Lipid kinase that can phosphorylate both monoacylglycerol and diacylglycerol to form lysophosphatidic acid (LPA) and phosphatidic acid (PA), respectively (PubMed:15252046). Phosphorylates ceramide but not sphingosine (PubMed:15252046). Phosphorylates 1,2-dioleoylglycerol more rapidly than 2,3-dioleoylglycerol (PubMed:18004883). Independently of its lipid kinase activity, acts as a component of the TIM22 complex (By similarity). The TIM22 complex mediates the import and insertion of multi-pass transmembrane proteins into the mitochondrial inner membrane by forming a twin-pore translocase that uses the membrane potential as the external driving force (By similarity). In the TIM22 complex, required for the import of a subset of metabolite carriers into mitochondria, such as ANT1/SLC25A4 and SLC25A24, while it is not required for the import of TIMM23 (By similarity). Overexpression increases the formation and secretion of LPA, resulting in transactivation of EGFR and activation of the downstream MAPK signaling pathway, leading to increased cell growth (By similarity). a monoacylglycerol + ATP = ADP + H(+) + monoacyl-sn-glycero-3-phosphate a 1,2-diacyl-sn-glycerol + ATP = a 1,2-diacyl-sn-glycero-3-phosphate + ADP + H(+) an N-acylsphing-4-enine + ATP = ADP + an N-acylsphing-4-enine 1-phosphate + H(+) 1,2-di-(9Z-octadecenoyl)-sn-glycerol + ATP = 1,2-di-(9Z-octadecenoyl)-sn-glycero-3-phosphate + ADP + H(+) 1-(9Z-octadecenoyl)-sn-glycerol + ATP = 1-(9Z-octadecenoyl)-sn-glycero-3-phosphate + ADP + H(+) 1-(5Z,8Z,11Z,14Z-eicosatetraenoyl)-sn-glycerol + ATP = 1-(5Z,8Z,11Z,14Z-eicosatetraenoyl)-sn-glycero-3-phosphate + ADP + H(+) a 1-acyl-sn-glycerol + ATP = a 1-acyl-sn-glycero-3-phosphate + ADP + H(+) 1-hexadecanoyl-sn-glycerol + ATP = 1-hexadecanoyl-sn-glycero-3-phosphate + ADP + H(+) 2-(5Z,8Z,11Z,14Z-eicosatetraenoyl)-glycerol + ATP = 2-(5Z,8Z,11Z,14Z-eicosatetraenoyl)-sn-glycero-3-phosphate + ADP + H(+) ATP + N-(hexanoyl)sphing-4-enine = ADP + H(+) + N-hexanoylsphing-4-enine 1-phosphate Both the ceramide and diacylglycerol kinase activities are inhibited by sphingosine and stimulated by cardiolipin (PubMed:15252046). Both activities are stimulated by calcium when magnesium concentrations are low but inhibited by calcium when magnesium concentrations are high (PubMed:15252046). Lipid metabolism; glycerolipid metabolism. Component of the TIM22 complex, which core is composed of TIMM22, associated with TIMM10 (TIMM10A and/or TIMM10B), TIMM9, AGK and TIMM29. Localizes in the mitochondrion intermembrane space, where it associates with the inner membrane. It is unclear whether the N-terminal hydrophobic region forms a transmembrane region or associates with the membrane without crossing it. Ubiquitously expressed. Belongs to the AGK family. Was originally (PubMed:15252046) thought to have ceramide kinase activity. Such activity is however unlikely in vivo.