Possesses arsenate reductase activity in vitro. Catalyzes the reduction of arsenate [As(V)] to arsenite [As(III)]. May play a role in arsenic retention in roots. Possesses phosphatase activity towards p-nitrophenyl phosphate in vitro. [glutaredoxin]-dithiol + arsenate + glutathione + H(+) = arsenite + glutathionyl-S-S-[glutaredoxin] + H2O By arsenate. Truncated N-terminus. Truncated N-terminus. Truncated N-terminus.