## CACUL1
- **UniProt:** Q86Y37 (CAC1, C10orf46) · **batch:** proteostasis-batch-2026-06-07 · **review status:** COMPLETE
- **PN placement:** `UPS|E3 ubiquitin and UBL ligases|Cullin|degenerate, possible CUL3 inhibitor` ; **PN-node mapping:** type node `degenerate, possible CUL3 inhibitor` no_mapping; group node `Cullin` mapped → GO:0160072 ubiquitin ligase complex scaffold activity (ok_for_propagation, new_to_goa); class context_only (GO:0061630, too_broad).
- **Consistency:** CONTRADICTION flagged. Deep-research notes and the review explicitly argue CACUL1 is NOT a functional cullin-RING scaffold: it is a 369-aa protein with only a cullin-repeat-LIKE fold, far shorter than canonical cullins (~750-900 aa), lacking any RBX/neddylation module, with no evidence it nucleates a CRL. The review MARK_AS_OVER_ANNOTATED the two IEA cullin-domain-transfer terms (GO:0006511, GO:0031625) precisely on these grounds. Its best-supported function is CDK2 binding/activation (PMID:19829063) plus ERalpha co-repression (PMID:23178685). The PN node label itself hedges ("degenerate, possible CUL3 inhibitor"). The PN group mapping to GO:0160072 scaffold activity therefore directly conflicts with the review's conclusion.
- **PN story / NEW pressure:** Over-reaches. PN's projected GO:0160072 (verified real via OLS) asserts a ubiquitin-ligase-scaffold MF that the review rejects as a domain-homology over-annotation. There is no experimental support for scaffold/CRL activity. Do NOT add — this is an over-reach analogous to (worse than) the rejected broader-term precedents. The gene's defensible MF is GO:0019901 protein kinase binding (CDK2), already accepted as core in the review.
- **Mapping strategy:** This gene argues AGAINST propagating the Cullin-group GO:0160072 mapping to CACUL1. The type node (`degenerate, possible CUL3 inhibitor`) is correctly no_mapping, but the group→GO:0160072 projection should be suppressed/excepted for CACUL1 because it is a degenerate non-scaffold member. The group mapping may be fine for bona fide cullins, but CACUL1 should be flagged as a member that does not inherit it.
- **Evidence alignment:** PN cites 26238671 (a CUL3-related paper, basis for the "possible CUL3 inhibitor" hedge). Review's evidence (PMID:19829063 CDK2, 23178685 ERalpha, 28169274 ARMC5 Y2H) does not overlap; PN evidence is not in the review and supports a speculative CUL3-regulator role not adopted by the review.
- **Verdict:** Inconsistent — PN over-reaches. GO:0160072 scaffold MF should not propagate to CACUL1 (no scaffold evidence; review treats cullin-fold terms as over-annotation).
- **Recommended edits:** Suppress/except the Cullin-group GO:0160072 projection for CACUL1; mark the node mapping as not-inherited for this degenerate member. [MAP]