NaBBL1_candidate_FOX1_0

UniProt ID: A0A1J6JGR6
Organism: Nicotiana attenuata
Review Status: DRAFT
Aliases:
FOX1_0 NaBBL1
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Gene Description

NaBBL1_candidate_FOX1_0 is a BBL-family FAD-linked oxidoreductase and a plausible NICAT late-pathway nicotine candidate. The recent glucosylation paper makes BBL-family involvement in the late nicotine step secure, but it does not single out FOX1_0 as the uniquely correct attenuata paralog.

Existing Annotations Review

GO Term Evidence Action Reason
GO:0005773 vacuole
IEA
GO_REF:0000044 		KEEP AS NON CORE
Summary: Vacuolar localization is plausible and should be retained as non-core context.
Reason: UniProt supports vacuolar localization, but the main review question is which BBL paralog carries the late nicotine chemistry.
Supporting Evidence:
file:NICAT/NaBBL1_candidate_FOX1_0/NaBBL1_candidate_FOX1_0-uniprot.txt
CC -!- SUBCELLULAR LOCATION: Vacuole {ECO:0000256|ARBA:ARBA00004116}.
GO:0016491 oxidoreductase activity
IEA
GO_REF:0000002 		MARK AS OVER ANNOTATED
Summary: This term is true but too generic for the current BBL-family model.
Reason: The BBL family is now tied to a specific late oxidative step in nicotine synthesis, so the parent oxidoreductase term is no longer the most useful annotation.
Supporting Evidence:
file:NICAT/NaBBL1_candidate_FOX1_0/NaBBL1_candidate_FOX1_0-notes.md
The full preprint redefines BBLa as NicGS, the BBL-family enzyme that imposes stereoselective late-pathway chemistry in the nicotine synthase cascade, and supports that assignment with product-bound structural data.
GO:0050660 flavin adenine dinucleotide binding
IEA
GO_REF:0000002 		ACCEPT
Summary: FAD binding is an appropriate cofactor annotation for this BBL-family protein.
Reason: BBL-family late oxidases are flavoproteins, and UniProt explicitly assigns FAD cofactor use.
GO:0071949 FAD binding
IEA
GO_REF:0000002 		REMOVE
Summary: This is redundant with GO:0050660 and does not add information.
Reason: Keep the more standard GO:0050660 flavin adenine dinucleotide binding term and drop the redundant duplicate.
GO:0042179 nicotine biosynthetic process
IEA
GO_REF:0000041 		KEEP AS NON CORE
Summary: FOX1_0 remains a plausible nicotine-pathway paralog, but not the uniquely resolved BBL copy.
Reason: BBL-family pathway involvement is now strong, yet the exact attenuata paralog assignment remains unresolved across the FOX candidates.
Supporting Evidence:
file:NICAT/NaBBL1_candidate_FOX1_0/NaBBL1_candidate_FOX1_0-notes.md
For FOX1_0, that means the open question is paralog identity within the BBL family, not whether a BBL-like late oxidase matters in the pathway.

Core Functions

FOX1_0 is a BBL-family FAD-linked oxidoreductase candidate for the late nicotine-pathway oxidation step, but it remains one of several unresolved paralogs.

Molecular Function:
oxidoreductase activity
Directly Involved In:
nicotine biosynthetic process
Supporting Evidence:
  • file:NICAT/NaBBL1_candidate_FOX1_0/NaBBL1_candidate_FOX1_0-notes.md
    The full preprint redefines BBLa as NicGS, the BBL-family enzyme that imposes stereoselective late-pathway chemistry in the nicotine synthase cascade, and supports that assignment with product-bound structural data.

References

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Suggested Questions for Experts

Q: Is FOX1_0 catalytically active in the NicGS-like late oxidation step, or is it a noncore BBL-family duplicate?

Q: How does FOX1_0 compare with FOX1_2 and the FOX2 paralogs in root expression and metabolite-linked phenotypes?

Suggested Experiments

Experiment: Reconstitute the late nicotine pathway with FOX1_0 in place of the tobacco BBL/NicGS enzyme and test formation of stereoselective nicotine intermediates.

Hypothesis: FOX1_0 is less effective than the leading BBL anchor but may retain detectable late-pathway activity.

Type: pathway reconstitution assay

Experiment: Knock down FOX1_0 singly and in combination with other BBL-like paralogs and measure nicotine stereochemistry and intermediate accumulation.

Hypothesis: FOX1_0 contributes redundantly or secondarily within the BBL paralog set.

Type: combinatorial genetics plus metabolite profiling

Deep Research

OpenAI

(NaBBL1_candidate_FOX1_0-deep-research-openai.md)

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📚 Additional Documentation

Notes

(NaBBL1_candidate_FOX1_0-notes.md)

NaBBL1_candidate_FOX1_0 Notes

  • The full preprint redefines BBLa as NicGS, the BBL-family enzyme that imposes stereoselective late-pathway chemistry in the nicotine synthase cascade, and supports that assignment with product-bound structural data. [file:projects/NICOTINE_BIOSYNTHESIS/biorxiv-nicotine-glucosylation-notes.md "BBLa = NicGS, an (S)-nicotine glucoside synthase that drives pathway stereoselectivity"; "BBLa/NicGS was solved with FAD and with (S)-nicotine glucoside product"]
  • For FOX1_0, that means the open question is paralog identity within the BBL family, not whether a BBL-like late oxidase matters in the pathway. [file:projects/NICOTINE_BIOSYNTHESIS/biorxiv-nicotine-glucosylation-notes.md "For the NICAT project, this paper is therefore strongest for pathway-role assignment and weakest for exact paralog/accession resolution."]

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