Possesses phosphotyrosine phosphatase activity in vitro (PubMed:21409566). Hydrolyzes para-nitrophenyl phosphate in vitro (PubMed:17976645, PubMed:21409566). Hydrolyzes O-methylfluorescein phosphate in vitro. Dephosphorylates the phosphoinositides PI(3,5)P2 (PubMed:21409566). H2O + O-phospho-L-tyrosyl-[protein] = L-tyrosyl-[protein] + phosphate Interacts with FLZ1. Highly expressed in roots, stems and flowers. Expressed at low levels in leaves and siliques. Belongs to the protein-tyrosine phosphatase family. Truncated N-terminus.