Enables peptidyl-proline 4-dioxygenase activity. Involved in peptidyl-proline hydroxylation to 4-hydroxy-L-proline. Predicted to be located in nucleoplasm. Predicted to be active in cytoplasm and nucleus. Human ortholog(s) of this gene implicated in renal cell carcinoma. Orthologous to human EGLN2 (egl-9 family hypoxia inducible factor 2). [provided by Alliance of Genome Resources, Apr 2022]