic microbes that catalyze the chemical dissolution of the metal sulfide bond that is enhanced by attached and planktonic cell mediated oxidation of iron(II)-ions and inorganic sulfur compounds. Leptospirillum spp. often predominate in sulfide mineral-containing environments, including bioheaps for copper recovery from chalcopyrite, as they are effective primary mineral colonizers and oxidize iron(II)-ions efficiently. In this study, we demonstrated a functional diffusible signal factor interspecies quorum sensing signaling mechanism in Leptospirillum ferriphilum and Leptospirillum ferrooxidans that produces (Z)-11-methyl-2-dodecenoic acid when grown with pyrite as energy source. In addition, pure diffusible signal factor and extracts from supernatants of pyrite grown Leptospirillum spp. inhibited biological iron oxidation in various species, and that pyrite grown Leptospirillum cells were less affected than iron grown cells to self inhibition. Finally, transcriptional analyses for the inhibition of iron-grown L. ferriphilum cells due to diffusible signal factor was compared with the response to exposure of cells to N- acyl-homoserine-lactone type quorum sensing signal compounds. The data suggested that Leptospirillum spp. diffusible signal factor production is a strategy for niche protection and defense against other microbes and it is proposed that this may be exploited to inhibit unwanted acidophile species.

Place, publisher, year, edition, pages
Springer Nature, 2021. Vol. 11, no 1, article id 16275
National Category
Microbiology
Research subject
Ecology, Microbiology
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URN: urn:nbn:se:lnu:diva-106769DOI: 10.1038/s41598-021-95324-9ISI: 000684343800009PubMedID: 34381075Scopus ID: 2-s2.0-85112255213Local ID: 2021OAI: oai:DiVA.org:lnu-106769DiVA, id: diva2:1590704
Available from: 2021-09-03 Created: 2021-09-03 Last updated: 2022-09-15Bibliographically approved

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Bellenberg, SörenGanji, SureshUnelius, C. RikardDopson, Mark

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