| ID | Term | Evidence |
| biological_process | |
| cellular_component | | GO:0005783 | endoplasmic reticulum | IEA | | GO:0005788 | endoplasmic reticulum lumen | IEA | | GO:0016222 | procollagen-proline 4-dioxygenase complex | TAS | |
| molecular_function | | GO:0004656 | procollagen-proline 4-dioxygenase activity | IMP | | GO:0005488 | binding | IEA | | GO:0005506 | iron ion binding | IEA | | GO:0016702 | oxidoreductase activity, acting on single donors with incorporation of molecular oxygen, incorporation of two atoms of oxygen | IEA | | GO:0016706 | oxidoreductase activity, acting on paired donors, with incorporation or reduction of molecular oxygen, 2-oxoglutarate as one donor, and incorporation of one atom each of oxygen into both donors | IEA | | GO:0031418 | L-ascorbic acid binding | IEA | | GO:0046872 | metal ion binding | IEA | |
| |
