Journal
ENVIRONMENTAL CHEMISTRY
Volume 9, Issue 5, Pages 474-484Publisher
CSIRO PUBLISHING
DOI: 10.1071/EN12061
Keywords
arsenic biotransformation; arsenic metabolism; inductively coupled plasma mass spectrometry; Nostoc (Anabaena) sp PCC 7120; photosynthetic prokaryote; Synechocystis sp PCC 6803
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Funding
- Ministry of Agriculture, Forestry and Fisheries, Japan [2028]
- Japan Society for the Promotion of Science [DC2]
- Grants-in-Aid for Scientific Research [24570114] Funding Source: KAKEN
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Metabolic processes of incorporated arsenate in axenic cultures of the freshwater cyanobacteria Synechocystis sp. PCC 6803 and Nostoc (Anabaena) sp. PCC 7120 were examined. Analyses of arsenic compounds in cyanobacterial extracts using a high-performance liquid chromatography-inductively coupled plasma mass spectrometry system showed that both strains have an ability to biotransform arsenate into oxo-arsenosugar-glycerol within 20 min through (1) reduction of incorporated arsenate to arsenite and (2) methylation of produced arsenite to dimethylarsinic acid by methylarsonic acid as a possible intermediate product. In addition, Synechocystis sp. PCC 6803 cells are able to biosynthesise oxoarsenosugar-phosphate from incorporated arsenate. These findings suggest that arsenosugar formation as well as arsenic methylation in cyanobacteria possibly play a significant role in the global arsenic cycle.
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