Cyanobacteria produce arsenosugars

@article{Miyashita2012CyanobacteriaPA,
  title={Cyanobacteria produce arsenosugars},
  author={Shin-ichi Miyashita and C Fujiwara and Mikio Tsuzuki and Toshikazu Kaise},
  journal={Environmental Chemistry},
  year={2012},
  volume={9},
  pages={474-484}
}
Environmental context Although arsenic is known to accumulate in both marine and freshwater ecosystems, the pathways by which arsenic is accumulated and transferred in freshwater systems are reasonably unknown. This study revealed that freshwater cyanobacteria have the ability to produce arsenosugars from inorganic arsenic compounds. The findings suggest that not only algae, but cyanobacteria, play an important role in the arsenic cycle of aquatic ecosystems. Abstract Metabolic processes of… Expand

Figures and Tables from this paper

Arsenic metabolism in cyanobacteria
Environmental context Cyanobacteria are ecologically important, photosynthetic organisms that are widely distributed throughout the environment. They play a central role in arsenic transformations inExpand
Biosynthesis of arsenolipids by the cyanobacterium Synechocystis sp. PCC 6803
Although methylated arsenic and arsenosugars have been verified in various freshwater organisms, lipid-soluble arsenic compounds have not been identified. Here, we report investigations with theExpand
Arsenic Methyltransferase is Involved in Arsenosugar Biosynthesis by Providing DMA.
TLDR
The results suggest that ArsM is a required enzyme for the methylation of inorganic arsenicals, but not required for the synthesis of arsenosugars from DMA, and that DMA is the precursor of arsenoarsenicals biosynthesis. Expand
Arsenic biotransformation by a cyanobacterium Nostoc sp. PCC 7120.
TLDR
The total arsenic of methylated arsenic, arsenosugars, and arsenosugar phospholipids in Nostoc cells with increasing As(III) exposure were not markedly different, indicating that the transformation to organoarsenic in NostOC was not dependent on As( III) concentration in the medium. Expand
Arsenic Demethylation by a C·As Lyase in Cyanobacterium Nostoc sp. PCC 7120.
TLDR
Investigation of arsenic demethylation in a typical freshwater cyanobacterium Nostoc sp. Expand
Review of arsenic speciation, toxicity and metabolism in microalgae
  • Ya Wang, S. Wang, +6 authors Y. Ge
  • Biology
  • Reviews in Environmental Science and Bio/Technology
  • 2015
TLDR
Future research need to focus on the regulative mechanisms of arsenic absorption, biotransformation and excretion at molecular level; the effects of intracellular nutrient dynamics on arsenic speciation; the impacts of culture regime on the arsenic metabolism in microalgae; and the transfer of arsenic species across aquatic food web in order to better evaluate the roles of micro algae in arsenic cycling. Expand
Identification of Steps in the Pathway of Arsenosugar Biosynthesis.
TLDR
This study represents the identification of the first two steps in the pathway of arsenosugar biosynthesis and expands the catalytic repertoire of the diverse radical SAM enzyme superfamily and provides a basis for studying the biogeochemistry of complex organoarsenicals. Expand
Analytical approaches for proteomics and lipidomics of arsenic in algae
Abstract Arsenic (As) is an element with a complex chemistry found in relatively high concentrations in the marine environment. A diverse group of As compounds or As species exist in the marineExpand
Genomic potential for arsenic efflux and methylation varies among global Prochlorococcus populations
TLDR
An additional putative arsenic mediation strategy in Prochlorococcus driven by the enzyme arsenite S-adenosylmethionine methyltransferase (ArsM) which can convert inorganic arsenic into more innocuous organic forms and appears to be a more widespread mode of detoxification. Expand
Arsenic speciation and biotransformation pathways in the aquatic ecosystem: The significance of algae.
TLDR
The current review provides the updated and useful framework for government and water treatment agencies to implement algae in As remediation programs globally. Expand
...
1
2
3
...

References

SHOWING 1-10 OF 49 REFERENCES
Biotransformation and Volatilization of Arsenic by Three Photosynthetic Cyanobacteria1
TLDR
This study investigated As biotransformation in three cyanobacterial species and proposed that ArsM homologs are widespread in cyanobacteria and play an important role in As biogeochemistry. Expand
Biotransformation of arsenic by a Yellowstone thermoacidophilic eukaryotic alga
TLDR
The importance of eukaryotic microorganisms to the biogeochemical cycling of arsenic in geothermal systems is illustrated, a molecular explanation for how these algae tolerate arsenic in their environment is offered, and the characterization of algal methyltransferases is provided. Expand
Rapid Biotransformation of Arsenate into Oxo-Arsenosugars by a Freshwater Unicellular Green Alga, Chlamydomonas reinhardtii
TLDR
Results indicate that this alga can rapidly biotransform arsenate into oxo-arsenosugar-glycerol for at least 10 min and then oxo -arsenos sugar-phosphate through both reduction of incorporated arsenate to arsenate and methylation of arsenite and/or arsenate retained in the cells to dimethylarsinic acid via methylarsonic acid as an possible intermediate. Expand
Arsenosugar phospholipids and arsenic hydrocarbons in two species of brown macroalgae
Environmental context Although organoarsenic compounds occur in marine organisms at high concentrations, the origin and role of these compounds is unknown. Arsenic-containing lipids (arsenolipids)Expand
Arsenic metabolism in marine bacteria and yeast
TLDR
Both the bacterium and the yeast converted relatively toxic arsenate, the most abundant arsenic compound in seawater, to products that were presumably less toxic, as well as generating gaseous forms of arsenic such as methylarsines. Expand
Microbial arsenic: from geocycles to genes and enzymes.
TLDR
The DNA sequencing and protein crystal structures have established the convergent evolution of three classes of arsenate reductases, which involve three cysteine thiols and S-As bond intermediates, so convergence evolution to similar mechanisms has taken place. Expand
Arsenic Compounds in Zoo- and Phyto-plankton of Marine Origin
Major water-soluble arsenic compounds accumulated in some zoo- and phyto-plankton were identified. Zooplankton were collected at sampling stations in the Sea of Japan by a Norpac net towed from 600 mExpand
Rapid determination of arsenic species in freshwater organisms from the arsenic-rich Hayakawa River in Japan using HPLC-ICP-MS.
Speciation analyses of water-soluble arsenicals from freshwater and biological samples collected from the Hayakawa River (Kanagawa, Japan), which contains a high concentration of arsenic, wereExpand
Dimethylarsinoylacetate from microbial demethylation of arsenobetaine in seawater
The fate of 11 arsenic compounds in microbially enriched seawater was monitored for up to 10 days by HPLC–ICPMS. Most of the arsenicals underwent little or no change in this medium, whereas two ofExpand
Arsenic accumulation by arsenic‐tolerant freshwater blue‐green alga (Phormidium sp.)
Accumulation, biomethylation and excretion of arsenic by the arsenic-tolerant freshwater blue–green alga, Phormidium sp., which had been isolated from an arsenic-polluted environment, wereExpand
...
1
2
3
4
5
...