Existing Annotations Review

GO Term	Evidence	Action	Reason
GO:0016491 oxidoreductase activity	IBA GO_REF:0000033	ACCEPT	Summary: Accept: oxidoreductase activity. Reason: Laccases are multicopper oxidases, so the general oxidoreductase parent is correct; the hydroquinone:oxygen oxidoreductase term below is the informative molecular function.
GO:0005507 copper ion binding	IEA GO_REF:0000002	ACCEPT	Summary: Accept: copper ion binding. Reason: The multicopper centre is essential to laccase catalysis, so copper binding here is a genuine cofactor requirement rather than an incidental metal-binding match.
GO:0005576 extracellular region	IEA GO_REF:0000044	ACCEPT	Summary: Accept: extracellular region. Reason: The conidial laccase acts at the spore surface after secretion, so an extracellular compartment is what the pigment-maturation step requires.
GO:0016491 oxidoreductase activity	IEA GO_REF:0000002	ACCEPT	Summary: Accept: oxidoreductase activity. Reason: Sequence-similarity route to the same general oxidoreductase parent as the IBA row; redundant.
GO:0042440 pigment metabolic process	IEA GO_REF:0000117	ACCEPT	Summary: Accept: pigment metabolic process. Reason: YA converts the WA polyketide precursor into the mature green conidial pigment, which makes pigment metabolism the correct process for this terminal step of conidial pigmentation.
GO:0052716 hydroquinone:oxygen oxidoreductase activity	IEA GO_REF:0000120	ACCEPT	Summary: Accept: hydroquinone:oxygen oxidoreductase activity. Reason: The laccase-level activity predicted from the multicopper oxidase domains. This is the specific molecular function, and it is independently supported by the direct enzyme assay below.
GO:0005576 extracellular region	ISS GO_REF:0000024	ACCEPT	Summary: Accept: extracellular region. Reason: Curator sequence-similarity assignment of the same secreted location; concordant with the electronic call.
GO:0052716 hydroquinone:oxygen oxidoreductase activity	ISS GO_REF:0000024	ACCEPT	Summary: Accept: hydroquinone:oxygen oxidoreductase activity. Reason: Curator sequence-similarity assignment of laccase activity; concordant with both the domain-based prediction and the direct enzyme assay.
GO:0043324 pigment metabolic process involved in developmental pigmentation	IMP PMID:4624671 Absence of laccase from yellow-spored mutants of Aspergillus...	ACCEPT	Summary: Core process. yA acts in developmental conidial pigmentation. Reason: yA is required for the developmental green pigmentation of conidia. Supporting Evidence: PMID:4624671 Absence of laccase from yellow-spored mutants of Aspergillus nidulans
GO:0048315 conidium formation	IMP PMID:4624671 Absence of laccase from yellow-spored mutants of Aspergillus...	MARK AS OVER ANNOTATED	Summary: Over-annotation. yA is required for conidial pigmentation, not for conidium formation itself. Reason: yellow-spored (yA) mutants form morphologically normal conidia that are simply the wrong colour; the phenotype is pigmentation, not formation. GO:0043324 (pigment metabolic process involved in developmental pigmentation), annotated and accepted above, captures the demonstrated role. Supporting Evidence: PMID:4624671 Absence of laccase from yellow-spored mutants of Aspergillus nidulans
GO:0052716 hydroquinone:oxygen oxidoreductase activity	IDA PMID:4624671 Absence of laccase from yellow-spored mutants of Aspergillus...	ACCEPT	Summary: Core molecular function (direct). Conidial laccase (hydroquinone:oxygen oxidoreductase) activity. Reason: Direct assay of the purified conidial laccase demonstrates the diphenol-oxidase activity. Supporting Evidence: PMID:4624671 Absence of laccase from yellow-spored mutants of Aspergillus nidulans
GO:0052716 hydroquinone:oxygen oxidoreductase activity	IMP PMID:4624671 Absence of laccase from yellow-spored mutants of Aspergillus...	ACCEPT	Summary: Core molecular function. Laccase activity (mutant evidence). Reason: yellow-spored (yA) mutants lack laccase, linking the gene to the activity. Supporting Evidence: PMID:4624671 Absence of laccase from yellow-spored mutants of Aspergillus nidulans
GO:0052716 hydroquinone:oxygen oxidoreductase activity	IDA PMID:7000747 Developmental regulation of laccase levels in Aspergillus ni...	ACCEPT	Summary: Accept: hydroquinone:oxygen oxidoreductase activity. Reason: Direct enzymological evidence for the developmentally regulated conidial laccase - the assay that defines YA, and the strongest row in this set.

Core Functions

Conidial laccase (copper-dependent p-diphenol oxidase): yA catalyzes the final oxidation of the wA-derived naphthopyrone precursor to the mature green conidial pigment; yA mutants are yellow.

Molecular Function:

hydroquinone:oxygen oxidoreductase activity

Directly Involved In:

pigment metabolic process involved in developmental pigmentation

Cellular Locations:

extracellular region

Supporting Evidence:

PMID:4624671
Absence of laccase from yellow-spored mutants of Aspergillus nidulans

References

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Notes

(yA-notes.md)

yA (Aspergillus nidulans) — curation notes

UniProt P17489 (LAC1_EMENI / yA). Conidial laccase (p-diphenol oxidase); structural-output tier.
- Copper laccase converting the wA-derived precursor to the mature green pigment; yellow (yA) mutants lack laccase. PMID:4624671.
- Core MF GO:0052716 hydroquinone:oxygen oxidoreductase activity (IDA). Acts downstream of the wA PKS.

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