GCN2
S. cerevisiae
serine/threonine-protein kinase GCN2
What the model saw
Gene: GCN2 Organism: Saccharomyces cerevisiae Known functions: serine/threonine-protein kinase GCN2. ATP binding. double-stranded RNA binding. eukaryotic translation initiation factor 2alpha kinase activity. protein binding. protein homodimerization activity. protein kinase activity. protein kinase inhibitor activity. protein serine kinase activity. protein serine/threonine kinase activity. ribosomal large subunit binding. ribosome binding. tRNA binding. translation initiation factor binding.
View unredacted entry
serine/threonine-protein kinase GCN2. ATP binding. double-stranded RNA binding. eukaryotic translation initiation factor 2alpha kinase activity. protein binding. protein homodimerization activity. protein kinase activity. protein kinase inhibitor activity. protein serine kinase activity. protein serine/threonine kinase activity. ribosomal large subunit binding. ribosome binding. tRNA binding. translation initiation factor binding.
Solver output
GCN2 is the eIF2α kinase that phosphorylates the alpha subunit of eukaryotic translation initiation factor 2 (eIF2α) at Ser51 in response to amino acid deprivation (sensed via uncharged tRNA binding). This phosphorylation globally attenuates cap-dependent translation initiation, reducing protein synthesis load and activating the integrated stress response (ISR)/general amino acid control (GAAC) pathway. Reduced global translation is a well-established pro-longevity intervention in yeast and other organisms, and GCN2-mediated eIF2α phosphorylation mimics aspects of dietary restriction by signaling nutrient scarcity. The tRNA-binding and ribosome-binding activities confirm its role as a direct sensor of amino acid availability upstream of translational reprogramming. Additionally, translational attenuation via GCN2 reduces the burden on proteostasis machinery, further supporting survival under stress conditions associated with 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 predicted GCN2 as pro_longevity with 0.82 confidence, but the ground truth is anti_longevity. The model's mechanistic reasoning about GCN2's role (eIF2α kinase, amino acid sensing via uncharged tRNAs, translational attenuation, ISR/GAAC pathway) is largely accurate in terms of biochemistry. However, the model incorrectly extrapolated that translational attenuation via GCN2 would be pro-longevity in yeast. In reality, GCN2 deletion or loss-of-function studies in yeast show extended lifespan, making GCN2 anti-longevity. The model's reasoning conflates the general principle that reduced translation extends lifespan with GCN2's specific role - but GCN2 activation may actually promote aging through mechanisms such as stress-induced translational reprogramming that is net harmful for longevity in yeast. The model was confidently wrong about the direction of effect despite reasonable mechanistic knowledge of the pathway.
Raw API responses
solver
{
"reasoning": "GCN2 is the eIF2α kinase that phosphorylates the alpha subunit of eukaryotic translation initiation factor 2 (eIF2α) at Ser51 in response to amino acid deprivation (sensed via uncharged tRNA binding). This phosphorylation globally attenuates cap-dependent translation initiation, reducing protein synthesis load and activating the integrated stress response (ISR)/general amino acid control (GAAC) pathway. Reduced global translation is a well-established pro-longevity intervention in yeast and other organisms, and GCN2-mediated eIF2α phosphorylation mimics aspects of dietary restriction by signaling nutrient scarcity. The tRNA-binding and ribosome-binding activities confirm its role as a direct sensor of amino acid availability upstream of translational reprogramming. Additionally, translational attenuation via GCN2 reduces the burden on proteostasis machinery, further supporting survival under stress conditions associated with aging.",
"confidence": 0.82,
"key_pathways": [
"eIF2alpha phosphorylation / integrated stress response (ISR)",
"General amino acid control (GAAC) / GCN4 translational activation",
"Nutrient sensing and translational reprogramming under amino acid deprivation"
],
"mechanism_class": "deregulated_nutrient_sensing",
"longevity_influence": "pro_longevity"
}advisor
{
"notes": "The model predicted GCN2 as pro_longevity with 0.82 confidence, but the ground truth is anti_longevity. The model's mechanistic reasoning about GCN2's role (eIF2α kinase, amino acid sensing via uncharged tRNAs, translational attenuation, ISR/GAAC pathway) is largely accurate in terms of biochemistry. However, the model incorrectly extrapolated that translational attenuation via GCN2 would be pro-longevity in yeast. In reality, GCN2 deletion or loss-of-function studies in yeast show extended lifespan, making GCN2 anti-longevity. The model's reasoning conflates the general principle that reduced translation extends lifespan with GCN2's specific role - but GCN2 activation may actually promote aging through mechanisms such as stress-induced translational reprogramming that is net harmful for longevity in yeast. The model was confidently wrong about the direction of effect despite reasonable mechanistic knowledge of the pathway.",
"failure_mode": "confident_wrong",
"answer_correct": false,
"mechanism_correct": false,
"reasoning_quality": 3,
"ground_truth_questionable": false
}