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Possible role of reactive chlorine in microbial antagonism and organic matter chlorination in terrestrial environments
Stockholm University, Faculty of Science, Department of Geology and Geochemistry.
2009 (English)In: Environmental Microbiology, ISSN 1462-2912, E-ISSN 1462-2920, Vol. 11, no 6, 1330-1339 p.Article, review/survey (Refereed) Published
Abstract [en]

Several studies have demonstrated that extensive formation of organically bound chlorine occurs both in soil and in decaying plant material. Previous studies suggest that enzymatic formation of reactive chlorine outside cells is a major source. However, the ecological role of microbial-induced extracellular chlorination processes remains unclear. In the present paper, we assess whether or not the literature supports the hypothesis that extracellular chlorination is involved in direct antagonism against competitors for the same resources. Our review shows that it is by no means rare that biotic processes create conditions that render biocidal concentrations of reactive chlorine compounds, which suggest that extracellular production of reactive chlorine may have an important role in antagonistic microbial interactions. To test the validity, we searched the UniprotPK database for microorganisms that are known to produce haloperoxidases. It appeared that many of the identified haloperoxidases from terrestrial environments are originating from organisms that are associated with living plants or decomposing plant material. The results of the in silico screening were supported by various field and laboratory studies on natural chlorination. Hence, the ability to produce reactive chlorine seems to be especially common in environments that are known for antibiotic-mediated competition for resources (interference competition). Yet, the ability to produce haloperoxidases is also recorded, for example, for plant endosymbionts and parasites, and there is little or no empirical evidence that suggests that these organisms are antagonistic.

Place, publisher, year, edition, pages
2009. Vol. 11, no 6, 1330-1339 p.
Keyword [en]
weathering plant-material, curvularia haloperoxidase system, spruce forest soil, hydrogen-peroxide, vanadium chloroperoxidase, biological chlorination, antibiotic production, bound chlorine, enzymatic chlorination, antimicrobial activity
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:su:diva-60061DOI: 10.1111/j.1462-2920.2009.01915.xISI: 000266597200002OAI: oai:DiVA.org:su-60061DiVA: diva2:433207
Note
authorCount :4Available from: 2011-08-09 Created: 2011-08-08 Last updated: 2017-12-08Bibliographically approved

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