fiuA (PA0470, Q9I648) notes

Literature (own research, 2026-11-05; no deep-research provider available)

FiuA is the main outer-membrane receptor for ferric ferrichrome PMID:20047910; energy from TonB1 PMID:20047910.
Substrate range: ferrichrome-type siderophores PMID:39138320.
Regulation and signalling: produced only with ferrichrome; induced via the adjacent fiuI-fiuR ECF sigma/anti-sigma locus PMID:16484199. FiuA has an N-terminal STN signalling domain (SMART SM00965, residues 57-108), i.e. it is a TonB-dependent transducer PMID:35138377.
PMID:16484199 is abstract-only in the cache; the full text could not be retrieved in this session (PMC page access refused, Europe PMC returning 500). The earlier PA0472/foxI reviews read it and describe the regulatory experiments, not FiuA transport assays.
UniProt name problem: the unreviewed entry carries the ARBA name "Metal-pseudopaline receptor CntO" and an ARBA pseudopaline FUNCTION text; both are wrong for FiuA (recorded as a UNIPROT source defect on the UniProt reference). FoxA (Q9I116) has the same wrong name.
Consistency: PA0472 (FiuI) review describes FiuA as the ferrichrome receptor it regulates; consistent.

PseudoCAP IBA-seed assessment

PTN node	node term	n_seeds	leaf IBAs	seed annotation (term, evidence, PMID)	verdict	rationale	other seeds	IBD stands without this seed?
PTN000793005	GO:0033214 siderophore-iron import into cell	3	68 (13 taxa)	GO:0042928 ferrichrome import into cell, IMP, PMID:20047910	SOUND	Abstract states the fiuA mutant 55Fe-ferrichrome uptake result outright (80% FiuA-dependent).	E. coli Fiu P75780 (GO:0033214 IDA PMID:2139424, IMP PMID:31712312); E. coli FhuE P16869 (GO:0015687/GO:0044718 IMP PMID:31098021)	Yes; Fiu experimental rows alone support it
PTN000793005	GO:0033214 siderophore-iron import into cell	3	68 (13 taxa)	GO:0042928 ferrichrome import into cell, IMP, PMID:16484199	UNVERIFIABLE	Abstract shows proteomics and regulation only; whether a fiuA mutant transport phenotype is in the full text could not be checked. Term correct for FiuA from PMID:20047910.	as above	Yes

Other seeds were queried live in QuickGO (2026-11-05). The node is a clade of TonB-dependent siderophore receptors and the term suits it. No PseudoCAP or GO_CENTRAL defect. The same node's GO:0015344 IBD (seeded by FoxA) is assessed in genes/PSEAE/foxA/foxA-notes.md; verdicts are consistent.

Action counts

ACCEPT 10, MODIFY 3, TOO_GENERAL 2.