Falcon (Edison Scientific) deep research report on S. pombe alo1 (Q9HDX8), synthesizing ortholog enzymology and enzyme-family mechanism.
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The best-supported functional model is a FAD-dependent aldonolactone oxidase that oxidizes D-arabinono-1,4-lactone to D-erythroascorbate using O2 as the terminal electron acceptor, contributing to an ascorbate-like antioxidant system; for S. pombe this is inferred from orthologs rather than directly demonstrated.
"A FAD-dependent aldonolactone oxidase that oxidizes D-arabinono-1,4-lactone to D-erythroascorbate, using O2 as the terminal electron acceptor"
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Purified budding-yeast ALO has a relaxed substrate specificity, oxidizing D-arabinono-1,4-lactone, L-gulono-1,4-lactone and L-galactono-1,4-lactone, supporting the UniProt alternative name L-galactono-gamma-lactone oxidase.
"Purified budding-yeast ALO oxidized **D-arabinono-1,4-lactone**, **L-gulono-1,4-lactone**, and **L-galactono-1,4-lactone**"
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ALO is a flavoenzyme with covalently bound FAD (covalent histidyl-FAD in fungal/animal oxidase-type enzymes), consistent with the oxygen-dependent FAD-linked oxidoreductase family assigned to Q9HDX8.
"ALO is a **flavoenzyme** with **covalently bound FAD**"
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In S. cerevisiae, ALO was purified from the mitochondrial fraction and predicted to be an integral membrane protein, supporting a mitochondrial membrane localization; falcon retrieved no direct localization data for the S. pombe protein.
"ALO was purified from the **mitochondrial fraction**"
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Genetic disruption of S. cerevisiae ALO1 abolished detectable D-erythroascorbate and ALO activity while multicopy ALO1 increased EASC ~6.9-fold and ALO activity ~7.3-fold; alo1 mutants were hypersensitive to H2O2 and menadione.
"alo1 mutants** were hypersensitive to **H2O2** and **menadione**"
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Falcon found no primary experimental paper directly characterizing the S. pombe SPAPB1A10.12c/Q9HDX8 protein; S. pombe-specific functional conclusions beyond the UniProt description must be treated as ortholog-based inference, and ALO1 in S. cerevisiae (YML086C) should not be conflated with S. pombe alo1.
"no primary experimental paper directly characterizing the S. pombe SPAPB1A10.12c/Q9HDX8 protein"