Catalyzes the ATP-dependent phosphorylation of sn-l,2-diacylglycerol (DAG) to phosphatidic acid. Involved in the recycling of diacylglycerol produced as a by-product during membrane-derived oligosaccharide (MDO) biosynthesis. a 1,2-diacyl-sn-glycerol + ATP = a 1,2-diacyl-sn-glycero-3-phosphate + ADP + H(+) Belongs to the bacterial diacylglycerol kinase family. Was originally thought to originate from Pseudomonas denitrificans, but similarity searches show that the sequence is much closer to Sinorhizobium. The entry's taxonomy has been changed.