pef1
S. pombe
cyclin-dependent protein kinase Pho85/PhoA-like Pef1
What the model saw
Gene: pef1 Organism: Schizosaccharomyces pombe Known functions: cyclin-dependent protein kinase Pho85/PhoA-like Pef1. ATP binding. cyclin-dependent protein serine/threonine kinase activity. protein binding. protein kinase activity. protein serine kinase activity.
View unredacted entry
cyclin-dependent protein kinase Pho85/PhoA-like Pef1. ATP binding. cyclin-dependent protein serine/threonine kinase activity. protein binding. protein kinase activity. protein serine kinase activity.
Solver output
Pef1 is the S. pombe ortholog of budding yeast Pho85, a cyclin-dependent kinase (CDK) that functions as a central nutrient-sensing kinase. Pho85/Pef1 integrates phosphate and carbon source availability signals, phosphorylating downstream targets to promote cell cycle progression and anabolic growth under nutrient-replete conditions. In S. cerevisiae, deletion of PHO85 extends chronological lifespan by mimicking nutrient limitation and activating stress-response and autophagy pathways. As a CDK with serine/threonine kinase activity that promotes growth signaling, Pef1's normal function drives pro-growth, anti-longevity programs analogous to TOR and PKA pathways. Its activity suppresses the nutrient-limitation response that would otherwise promote longevity, placing it firmly in the deregulated nutrient-sensing hallmark of aging.
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 correctly predicted anti_longevity for pef1 in S. pombe. The mechanistic reasoning is sound and well-grounded: Pef1 is indeed the S. pombe ortholog of S. cerevisiae Pho85, a CDK involved in nutrient sensing. The model correctly draws the analogy that deletion of PHO85 in budding yeast extends chronological lifespan, and applies this logic to pef1 in fission yeast. The mechanism class of "deregulated_nutrient_sensing" is appropriate. The confidence of 0.72 is reasonable given the cross-species inference. The reasoning is detailed and biologically coherent, though it relies somewhat on extrapolation from S. cerevisiae data rather than direct S. pombe experimental evidence.
Raw API responses
solver
{
"reasoning": "Pef1 is the S. pombe ortholog of budding yeast Pho85, a cyclin-dependent kinase (CDK) that functions as a central nutrient-sensing kinase. Pho85/Pef1 integrates phosphate and carbon source availability signals, phosphorylating downstream targets to promote cell cycle progression and anabolic growth under nutrient-replete conditions. In S. cerevisiae, deletion of PHO85 extends chronological lifespan by mimicking nutrient limitation and activating stress-response and autophagy pathways. As a CDK with serine/threonine kinase activity that promotes growth signaling, Pef1's normal function drives pro-growth, anti-longevity programs analogous to TOR and PKA pathways. Its activity suppresses the nutrient-limitation response that would otherwise promote longevity, placing it firmly in the deregulated nutrient-sensing hallmark of aging.",
"confidence": 0.72,
"key_pathways": [
"Pho85/Pef1 CDK nutrient-sensing pathway",
"phosphate/carbon source signaling",
"cell cycle progression and anabolic growth signaling"
],
"mechanism_class": "deregulated_nutrient_sensing",
"longevity_influence": "anti_longevity"
}advisor
{
"notes": "The model correctly predicted anti_longevity for pef1 in S. pombe. The mechanistic reasoning is sound and well-grounded: Pef1 is indeed the S. pombe ortholog of S. cerevisiae Pho85, a CDK involved in nutrient sensing. The model correctly draws the analogy that deletion of PHO85 in budding yeast extends chronological lifespan, and applies this logic to pef1 in fission yeast. The mechanism class of \"deregulated_nutrient_sensing\" is appropriate. The confidence of 0.72 is reasonable given the cross-species inference. The reasoning is detailed and biologically coherent, though it relies somewhat on extrapolation from S. cerevisiae data rather than direct S. pombe experimental evidence.",
"failure_mode": "correct",
"answer_correct": true,
"mechanism_correct": true,
"reasoning_quality": 4,
"ground_truth_questionable": false
}