NaBBL_candidate_FOX1_4 is an additional BBL-family late oxidoreductase candidate in Nicotiana attenuata. The BBL family's role in late nicotine chemistry is now well supported, but FOX1_4 remains one of several unresolved attenuata paralogs.
| GO Term | Evidence | Action | Reason |
|---|---|---|---|
| GO:0005773 vacuole | IEA GO_REF:0000044 | KEEP AS NON CORE | Summary: Vacuolar localization is plausible contextual information. Reason: Retain the location while keeping the review focused on unresolved paralog identity within the BBL family. |
| GO:0016491 oxidoreductase activity | IEA GO_REF:0000002 | MARK AS OVER ANNOTATED | Summary: The parent oxidoreductase term is true but too broad. Reason: BBL-family proteins are now linked to a specific late nicotine oxidation role rather than only generic redox chemistry. Supporting Evidence: file:NICAT/NaBBL_candidate_FOX1_4/NaBBL_candidate_FOX1_4-notes.md The full preprint identifies BBLa/NicGS as the BBL-family enzyme responsible for stereoselective late-pathway oxidation in nicotine synthesis, so FOX1_4 remains a substantive BBL-like candidate rather than a generic flavoprotein bystander. |
| GO:0050660 flavin adenine dinucleotide binding | IEA GO_REF:0000002 | ACCEPT | Summary: FAD binding is an appropriate annotation for this flavoprotein. Reason: The BBL family is FAD linked, making this a useful and specific cofactor annotation. |
| GO:0071949 FAD binding | IEA GO_REF:0000002 | REMOVE | Summary: This duplicates GO:0050660. Reason: Keep the more explicit flavin adenine dinucleotide binding term and remove the redundant duplicate. |
| GO:0042179 nicotine biosynthetic process | IEA GO_REF:0000041 | KEEP AS NON CORE | Summary: FOX1_4 is a plausible nicotine-pathway paralog but not a uniquely resolved one. Reason: The pathway role of the BBL family is strong, yet the exact attenuata paralog assignment remains open. Supporting Evidence: file:NICAT/NaBBL_candidate_FOX1_4/NaBBL_candidate_FOX1_4-notes.md The paper sharpens the biological role of the family but does not settle which current NICAT BBL paralog corresponds to the tobacco NicGS enzyme. |
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Download this section (compressed HTML)Q: Does FOX1_4 retain measurable late nicotine oxidase activity despite not being the leading BBL anchor?
Q: Is FOX1_4 expressed in the same root cell populations as the stronger BBL candidates?
Experiment: Test FOX1_4 in a reconstructed late-pathway assay alongside A622, UGT, and BGL components.
Hypothesis: FOX1_4 has weaker or partial BBL-like activity relative to the leading candidate.
Type: pathway reconstitution assay
Experiment: Compare FOX1_4 loss-of-function and multiplex BBL-family perturbations for effects on nicotine intermediates.
Hypothesis: FOX1_4 contributes redundantly within the BBL paralog set rather than acting as the sole late oxidase.
Type: comparative genetics plus metabolite profiling
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