Purity > 90% as determined by SDS-PAGE. MW: 19.0kDa. Full Length: 1-117aa. N-terminal 6xHis-tagged. Escherichia coli (strain K12). Transcriptional repressor for the arsEFG operon. ArsE is a trans-acting regulatory protein which controls its own expression. The repressive effect of ArsE is alleviated by oxyions of +III oxidation state of arsenic, antimony, and bismuth, as well as arsenate (As (V))