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Title: A regulatory motif in nonmuscle myosin II-B regulates its role in migratory front-back polarity.
Issue Date: 13-Apr-2015
Citation: J. Cell Biol..2015 Apr;(209)1:23-32
Abstract: In this study, we show that the role of nonmuscle myosin II (NMII)-B in front-back migratory cell polarity is controlled by a short stretch of amino acids containing five serines (1935-1941). This motif resides near the junction between the C terminus helical and nonhelical tail domains. Removal of this motif inhibited NMII-B assembly, whereas its insertion into NMII-A endowed an NMII-B-like ability to generate large actomyosin bundles that determine the rear of the cell. Phosphomimetic mutation of the five serines also inhibited NMII-B assembly, rendering it unable to support front-back polarization. Mass spectrometric analysis showed that several of these serines are phosphorylated in live cells. Single-site mutagenesis showed that serine 1935 is a major regulatory site of NMII-B function. These data reveal a novel regulatory mechanism of NMII in polarized migrating cells by identifying a key molecular determinant that confers NMII isoform functional specificity.
PMID: 25869664
Rights: openAccess
Appears in Collections:Fundaciones e Institutos de Investigación > IIS H. U. La Princesa > Artículos

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