Dioxygenase that can both act as a histone arginine demethylase and a lysyl-hydroxylase. Binds 1 Fe(2+) ion per subunit. Interacts with ced-5 and ced-12. Worms lacking psr-1 display more cell corpses than in wild-type animals. Belongs to the JMJD6 family. Was initially thought to constitute the phosphatidylserine receptor, a receptor that mediates recognition of phosphatidylserine, a specific marker only present at the surface of apoptotic cells, and participates in apoptotic cell phagocytosis. However, some results strongly suggest that it does not constitute the receptor for phosphatidylserine and is not involved in apoptotic cell removal.