file:DROME/Mtpalpha/Mtpalpha-hypotheses/function-hypothesis-go-0005777/openscientist.md

OpenScientist function-assignment hypothesis: Mtpalpha (Q8IPE8) peroxisome (GO:0005777)

Independent AI-scientist analysis (run blinded to our review action) supports the peroxisome annotation for Q8IPE8, identifying a Drosophila-lineage-conserved C-terminal SKL PTS1 (absent from vertebrate HADHA) and isoform-dependent targeting, with the shorter Q8IPE8 isoform lacking the N-terminal mitochondrial presequence present on the longer Q9V397 isoform.

"which lacks a mitochondrial targeting sequence (MTS) and was directly demonstrated to localize to peroxisomes by fluorescence microscopy"

Gene Ontology annotation through association of InterPro records with GO terms

Manual transfer of experimentally-verified manual GO annotation data to orthologs by curator judgment of sequence similarity

GO_REF:0000044

Gene Ontology annotation based on UniProtKB/Swiss-Prot Subcellular Location vocabulary mapping, accompanied by conservative changes to GO terms applied by UniProt

GO_REF:0000116

Automatic Gene Ontology annotation based on Rhea mapping

GO_REF:0000120

Combined Automated Annotation using Multiple IEA Methods

PMID:16212416

Characterization of the Drosophila melanogaster mitochondrial proteome.

2D-gel/MALDI-TOF characterization of the Drosophila larval mitochondrial proteome; supports mitochondrial localization of Mtpalpha (HDA).

PMID:19317464

Mapping organelle proteins and protein complexes in Drosophila melanogaster.

LOPIT mass-spectrometry organelle map of Drosophila embryos; supports mitochondrial localization of Mtpalpha (HDA).

PMID:19884309

Genetic screen in Drosophila melanogaster uncovers a novel set of genes required for embryonic epithelial repair.

Forward-genetics transposon-insertion screen for embryonic epithelial repair that recovered 30 lethal insertional mutants; the FlyBase HMP wound-healing annotation on Mtpalpha derives from this screen. The abstract foregrounds karst/beta-Heavy-spectrin, DJUN and scab and does not name Mtpalpha.

PMID:22342726

Impaired fatty acid oxidation in a Drosophila model of mitochondrial trifunctional protein (MTP) deficiency.

Generated Drosophila Mtpalpha(KO) and Mtpbeta(KO) flies. Mtpalpha(KO) flies are viable but show reduced lifespan, defective locomotion and reduced fecundity, are hypersensitive to fasting with retained fat-body lipid droplets, and accumulate acylcarnitine and hydroxyacylcarnitine, demonstrating impaired long-chain fatty acid beta-oxidation. Directly supports GO:0006635 (IMP) and the non-core lifespan / starvation-response phenotypes.

PMID:22758915

An inventory of peroxisomal proteins and pathways in Drosophila melanogaster.

Proteomic/bioinformatic inventory of Drosophila peroxisomal proteins; source of the peroxisome localization annotations (IDA/ISS/ISM) for Mtpalpha. Confirmed the localization of five predicted peroxisomal proteins.

file:DROME/Mtpalpha/Mtpalpha-uniprot.txt

UniProt entry Q8IPE8 (Mtpalpha, Trifunctional enzyme subunit alpha, mitochondrial)

TrEMBL record documenting the two-domain architecture (crotonase enoyl-CoA hydratase + NAD-binding 3-hydroxyacyl-CoA dehydrogenase), EC 4.2.1.17 and EC 1.1.1.211, the alpha2/beta2 heterotetramer, and mitochondrial inner membrane / fatty acid beta-oxidation pathway assignments (mostly ARBA/electronic).