A0A3B6GK97

PSEUDOENZYME OVERANNOTATION

Review rationale: Patatin-family acyl-ester hydrolysis depends on a Ser-Asp catalytic dyad, and mutation of the serine abolishes esterase activity (PMID:12779324). The deposited 302-residue model lacks the N-terminal catalytic region, and the gene-model analysis shows that this is not only a truncation artifact: the upstream genomic sequence that probably encodes the true N-terminus and the full-length 3B homoeolog both lack the G-T-S-T-G nucleophile elbow and the canonical DGGG oxyanion block, while intact paralogs in the same chromosome-3 cluster retain them. The protein is therefore predicted to be a non-catalytic patatin-like protein, and lipase activity is refuted. The gene review removes the electronic hydrolase activity annotation on these grounds. The lipase IBAs in the UniProt record propagate from a family-level PAINT node and do not detect this target-specific loss of the catalytic serine. No experimental data exist for this protein.

Review rationale: Lipid catabolic process is not carried by this gene in GOA; the gene has only the broader InterPro2GO lipid metabolic process annotation, which the gene review marks as over-annotated. Patatin-family membership would place the protein in lipid catabolism through acyl-ester hydrolysis, but the locus lacks the catalytic serine nucleophile and canonical oxyanion glycines, so hydrolysis by this protein cannot be assumed. A non-catalytic participant (for example a lipid-binding or regulatory role alongside the active paralogs in the same cluster) could still be involved in the process, so the absence of catalysis does not refute the term. No expression, interaction or phenotype data exist for this protein, and no literature on it was found, so the prediction can be neither validated nor refuted.