Q88IK1 is a 315-aa ApbA-fold oxidoreductase assigned to
PANTHER PTHR21708:SF26 and InterPro IPR051402 (KPR-related), not to the
canonical PanE family PTHR43765/IPR050838. Its ketopantoate reaction and
pantothenate-pathway placement are computational transfers.
[file:PSEPK/PP_2998/PP_2998-uniprot.txt "DR InterPro; IPR051402;
KPR-Related."]
The same broad PANTHER subfamily includes the experimentally characterized
Pseudomonas aeruginosa PaKPR2, which has lost activity toward ketopantoate and
instead reduces several alpha-keto acids. PMID:38962820
The broad family also contains proteins annotated as bona fide ketopantoate
reductases, and PP_2998 is not the reciprocal-best-BLAST KT2440 ortholog of
PaKPR2 in OrtholugeDB. OrtholugeDB PA1752 ortholog query
The family-level evidence therefore does not resolve Q88IK1 substrate
specificity. The specific molecular-function and pantothenate-process
annotations should remain UNDECIDED pending direct biochemistry or a close
experimentally characterized ortholog.
The gene-level OpenScientist report assigns Q88IK1 as PanE from the electronic
UniProt/EC record, conserved fold features, and 28.9% identity to E. coli
PanE. It does not resolve the functional heterogeneity of PTHR21708:SF26, and
it explicitly acknowledges that no direct experiment has tested the KT2440
protein. [file:PSEPK/PP_2998/PP_2998-deep-research-openscientist.md "No direct
experimental data on the P. putida protein."]
Unlike PP_2325, Q88IK1 is not the reciprocal-best KT2440 ortholog of the
experimentally inactive PaKPR2. The available evidence therefore supports
neither confident acceptance nor confident removal of the substrate-specific
annotations. The report is retained as retrieval provenance, while the review
keeps those annotations UNDECIDED and records only the broad oxidoreductase
function as supported.