## RUBCN
- **UniProt:** Q92622 · **batch:** proteostasis-pr-1217 · **review status:** COMPLETE
- **PN placement:** `ALP|Autophagosome closure maturation and lysosome fusion|Class 3 PI3K complex 2, direct|Class 3 PI3K complex 2 component` ; **PN-node mapping:** `type` leaf mapped, `ok_for_propagation_to_go` → GO:0034272 (class III PI3K complex, type II), goa_status `new_to_goa`; ancestors GO:0035032 / GO:0016236 context_only.
- **Consistency:** Mostly consistent, with one nuance. Review + notes correctly emphasize Rubicon as a NEGATIVE regulator of PI3KC3-C2/autophagosome maturation (inhibits VPS34; PMID:19270696, 21062745). PN Notes say only "Member of class III PI3K complex 2 that binds to UVRAG and inhibits activity" — captures the inhibitory role. The PN component-membership framing (treating Rubicon as a structural C2 subunit) is the contestable point: Rubicon binds only a subpopulation of UVRAG complexes and is often described as an associated regulator rather than a stoichiometric core subunit. Flag, not a contradiction.
- **PN story / NEW pressure:** PN asserts GO:0034272 membership that is absent from GOA (`new_to_goa`). Review adds GO:0034272 part_of as action NEW (PMID:28306502... actually RUBCN cites discovery/RUN-domain papers) — matching the PN projection. Term verified real. Review also proposes PI3K inhibitor / negative-regulation MF terms beyond PN. Verdict: ADD GO:0034272 (review already did) — aligned with PN.
- **Mapping strategy:** This gene supports (does not change) the existing C2-component → GO:0034272 mapping. Caveat: because Rubicon associates with only a UVRAG subpopulation and inhibits the complex, `part_of` GO:0034272 is defensible but borderline vs. an "associated regulator" reading; the review itself raises this as a suggested question. Ancestors correctly held too_broad. PN-projected term coincides with review (not broader/narrower).
- **Evidence alignment:** PN cites Annual Review, a cardiovascular-autophagy review, and PMID:19270696 (Matsunaga). Review uses primary PMID:19270696, 21062745 (RUN domain/PI3KC3 inhibition), 20974968, 20943950 (Rab7 RH-domain). PMID:19270696 shared.
- **Verdict:** Consistent; NEW GO:0034272 matches PN projection (verified, new_to_goa). Open question whether `part_of` vs "associated inhibitory regulator" is the right relation for a subpopulation binder — already flagged in the review's suggested_questions; no edits required.