NDLI: The isolation and initial characterization of mercury resistant chemolithotrophic thermophilic bacteria from mercury rich geothermal springs

Content Provider	Springer Nature Link
Author	Chatziefthimiou, Aspassia D. Crespo Medina, Melitza Wang, Yanping Vetriani, Costanti Barkay, Tamar
Copyright Year	2007
Abstract	Mercury rich geothermal springs are likely environments where mercury resistance is critical to microbial life and where microbe-mercury interactions may have evolved. Eleven facultative thermophilic and chemolithoautotrophic, thiosulfate oxidizing bacteria were isolated from thiosulfate enrichments of biofilms from mercury rich hot sulfidic springs in Mount Amiata, Italy. Some strains were highly resistant to mercury (≥200 μM HgCl2) regardless of its presence or absence during primary enrichments, and three reduced ionic mercury to its elemental form. The gene encoding for the mercuric reductase enzyme (MerA), was amplified by PCR from seven strains. However, one highly resistant strain did not reduce mercury nor carried merA, suggesting an alternative resistance mechanism. All strains were members of the order Bacillales and were most closely related to previously described thermophiles belonging to the Firmicutes. Phylogenetic analyses clustered the MerA of the isolates in two supported novel nodes within the Firmicutes lineage and a comparison with the 16S rRNA gene tree suggested at least one case of horizontal gene transfer. Overall, the results show that the thermophilic thiosulfate oxidizing isolates were adapted to life in presence of mercury mostly, but not exclusively, by possessing MerA. These findings suggest that reduction of mercury by chemolithotrophic thermophilic bacteria may mobilize mercury from sulfur and iron deposits in geothermal environments.
Starting Page	469
Ending Page	479
Page Count	11
File Format	PDF
ISSN	14310651
Journal	Extremophiles
Volume Number	11
Issue Number	3
e-ISSN	14334909
Language	English
Publisher	Springer-Verlag
Publisher Date	2007-03-31
Publisher Place	Tokyo
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Mercury Cheolithotrophs Thermophiles Hot sulfidic springs Ecology Biotechnology Microbiology
Content Type	Text
Resource Type	Article
Subject	Medicine Molecular Medicine Microbiology

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