English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

Arsenic (As) is widespread in the environment and causes numerous health problems.  Rhodopseudomonas palustris  has been regarded as a good model organism for studying arsenic detoxification since it was first demonstrated to methylate environmental arsenic by conversion to soluble or gaseous methylated species. However, the detailed arsenic resistance mechanisms remain unknown though there are at least three arsenic-resistance operons ( ars1, ars2 , and  ars3 ) in  R. palustris . In this study, we investigated how arsenic multi-operons contributed to arsenic detoxification in  R. palustris . The expression of  ars2  or ars3 operons increased with increasing environmental arsenite (As(III)) concentrations (up to 1.0 mM) while transcript of  ars1  operon was not detected in the middle log-phase (55 h).  ars2  operon was actively expressed even at the low concentration of As(III) (0.01 μM), whereas the  ars3  operon was expressed at 1.0 μM of As(III), indicating that there was a differential regulation mechanism for the three arsenic operons. Furthermore,  ars2  and  ars3  operons were maximally transcribed in the early log-phase where  ars2  operon was 5.4-fold higher than that of  ars3  operon. A low level of  ars1  transcript was only detected at 43 h (early log-phase). Arsenic speciation analysis demonstrated that  R. palustris  could reduce As(V) to As(III). Collectively, strain CGA009 detoxified arsenic by using arsenic reduction and methylating arsenic mechanism, while the latter might occur with the presence of higher concentrations of arsenic.

Insights into arsenic multi-operons expression and resistance mechanisms in Rhodopseudomonas palustris CGA009