Kinase that can phosphorylate the tocopherol cyclase VTE1, a key enzyme of tocopherol (vitamin E) metabolism and involved in the recycling of oxidated alpha-tocopherol quinone, possibly stabilizing it at plastoglobules. Regulates also membrane prenylquinone composition (PubMed:23632854). Required for photooxidative stress responses to prevent photosystem II core and chlorophyll degradations. Together with ABC1K1, contributes to plastoglobule (PG) function in prenyl-lipid metabolism, stress response, and thylakoid remodeling (PubMed:23673981, PubMed:23632854). Promotes photodamage of chloroplasts under continuous red light, thus working in opposition to ABC1K1 (PubMed:25882344). ATP + L-seryl-[protein] = ADP + H(+) + O-phospho-L-seryl-[protein] ATP + L-threonyl-[protein] = ADP + H(+) + O-phospho-L-threonyl-[protein] Interacts with ABC1K1 in plastoglobules (PG) (PubMed:23673981). Interacts with PGM48 (PubMed:27895226). Colocalizes with the chlorophyll autofluorescence of mature chloroplasts. In cotyledons of seedlings grown in continuous red light, only observed in the chloroplasts losing chlorophyll autofluorescence. Suppression of the bleaching and dwarf phenotypes of plants lacking ABC1K1 in red light, associated with the rescue of chlorophylls and carotenoid contents as well as D1 protein level, product of psbA, one of the four core subunits of the photosystem II (PSII) (PubMed:25882344). Slight reduction of nonphotochemical quenching after high light intensity treatment. Abnormal chloroplast ultrastructure with slightly scattered thylakoid grana and reduced starch granules accumulation in normal light. In high light (HL), stronger phenotype with large scattered grana and extensive vacuolation as well as an increase in plastoglobule size and higher number of plastoglobule clusters, but no starch granule (PubMed:23632854). Impaired for the production of plastochromanol-8 (a plastoquinone-derived lipid antioxidant) and the redox recycling of alpha-tocopherol, but normal tocopherol. Increased accumulation of VTE1 and PAP1/FBN1a transcripts, but reduced levels of proteins fibrillin-1a (PAP1/FBN1a) and tocopherol cyclase (VTE1) due to protein instability and leading to abnormal accumulation of the alpha-tocopherol (alpha-T) oxidative- derivate alpha-tocopherol quinone (alpha-TQ) (PubMed:23632854). Conditional light stress phenotype in the double mutant abc1k1 abc1k3 that displays rapid chlorosis upon high light stress and slower, but irreversible, senescence-like phenotype during moderate light stress, drought or nitrogen limitation, but not cold stress. This senescence-like phenotype is associated with the degradation of the photosystem II core and up-regulation of chlorophyll degradation. During light stress, modified prenyl-lipid composition in plastoglobules (PG) probably due to reduced VTE1 activity and loss of CCD4, as well as abnormal recruitment of plastid jasmonate biosynthesis enzymes in PG (PubMed:23673981). Belongs to the protein kinase superfamily. ADCK protein kinase family.