NDLI: Extreme arsenic resistance by the acidophilic archaeon ‘Ferroplasma acidarmanus’ Fer1

Content Provider	Springer Nature Link
Author	Baker Austin, Craig Dopson, Mark Wexler, Margaret Sawers, R. Gary Stemmler, Ann Rosen, Barry P. Bond, Philip L.
Copyright Year	2007
Abstract	‘Ferroplasma acidarmanus’ Fer1 is an arsenic-hypertolerant acidophilic archaeon isolated from the Iron Mountain mine, California; a site characterized by heavy metals contamination. The presence of up to 10 g arsenate per litre [As(V); 133 mM] did not significantly reduce growth yields, whereas between 5 and 10 g arsenite per litre [As(III); 67–133 mM] significantly reduced the yield. Previous bioinformatic analysis indicates that ‘F. acidarmanus’ Fer1 has only two predicted genes involved in arsenic resistance and lacks a recognizable gene for an arsenate reductase. Biochemical analysis suggests that ‘F. acidarmanus’ Fer1 does not reduce arsenate indicating that ‘F. acidarmanus’ Fer1 has an alternative resistance mechanism to arsenate other than reduction to arsenite and efflux. Primer extension analysis of the putative ars transcriptional regulator (arsR) and efflux pump (arsB) demonstrated that these genes are co-transcribed, and expressed in response to arsenite, but not arsenate. Two-dimensional polyacrylamide gel electrophoresis analysis of ‘F. acidarmanus’ Fer1 cells exposed to arsenite revealed enhanced expression of proteins associated with protein refolding, including the thermosome Group II HSP60 family chaperonin and HSP70 DnaK type heat shock proteins. This report represents the first molecular and proteomic study of arsenic resistance in an acidophilic archaeon.
Starting Page	425
Ending Page	434
Page Count	10
File Format	PDF
ISSN	14310651
Journal	Extremophiles
Volume Number	11
Issue Number	3
e-ISSN	14334909
Language	English
Publisher	Springer-Verlag
Publisher Date	2007-02-01
Publisher Place	Tokyo
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Ferroplasma Arsenic resistance Arsenite Proteomics Primer extension Ecology Biotechnology Microbiology
Content Type	Text
Resource Type	Article
Subject	Medicine Molecular Medicine Microbiology

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