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lüll Phosphorylation and the Cajal body: modification in search of function Hebert MDArch Biochem Biophys 2010[Apr]; 496 (2): 69-76The Cajal body (CB) is a subnuclear domain that contains proteins and factors involved in a diverse range of activities including ribonucleoprotein maturation, histone gene transcription and telomerase assembly. Among these activities, the CBs' role in small nuclear ribonucleoprotein (snRNP) biogenesis is best characterized. Although CBs are found in plants, flies and mammals, not all cell types contain CBs. Rather, CBs are most prominent in transcriptionally active cells, such as cancer and neuronal cells. Many CB components, including the CB marker protein coilin, are phosphorylated in humans. The functional consequence of phosphorylation on CB assembly, activity and disassembly is largely unknown. Also unknown are the signaling pathways, kinases and phosphatases that act upon proteins which localize in the CB. The goal of this review is to demonstrate the need for a concerted effort towards elucidating the functional consequence of phosphorylation on CB formation and activity.|Coiled Bodies/*physiology[MESH]|Models, Biological[MESH]|Phosphorylation[MESH]|Ribonucleoproteins, Small Nuclear/*metabolism[MESH]|Signal Transduction/*physiology[MESH] |