Figure 1
From: A new family of periplasmic-binding proteins that sense arsenic oxyanions
Gene arrangements for the arsenite oxidase (aio), alternative arsenite oxidase (arx) and respiratory arsenate reductase (arr) gene clusters. The aio represented is from Rhizobium sp. str. NT-26, arx from Alkalilimnicola ehrlichii str. MLHE-1 and arr from Chrysiogenes arsenatis. A: molybdenum-containing subunit; B: iron-sulphur protein; C: integral membrane subunit; R: response regulator; S: sensor histidine kinase; X: oxyanion-binding subunit. Putative promoter sites for RpoN are indicated, we could not detect a promoter upstream of arrAB.
