PRS3
S. cerevisiae
ribose phosphate diphosphokinase subunit PRS3
What the model saw
Gene: PRS3 Organism: Saccharomyces cerevisiae Known functions: ribose phosphate diphosphokinase subunit PRS3. magnesium ion binding. protein binding. ribose phosphate diphosphokinase activity.
View unredacted entry
ribose phosphate diphosphokinase subunit PRS3. magnesium ion binding. protein binding. ribose phosphate diphosphokinase activity.
Solver output
PRS3 encodes a subunit of ribose phosphate diphosphokinase (PRPP synthetase), which catalyzes the synthesis of 5-phosphoribosyl-1-pyrophosphate (PRPP) from ribose-5-phosphate and ATP. PRPP is a central metabolite at the intersection of nucleotide biosynthesis (purines, pyrimidines, NAD+, histidine, and tryptophan pathways). Adequate PRPP production supports NAD+ biosynthesis, which is critical for sirtuin (Sir2) activity in yeast — a well-established pro-longevity pathway. Maintenance of nucleotide pools and NAD+ levels is essential for genome integrity and metabolic homeostasis, both of which decline with age. Loss of PRPP synthetase activity would impair NAD+ synthesis and purine/pyrimidine availability, compromising cellular energy sensing and repair, consistent with an anti-aging role for the normal gene function.
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 was speculative and built on a chain of assumptions (PRPP → NAD+ → Sir2 → longevity) that led to the wrong conclusion. The model reasoned that PRS3 supports NAD+ biosynthesis and sirtuin activity, making it pro-longevity, but the actual GenAge classification is anti_longevity, meaning PRS3 deletion or loss extends lifespan. The model's mechanistic reasoning was not only incorrect in its conclusion but also speculative — it assumed that PRPP synthetase activity is rate-limiting for NAD+ and sirtuin function without strong evidence. The confidence of 0.65 was moderately high for a wrong answer. The mechanism class "deregulated_nutrient_sensing" is also questionable for a ribose phosphate diphosphokinase subunit.
Raw API responses
solver
{
"reasoning": "PRS3 encodes a subunit of ribose phosphate diphosphokinase (PRPP synthetase), which catalyzes the synthesis of 5-phosphoribosyl-1-pyrophosphate (PRPP) from ribose-5-phosphate and ATP. PRPP is a central metabolite at the intersection of nucleotide biosynthesis (purines, pyrimidines, NAD+, histidine, and tryptophan pathways). Adequate PRPP production supports NAD+ biosynthesis, which is critical for sirtuin (Sir2) activity in yeast — a well-established pro-longevity pathway. Maintenance of nucleotide pools and NAD+ levels is essential for genome integrity and metabolic homeostasis, both of which decline with age. Loss of PRPP synthetase activity would impair NAD+ synthesis and purine/pyrimidine availability, compromising cellular energy sensing and repair, consistent with an anti-aging role for the normal gene function.",
"confidence": 0.65,
"key_pathways": [
"NAD+ biosynthesis and sirtuin/Sir2 activation",
"PRPP-dependent purine and pyrimidine nucleotide synthesis",
"Pentose phosphate pathway metabolite channeling"
],
"mechanism_class": "deregulated_nutrient_sensing",
"longevity_influence": "pro_longevity"
}advisor
{
"notes": "The model predicted \"pro_longevity\" but the ground truth is \"anti_longevity.\" The model's reasoning was speculative and built on a chain of assumptions (PRPP → NAD+ → Sir2 → longevity) that led to the wrong conclusion. The model reasoned that PRS3 supports NAD+ biosynthesis and sirtuin activity, making it pro-longevity, but the actual GenAge classification is anti_longevity, meaning PRS3 deletion or loss extends lifespan. The model's mechanistic reasoning was not only incorrect in its conclusion but also speculative — it assumed that PRPP synthetase activity is rate-limiting for NAD+ and sirtuin function without strong evidence. The confidence of 0.65 was moderately high for a wrong answer. The mechanism class \"deregulated_nutrient_sensing\" is also questionable for a ribose phosphate diphosphokinase subunit.",
"failure_mode": "confident_wrong",
"answer_correct": false,
"mechanism_correct": false,
"reasoning_quality": 2,
"ground_truth_questionable": false
}