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Biochem Biophys Res Commun. 2003 Apr 11;303(3):764-70.

Association of emerin with nuclear and cytoplasmic actin is regulated in differentiating myoblasts.

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ITOI-CNR, Unit of Bologna, c/o IOR, Via di Barbiano, 1/10, I-40136 Bologna, Italy.


Emerin is a nuclear envelope protein whose biological function remains to be elucidated. Mutations of emerin gene cause the Emery-Dreifuss muscular dystrophy, a neuromuscular disorder also linked to mutations of lamin A/C. In this paper, we analyze the interaction between emerin and actin in differentiating mouse myoblasts. We demonstrate that emerin and lamin A/C are bound to actin at the late stages of myotube differentiation and in mature muscle. The interaction involves both nuclear alpha and beta actins and cytoplasmic actin. A serine-threonine phosphatase activity markedly increases emerin-actin binding even in cycling myoblasts. This effect is also observed with purified nuclear fractions in pull-down assay. On the other hand, active protein phosphatase 1, a serine-threonine phosphatase known to associate with lamin A/C, inhibits emerin-actin interaction in myotube extracts. These data provide evidence of a modulation of emerin-actin interaction in muscle cells, possibly through differentiation-related stimuli.

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