Possesses RNA 5'-triphosphatase and diphosphatase activities, but displays a poor protein-tyrosine phosphatase activity. In addition, has phosphatase activity with ATP, ADP and O-methylfluorescein phosphate (in vitro). Binds to RNA. May participate in nuclear mRNA metabolism. Monomer (PubMed:24531476). May interact with SFRS7 and SFRS9/SRP30C (PubMed:24447265). Belongs to the protein-tyrosine phosphatase family. Non-receptor class dual specificity subfamily. It is uncertain whether Met-1 or Met-48 is the initiator. Truncated N-terminus. Truncated N-terminus. Truncated N-terminus.