Fig. 1.

Molecular organization of the arrAB gene cluster. The arrA gene is located upstream in the opposite orientation to an ars operon. CDS1 and CDS2 are similar to glutathione synthetases and a S. oneidensis MR-1 conserved hypothetical protein, respectively. The arrow between arsD and arrA indicates the location of potential Fnr-like binding sites. The loop after arrB is a putative transcriptional terminator region. Analysis of the putative Tat signal sequence within the first 42 amino acid residues of ArrA reveals a potential cleavage site (arrow).