# PN dossier: FBXW5

- review_batch: proteostasis-batch-2026-06-13
- review_yaml: genes/human/FBXW5/FBXW5-ai-review.yaml
- PN workbook rows: 2

## PN row 1: Autophagy-Lysosome Pathway | Autophagophore initiation and elongation | Regulation of autophagophore membrane composition | ER membrane input | COPII vesicle component regulator
- UniProt: Q969U6
- In branches: ALP, UPS
- Notes: Targets SEC23B for proteasomal degradation by ubiquitination which interferes with promotion of autophagosome formation by COPII. ULK1 phosphorylates SEC23B to inhibit its degradation.
- PN references (titles):
    - The ULK1-FBXW5-SEC23B nexus controls autophagy | eLife (elifesciences.org)
- PN-node mapping records (path + ancestors):
    - [subtype] Autophagy-Lysosome Pathway|Autophagophore initiation and elongation|Regulation of autophagophore membrane composition|ER membrane input|COPII vesicle component regulator
        status=no_mapping scope= GO=[]
        rationale: This PN leaf groups upstream regulators of COPII contribution to autophagophore membrane input. The two-member set does not support one crisp shared GO term beyond broad vesicle-coating or kinase context.
    - [type] Autophagy-Lysosome Pathway|Autophagophore initiation and elongation|Regulation of autophagophore membrane composition|ER membrane input
        status=no_mapping scope= GO=[]
        rationale: Reviewed as a contextual PN role. The label is useful for curator triage, but by itself does not support a universal GO assertion for all member genes beyond curated ancestor or child mappings.
    - [group] Autophagy-Lysosome Pathway|Autophagophore initiation and elongation|Regulation of autophagophore membrane composition
        status=no_mapping scope= GO=[]
        rationale: Reviewed as a broad PN taxonomy container. The descendants mix components, regulators, context labels, and mechanistic leaves, so propagation should come only from narrower curated nodes.
    - [class] Autophagy-Lysosome Pathway|Autophagophore initiation and elongation
        status=context_only scope=too_broad_to_propagate GO=[GO:0016236 macroautophagy]
        rationale: This class is a real macroautophagy context, but its descendants include core factors, component buckets, upstream modulators, localization roles, and residual categories. Projecting generic macroautophagy from this ancestor creates TRAPP-like overpropagation, so candidate GO annotations must come from narrower curated nodes.
    - [branch] Autophagy-Lysosome Pathway
        status=no_mapping scope= GO=[]
        rationale: Reviewed as the top-level PN branch. It is a project taxonomy umbrella rather than a direct GO assertion; all propagation must come from manually curated child nodes.

## PN row 2: Ubiquitin Proteasome System | E3 ubiquitin and UBL ligases | Cul1 substrate receptor | F-box | WD40
- UniProt: Q969U6
- In branches: ALP, UPS
- Signature domains: IPR001810
- Auxiliary domains: IPR001680
- PN references (titles):
    - 15340381 / rev
- PN-node mapping records (path + ancestors):
    - [subtype] Ubiquitin Proteasome System|E3 ubiquitin and UBL ligases|Cul1 substrate receptor|F-box|WD40
        status=no_mapping scope= GO=[]
        rationale: Reviewed as a narrower substrate-receptor, adaptor, domain, or family subdivision already covered by the curated parent adaptor/receptor mapping. No additional direct GO mapping is needed at this node.
    - [type] Ubiquitin Proteasome System|E3 ubiquitin and UBL ligases|Cul1 substrate receptor|F-box
        status=no_mapping scope= GO=[]
        rationale: Reviewed as a narrower substrate-receptor, adaptor, domain, or family subdivision already covered by the curated parent adaptor/receptor mapping. No additional direct GO mapping is needed at this node.
    - [group] Ubiquitin Proteasome System|E3 ubiquitin and UBL ligases|Cul1 substrate receptor
        status=mapped scope=ok_for_propagation_to_go GO=[GO:1990756 ubiquitin-like ligase-substrate adaptor activity]
        rationale: This PN group captures substrate receptors/adaptors for cullin/UBL ligase systems. The shared GO molecular-function target is ubiquitin-like ligase-substrate adaptor activity.
    - [class] Ubiquitin Proteasome System|E3 ubiquitin and UBL ligases
        status=context_only scope=too_broad_to_propagate GO=[GO:0061630 ubiquitin protein ligase activity]
        rationale: This class is a genuine E3-ligase context, but its descendants include catalytic ligases, cullin scaffolds, substrate receptors, adaptors, cofactors, regulators, and UBL modifier systems. A class-level propagation would over-annotate.
    - [branch] Ubiquitin Proteasome System
        status=no_mapping scope= GO=[]
        rationale: Reviewed as the top-level UPS branch. It is a project taxonomy umbrella rather than a direct GO assertion; UPS propagation must come from manually curated child nodes.

## Projected GO annotations (1)
- GO:1990756 ubiquitin-like ligase-substrate adaptor activity | scope=ok_for_propagation_to_go | goa_status=new_to_goa | from=Ubiquitin Proteasome System|E3 ubiquitin and UBL ligases|Cul1 substrate receptor