## COLGALT1
- **UniProt:** Q8NBJ5 · **batch:** proteostasis-batch-2026-06-07 · **review status:** COMPLETE
- **PN placement:** `ER proteostasis | Maturation and folding of specific substrates | ER collagen processing and folding` ; **PN-node mapping:** group=mapped, scope=ok_for_propagation_to_go, GO:0032964 collagen biosynthetic process (class/branch = no_mapping)
- **Consistency:** Consistent. Review, notes-equivalent (rich references), PN annotation, and PN-node mapping all describe COLGALT1/GLT25D1 as a soluble ER-lumen collagen beta(1-O)galactosyltransferase (EC 2.4.1.50) performing the first committed step of collagen O-glycosylation. The collagen-biosynthesis framing is concordant across sources.
- **PN story / NEW pressure:** PN projects collagen biosynthetic process (GO:0032964, verified real OLS). COLGALT1's curated core function is the more specific GO:0050211 procollagen galactosyltransferase activity (MF) plus GO:0180062 protein O-linked glycosylation via galactose (BP), and it already carries GO:0030199 collagen fibril organization. GO:0032964 is a broader pathway-context process consistent with these but more general. Conclusion: PN context is **already captured** at a finer grain in the review; no additional NEW-term pressure from the PN node. (Review's own NEW is GO:0030145 Mn ion binding — orthogonal to PN.)
- **Mapping strategy:** No change. Mapping the group node to GO:0032964 is appropriate as a shared substrate-specific pathway context for the collagen-processing group; it is broader than COLGALT1's specific MF/BP but is a process-level umbrella, not an over-reach (unlike a CC/complex claim). Ancestors correctly no_mapping.
- **Evidence alignment:** PN row carries no reference titles; review evidence (PMID:19075007, PMID:20470363, PMID:22216269, PMID:27402836, PMID:30412317, Reactome collagen-galactosylation reactions) fully supports the collagen-biosynthesis mapping. No divergence.
- **Verdict:** Consistent; PN collagen-biosynthesis role already captured (more specifically) in review. No edits required.