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Myosins in the Nucleus

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Myosins

Part of the book series: Advances in Experimental Medicine and Biology ((AEMB,volume 1239))

Abstract

Although originally characterized as a cytoplasmic protein, myosin of various classes also performs key functions in the nucleus. We review the data concerning the nuclear localization, mechanism of entry, and functional interactions of myosin I, II, V, VI, X, XVI, and XVIII. To date, the first-characterized “nuclear myosin I” (or, in the prevailing nomenclature, myosin IC isoform B) remains the best-studied nuclear myosin, although results are rapidly accumulating that illuminate the roles of other myosin classes, and an outline of a unified picture of myosin functions in the nucleus is beginning to emerge. Reflecting the state of knowledge in this field, the review concentrates on the mechanisms mediating and regulating import of myosin IC into the nucleus and its role, alongside myosin V and VI, in transcription. Myosin functions in chromatin dynamics, epigenetic mechanisms, intranuclear motility, and nuclear export of RNA and protein are also addressed. Partners and regulators of myosin, such as nuclear actin, kinases, and phosphatases are briefly covered. Problem areas are identified and testable hypotheses are offered with an aim of focusing the research efforts on overcoming the gaps on the way toward a systems-level understanding of processes involving nuclear myosins and their place in cell physiology as a whole.

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Acknowledgments

Supported in part by the NCI of the National Institutes of Health under award number R21CA220155 to WAH.

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Correspondence to Wilma A. Hofmann .

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Maly, I.V., Hofmann, W.A. (2020). Myosins in the Nucleus. In: Coluccio, L. (eds) Myosins. Advances in Experimental Medicine and Biology, vol 1239. Springer, Cham. https://doi.org/10.1007/978-3-030-38062-5_10

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