Fig. 4

Structure of ArsR^M from Brevundimonassp. M20. (A) Homologous model of the ArsR^M dimer; (B) Different orientations of the two monomers; (C) Structure of ArsR^M monomer; (D) Structures of the DNA-binding domain (DBD) of ArsR^M and ArsR. ArsR^M and ArsR were presented by blue and gray cartoon respectively; (E) S-adenosylmethionine-binding motif; (F) As(III)-binding site residues