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- Title
Arsinothricin, a novel organoarsenic species produced by a rice rhizosphere bacterium.
- Authors
Masato Kuramata; Futa Sakakibara; Ryota Kataoka; Kenichi Yamazaki; Koji Baba; Masumi Ishizaka; Syuntaro Hiradate; Tsunashi Kamo; Satoru Ishikawa
- Abstract
Methylated arsenic compounds in rice grains originate from the action of soil bacteria in the rice rhizosphere. Here, we investigated the chemical structures of arsenic compounds produced by a bacterium, Burkholderia gladioli strain GSRB05, in the rice rhizosphere. When cultured in liquid R2A medium containing arsenite (AsIII), strain GSRB05 produced two unknown novel arsenic compounds that were later identified as arsinothricin (AST, 2-amino-4-(hydroxymethylarsinoyl) butanoic acid), an arsenic mimetic of the herbicide phosphinothricin, and a probable hydroxyl precursor of AST, termed AST-OH (2-amino-4-(dihydroxyarsonoyl)butanoic acid). The chemical structure of AST was determined by means of liquid chromatography-high-resolution tandem mass spectrometry and NMR analyses, whereas that of AST-OH was estimated by means of ultra-high-performance liquid chromatography-tandem mass spectrometry. Time-dependent AsIII transformation by strain GSRB05 showed that AST was produced after AST-OH. Compared with AsIII, AST showed higher absorption by, and was more toxic to, Escherichia coli DH5a cells in M9 minimal medium, which lacks amino acids. These findings have implications for the environmental transfer of arsenic, and human health consequences in terms of our dietary burden of arsenic.
- Subjects
RICE residues; ARSENIC poisoning; CHEMICAL structure
- Publication
Environmental Chemistry (14482517), 2016, Vol 13, Issue 4, p723
- ISSN
1448-2517
- Publication type
Article
- DOI
10.1071/EN14247