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EIF2AK1
eukaryotic translation initiation factor 2-alpha kinase 1
Inhibits protein synthesis at the translation initiation level, in response to various stress conditions, including oxidative stress, heme deficiency, osmotic shock and heat shock. Exerts its function through the phosphorylation of EIF2S1 at 'Ser-48' and 'Ser-51', thus preventing its recycling. Binds hemin forming a 1:1 complex through a cysteine thiolate and histidine nitrogenous coordination. This binding occurs with moderate affinity, allowing it to sense the heme concentration within the cell. Thanks to this unique heme-sensing capacity, plays a crucial role to shut off protein synthesis during acute heme-deficient conditions. In red blood cells (RBCs), controls hemoglobin synthesis ensuring a coordinated regulation of the synthesis of its heme and globin moieties. Thus plays an essential protective role for RBC survival in anemias of iron deficiency. Similarly, in hepatocytes, involved in heme-mediated translational control of CYP2B and CYP3A and possibly other hepatic P450 cytochromes. May also contain ER stress during acute heme-deficient conditions.
| Gene Name: | eukaryotic translation initiation factor 2-alpha kinase 1 |
| Family/Subfamily: | Protein Kinase , Translational Control Kinase |
| Synonyms: | EIF2AK1, Heme-regulated repressor, HRI, KIAA1369, HCR, Heme-controlled repressor, Heme-regulated inhibitor |
| Target Sequences: | NM_014413 NP_055228.2 Q9BQI3 |
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