Abstract
The cDNA corresponding to a fourth species of diacylglycerol (DG) kinase (EC 2.7.1.107) was isolated from cDNA libraries of rat retina and brain. This cDNA encoded a 929-aa, 104-kDa polypeptide termed DGK-IV. DGK-IV was different from previously identified mammalian DG kinase species, DGK-I, DGK-II, and DGK-III, in that it contained no EF-hand motifs but did contain four ankyrin-like repeats at the carboxyl terminus. These structural features of DGK-IV closely resemble the recently cloned, eye-specific DG kinase of Drosophila that is encoded by the retinal degeneration A (rdgA) gene. However, DGK-IV was expressed primarily in the thymus and brain with relatively low expression in the eye and intestine. Furthermore, the primary structure of the DGK-IV included a nuclear targeting motif, and immunocytochemical analysis revealed DGK-IV to localize in the nucleus of COS-7 cells transfected with the epitope-tagged cDNA, suggesting an involvement of DGK-IV in intranuclear processes.
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