Tpp2
M. musculus
tripeptidyl peptidase II
What the model saw
Gene: Tpp2 Organism: Mus musculus Known functions: tripeptidyl peptidase II. tripeptidyl-peptidase 2. aminopeptidase activity. exopeptidase activity. identical protein binding. peptide binding. serine-type endopeptidase activity. serine-type peptidase activity. tripeptidyl-peptidase activity.
View unredacted entry
tripeptidyl peptidase II. tripeptidyl-peptidase 2. aminopeptidase activity. exopeptidase activity. identical protein binding. peptide binding. serine-type endopeptidase activity. serine-type peptidase activity. tripeptidyl-peptidase activity.
Solver output
Tripeptidyl-peptidase II (TPP2) is a large serine exopeptidase that functions downstream of the 26S proteasome, cleaving tripeptides from the N-terminus of peptide fragments generated by proteasomal degradation. By facilitating the complete degradation of proteasome-generated peptides, TPP2 supports overall proteostasis and prevents accumulation of potentially toxic peptide intermediates. Loss of TPP2 function has been associated with impaired antigen processing, cellular stress responses, and accelerated cellular senescence in lymphocytes, suggesting its normal activity helps maintain proteostatic balance. Additionally, TPP2 has been implicated in DNA damage response pathways, and its deficiency in mice leads to premature immune aging and senescence phenotypes. Thus, the normal function of Tpp2 in proteolytic peptide clearance and proteostasis maintenance 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 correctly predicted pro_longevity for Tpp2. The mechanistic reasoning is well-grounded: TPP2 functions downstream of the proteasome to clear peptide fragments, supporting proteostasis. The model correctly notes that TPP2 deficiency leads to premature immune aging and senescence phenotypes in mice, which aligns with the known literature on Tpp2 knockout mice showing accelerated aging of the immune system. The reasoning is solid and the key pathways identified are appropriate. Confidence of 0.62 is reasonable given the somewhat specialized nature of this gene.
Raw API responses
solver
{
"reasoning": "Tripeptidyl-peptidase II (TPP2) is a large serine exopeptidase that functions downstream of the 26S proteasome, cleaving tripeptides from the N-terminus of peptide fragments generated by proteasomal degradation. By facilitating the complete degradation of proteasome-generated peptides, TPP2 supports overall proteostasis and prevents accumulation of potentially toxic peptide intermediates. Loss of TPP2 function has been associated with impaired antigen processing, cellular stress responses, and accelerated cellular senescence in lymphocytes, suggesting its normal activity helps maintain proteostatic balance. Additionally, TPP2 has been implicated in DNA damage response pathways, and its deficiency in mice leads to premature immune aging and senescence phenotypes. Thus, the normal function of Tpp2 in proteolytic peptide clearance and proteostasis maintenance is expected to be pro-longevity.",
"confidence": 0.62,
"key_pathways": [
"ubiquitin-proteasome peptide degradation pathway",
"proteostasis maintenance",
"cellular senescence prevention in immune cells"
],
"mechanism_class": "loss_of_proteostasis",
"longevity_influence": "pro_longevity"
}advisor
{
"notes": "The model correctly predicted pro_longevity for Tpp2. The mechanistic reasoning is well-grounded: TPP2 functions downstream of the proteasome to clear peptide fragments, supporting proteostasis. The model correctly notes that TPP2 deficiency leads to premature immune aging and senescence phenotypes in mice, which aligns with the known literature on Tpp2 knockout mice showing accelerated aging of the immune system. The reasoning is solid and the key pathways identified are appropriate. Confidence of 0.62 is reasonable given the somewhat specialized nature of this gene.",
"failure_mode": "correct",
"answer_correct": true,
"mechanism_correct": true,
"reasoning_quality": 4,
"ground_truth_questionable": false
}