PDX3
S. cerevisiae
pyridoxamine-phosphate oxidase PDX3
What the model saw
Gene: PDX3 Organism: Saccharomyces cerevisiae Known functions: pyridoxamine-phosphate oxidase PDX3. FMN binding. oxidoreductase activity, acting on the CH-NH2 group of donors. pyridoxamine phosphate oxidase activity.
View unredacted entry
pyridoxamine-phosphate oxidase PDX3. FMN binding. oxidoreductase activity, acting on the CH-NH2 group of donors. pyridoxamine phosphate oxidase activity.
Solver output
PDX3 encodes pyridoxamine-phosphate oxidase, an FMN-dependent enzyme that catalyzes the oxidation of pyridoxamine-5'-phosphate (PMP) and pyridoxine-5'-phosphate (PNP) to pyridoxal-5'-phosphate (PLP), the active form of vitamin B6. PLP is an essential cofactor for over 100 enzymatic reactions, including transamination, decarboxylation, and one-carbon metabolism. Adequate PLP availability supports amino acid metabolism, neurotransmitter synthesis, and critically, the transsulfuration pathway (cystathionine β-synthase and γ-lyase are PLP-dependent), which generates hydrogen sulfide (H₂S) and cysteine — both linked to stress resistance and longevity in yeast. Loss of PDX3 function would reduce PLP levels, impairing these downstream pathways and increasing cellular stress. Additionally, vitamin B6 (PLP) has antioxidant properties, and its deficiency is associated with increased oxidative damage. Therefore, PDX3's role in maintaining PLP homeostasis is expected to be pro-longevity.
GenAge curators classify each gene's normal function as promoting (Pro-Longevity) or opposing (Anti-Longevity) longevity, based on synthesis across studies. Loss-of-function effects can vary from this depending on the manipulation.
Advisor judgment
The model predicted pro_longevity but the ground truth is anti_longevity. The model's reasoning about PDX3's biochemical function (pyridoxamine-phosphate oxidase converting PMP/PNP to PLP) is accurate, and the downstream pathways mentioned are plausible. However, the model incorrectly assumed that maintaining PLP homeostasis would be pro-longevity. In yeast, PDX3 appears to have an anti-longevity effect, meaning its deletion or loss extends lifespan. The model's logic that "loss of PDX3 would reduce PLP levels and increase cellular stress" is reasonable but leads to the wrong conclusion. The actual anti-longevity classification suggests that PDX3 activity may promote aging, possibly through mechanisms not considered by the model (e.g., PLP-dependent reactions that accelerate aging processes, or the oxidase activity generating reactive byproducts). The model was fairly confident (0.72) in the wrong direction.
Raw API responses
solver
{
"reasoning": "PDX3 encodes pyridoxamine-phosphate oxidase, an FMN-dependent enzyme that catalyzes the oxidation of pyridoxamine-5'-phosphate (PMP) and pyridoxine-5'-phosphate (PNP) to pyridoxal-5'-phosphate (PLP), the active form of vitamin B6. PLP is an essential cofactor for over 100 enzymatic reactions, including transamination, decarboxylation, and one-carbon metabolism. Adequate PLP availability supports amino acid metabolism, neurotransmitter synthesis, and critically, the transsulfuration pathway (cystathionine β-synthase and γ-lyase are PLP-dependent), which generates hydrogen sulfide (H₂S) and cysteine — both linked to stress resistance and longevity in yeast. Loss of PDX3 function would reduce PLP levels, impairing these downstream pathways and increasing cellular stress. Additionally, vitamin B6 (PLP) has antioxidant properties, and its deficiency is associated with increased oxidative damage. Therefore, PDX3's role in maintaining PLP homeostasis is expected to be pro-longevity.",
"confidence": 0.72,
"key_pathways": [
"Vitamin B6 (PLP) biosynthesis/salvage pathway",
"Transsulfuration pathway (PLP-dependent)",
"Oxidative stress resistance"
],
"mechanism_class": "other",
"longevity_influence": "pro_longevity"
}advisor
{
"notes": "The model predicted pro_longevity but the ground truth is anti_longevity. The model's reasoning about PDX3's biochemical function (pyridoxamine-phosphate oxidase converting PMP/PNP to PLP) is accurate, and the downstream pathways mentioned are plausible. However, the model incorrectly assumed that maintaining PLP homeostasis would be pro-longevity. In yeast, PDX3 appears to have an anti-longevity effect, meaning its deletion or loss extends lifespan. The model's logic that \"loss of PDX3 would reduce PLP levels and increase cellular stress\" is reasonable but leads to the wrong conclusion. The actual anti-longevity classification suggests that PDX3 activity may promote aging, possibly through mechanisms not considered by the model (e.g., PLP-dependent reactions that accelerate aging processes, or the oxidase activity generating reactive byproducts). The model was fairly confident (0.72) in the wrong direction.",
"failure_mode": "confident_wrong",
"answer_correct": false,
"mechanism_correct": false,
"reasoning_quality": 3,
"ground_truth_questionable": false
}