alexa Nuclear actin regulates dynamic subcellular localization and activity of the SRF cofactor MAL.
Genetics

Genetics

Molecular Biology: Open Access

Author(s): Vartiainen MK, Guettler S, Larijani B, Treisman R

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Abstract Actin, which is best known as a cytoskeletal component, also participates in the control of gene expression. We report a function of nuclear actin in the regulation of MAL, a coactivator of the transcription factor serum response factor (SRF). MAL, which binds monomeric actin, is cytoplasmic in many cells but accumulates in the nucleus upon serum-induced actin polymerization. MAL rapidly shuttles between cytoplasm and nucleus in unstimulated cells. Serum stimulation effectively blocks MAL nuclear export, which requires MAL-actin interaction. Nuclear MAL binds SRF target genes but remains inactive unless actin binding is disrupted. Fluorescence resonance energy transfer analysis demonstrates that the MAL-actin interaction responds to extracellular signals. Serum-induced signaling is thus communicated to nuclear actin to control a transcriptional regulator. This article was published in Science and referenced in Molecular Biology: Open Access

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