Function
Serine/threonine-protein kinase which phosphorylates the alpha subunit of eukaryotic translation-initiation factor 2 (eIF2alpha), leading to its inactivation and thus to a rapid reduction of translational initiation and repression of global protein synthesis (By similarity). Involved in the unfolded protein response (UPR) triggered by several stresses including mitochondrial, osmotic and oxidative stresses, amino acid deprivation and UV irradiation, probably by phosphorylating and inhibiting eIF2alpha (PubMed:20733002, PubMed:23076791, PubMed:22719267, PubMed:23692540). In addition, leads to the selective translation/transcription of some mRNA including atf-5, pha-4 and gpdh-1 which are part of the UPR (PubMed:23076791, PubMed:23692540). Required for maintaining lifespan during amino acid starvation (PubMed:23692540). Involved in hypoxia-mediated adaptive protective response (PubMed:20733002).
Sequence
MTKENQIVLDERVKENQHLQEEEKLALDAVYLNQITYIKAHWHVWVPTNCHILLKALDSCFLNGDPLGKSKLSVILHVKCSEDYPQRKPAVDLLDPQGLSKEDVQNLLTILRQMADTWEGCVVIAELAHRVREFLTDHTPRPAGSFHDDMLANKVRTEAEKQRKRLDTEQKELELLEEEMRQRNAIEMEKTLNGTRQENETRIIGGRRIVVLSNMPNTQLLISEWTFRFSSNRNPAEGKRKDFAPFLQKLDAVYNEIQKLCEIKGLDQNLVEYAFVHLQKISVSPDQILIQLNVAQKIFSSEENMQDTYELIVQKSNLLRLLAAQAICGLRYLHEASMTHKHLTLGSVWTRNSTGDCVFRFSDFGSMGPLLDLVKMFGDICSGKYVARDEDKEKEYDRRRKDLFQLGTLLDGLILATRGSTYSRVPTPVEGNQNTGTNLLGNFIAKCQEAKNIDQLVEDPFLKEECQSESENIFTPFGGAMSPDGRMLADNVIIRVLGRGGFGDVVLVRNKMDSTDYAIKRIPLNAKSDKLNRKIAKEAKFFAKLNHPNMVRYYYAWAEDLIPIVEETSDDDSSLGAVPIPGKEKIGKKGKLKTGKSLEDKENKANLGGGDSLMPMNLRGLVKDHSIGVDAKEWSTPFGKPEGPKCASRMRQSKRSTPSGGLKHLSECSSDDEDDDDSSEIDWDAESEEVEDEESDDSDEEDEDDGERLVQLNTETSTGADSVFERSTADEDVVFTAESEDLNAKRRESIELMEINTTTTSKSKLAIDVVPVRKPRILCIQMEYCDRATLRQYIDENHCFNAPTEVWRIFSEVLCGLKYMHDMAMIHRDIKPLNIFLTSQNGVKIGDFGLATLEAMSSKGKIVGGAAEKSTSIEAMLSPNGVKSKGSDVHQTRDIGTQLYMAPELFVDELVHKAPYTSKIDIYSAGVVLFEMFYRPLPPSMDRVSTLNNLRDDIKIPSDFGAGLAAPMAGLARRTVEKMLQRNPDERPTADDLLNDEDLPMHTKEDATFRNLCEKVIKKRDGRMNAWLLDKQFKEEVPTSLNYCYDVDICLERAKYNNREVLVETLRAEFCKILKIHSFEKLHTHTLMPVSTALAAASVRTKPVEVLDRSGVPVALPMDLRQNFVRFCVRNSVQRMKRFNFGRVYSQTSANGHPHERWECCVDCIGPQCSSPSLEAELLLVACEMMIGSLPGMKFTLKIGHAQLIEAQIRHLKLSDDVRAELLDALHLISVSDRPHSHKEKMDMLTPKIGAKAANIITKLLIPVEDNFGAFKEKVACFRKKLKVDAARVLVDKAIRDLEEIVGTFKFCRTEAIEQISIVYDSQTCYRPRTFGDGLLFQIQVEKPSTIANNKRGRRQNVLAGGRYDSALLRERHPRDFVYEIPLCISGFGVAMDVVSQIRDSINKSANIPKTPQNHCKVLICSMVQPDGSNLITQKFELAKKLWSMGIEADVFHIPVDDLESLTEHRNRASITHILAVYNTLNEVICKTETSSETMDVDSAISSVWRGVQALDGQSIHMTPCGGGPISSISTPGEAHHHDDHHPGTPVIASKCFRSSVSTTVATTSIRPISATVANLNVILVTSADRFHKVMKEKKRVESQVRNHLTEFVAHFTSKTRIEVLVCDIPADVIKKIVSELTKTSSEAEIDKLFDQLIQKHGKVDLSPLRRQFHITLNGISTGSAQVAILFYRQSDNFYRYLV