C28G1.2

UniProt ID: Q18287
Organism: Caenorhabditis elegans
Review Status: COMPLETE
📝 Provide Detailed Feedback

Gene Description

Caenorhabditis elegans C28G1.2 encodes a 265-residue serpin-domain-containing protein. Its compact, divergent sequence supports membership in the serpin structural superfamily but does not establish protease inhibition, collagen chaperoning or a specific cellular compartment. Its physiological function remains unknown.

Existing Annotations Review

GO Term Evidence Action Reason
GO:0005576 extracellular region
IBA
GO_REF:0000033
UNDECIDED
Summary: The extracellular IBA represents an ancestral localization inference, not a direct secretion assay. The compact target has no called signal peptide in the retrieved record, but that alone cannot overrule the phylogenetic judgment or exclude unconventional export. Target localization and the applicability of the secretion-bearing ancestor to this divergent architecture remain unresolved.
Supporting Evidence:
file:worm/C28G1.2/C28G1.2-uniprot.txt
DOMAIN 96..199
PMID:10373004
Some appear complete, some show extensive deletions, and others appear to contain only the C-terminal part of the known serpin fold

References

Loading supporting content…

Download this section (compressed HTML)

Suggested Questions for Experts

Q: Does purified C28G1.2 exhibit a serpin inhibition mechanism, a noninhibitory binding function, or a structurally distinct role?

External Prediction Reviews

These computational predictions are reviewed separately from the GOA annotation set used for this review. The assessments below are from this project and do not constitute official GO annotations or endorsement by GO/UniProt. They are not included in the existing annotation review above.

ProtNLM2 External predictions

View prediction review YAML · C28G1.2-protnlm-predictions-review.yaml · Review status: COMPLETE

Serpin structural similarity does not resolve whether C28G1.2 is inhibitory, noninhibitory or collagen-associated. Both emitted inhibitory GO claims remain biologically unverified.

Source documents: genes/worm/C28G1.2/C28G1.2-protnlm-source.json · genes/worm/C28G1.2/C28G1.2-notes.md

Review score: 2 = concordant with evidence; 1 = uncertain; 0 = discordant with evidence. This is an assessment score, not a model probability.

GO:0010466 negative regulation of peptidase activity GO_BP
UNC — Uncertain Review score: 1/2
Prediction method: ProtNLM2 · Version: UniProt API snapshot 2026-09-10 · file:worm/C28G1.2/C28G1.2-protnlm-source.json
Review rationale: The serpin fold includes inhibitory and noninhibitory proteins. Neither a target protease nor inhibitory activity is established for C28G1.2, and the compact nematode architecture makes a generic structural match insufficient to transfer an inhibitory process. The available evidence also does not demonstrate loss of every possible inhibitory function.
Supporting Evidence:
GO:0004867 serine-type endopeptidase inhibitor activity GO_MF
UNC — Uncertain Review score: 1/2
Prediction method: ProtNLM2 · Version: UniProt API snapshot 2026-09-10 · file:worm/C28G1.2/C28G1.2-protnlm-source.json
Review rationale: No C28G1.2 inhibition experiment, protease specificity or validated inhibitory reactive-center-loop mechanism was found. A high-confidence structural match to a serpin donor is not an assay of this activity, particularly for a compact and divergent sequence. This is unresolved rather than a proven noninhibitory serpin.
Supporting Evidence:

Deep Research

Falcon

(C28G1.2-deep-research-falcon.md)

Loading supporting content…

Download this section (compressed HTML)

📚 Additional Documentation

Notes

(C28G1.2-notes.md)

Loading supporting content…

Download this section (compressed HTML)

Protnlm Function Review

(C28G1.2-protnlm-function-review.md)

Loading supporting content…

Download this section (compressed HTML)

📄 View Raw YAML

Loading supporting content…

Download this section (compressed HTML)