Bacterial biofilms on gold grains-implications for geomicrobial transformations of gold

Rea, Maria Angelica, Zammit, Carla M. and Reith, Frank (2016) Bacterial biofilms on gold grains-implications for geomicrobial transformations of gold. Fems Microbiology Ecology, 92 6: . doi:10.1093/femsec/fiw082


Author Rea, Maria Angelica
Zammit, Carla M.
Reith, Frank
Title Bacterial biofilms on gold grains-implications for geomicrobial transformations of gold
Journal name Fems Microbiology Ecology   Check publisher's open access policy
ISSN 0168-6496
1574-6941
Publication date 2016-06
Year available 2016
Sub-type Critical review of research, literature review, critical commentary
DOI 10.1093/femsec/fiw082
Open Access Status Not Open Access
Volume 92
Issue 6
Total pages 12
Place of publication Oxford, United Kingdom
Publisher Oxford University Press
Collection year 2017
Language eng
Formatted abstract
The biogeochemical cycling of gold (Au), i.e. its solubilization, transport and re-precipitation, leading to the (trans)formation of Au grains and nuggets has been demonstrated under a range of environmental conditions. Biogenic (trans)formations of Au grains are driven by (geo)biochemical processes mediated by distinct biofilm consortia living on these grains. This review summarizes the current knowledge concerning the composition and functional capabilities of Au-grain communities, and identifies contributions of key-species involved in Au-cycling. To date, community data are available from grains collected at 10 sites in Australia, New Zealand and South America. The majority of detected operational taxonomic units detected belong to the α-, β- and γ -Proteobacteria and the Actinobacteria. A range of organisms appears to contribute predominantly to biofilm establishment and nutrient cycling, some affect the mobilization of Au via excretion of Au-complexing ligands, e.g. organic acids, thiosulfate and cyanide, while a range of resident Proteobacteria, especially Cupriavidus metallidurans and Delftia acidovorans, have developed Au-specific biochemical responses to deal with Au-toxicity and reductively precipitate mobile Au-complexes. This leads to the biomineralization of secondary Au and drives the environmental cycle of Au.
Keyword Biofilms
Gold nuggets
Gold
Bacteria
Detoxification
Biomineralization
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Critical review of research, literature review, critical commentary
Collections: School of Earth Sciences Publications
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