Scribble, Lgl1, and myosin II form a complex in vivo to promote directed cell migration.

Molecular Biology of the Cell
Maha Abedrabbo, Shoshana Ravid

Abstract

Scribble (Scrib) and Lethal giant larvae 1 (Lgl1) are conserved polarity proteins that play important roles in different forms of cell polarity. The roles of Scrib and Lgl1 in apical-basal cell polarity have been studied extensively, but little is known about their roles in the cell polarity of migrating cells. Furthermore, the effect of Scrib and Lgl1 interaction on cell polarity is largely unknown. In this study, we show that Scrib, through its leucine-rich repeat domain, forms a complex in vivo with Lgl1. Scrib also forms a complex with myosin II, and Scrib, Lgl1, and myosin II colocalize at the leading edge of migrating cells. The cellular localization and the cytoskeletal association of Scrib and Lgl1 are interdependent, as depletion of either protein affects its counterpart. In addition, depletion of either Scrib or Lgl1 disrupts the cellular localization of myosin II. We show that depletion of either Scrib or Lgl1 affects cell adhesion through the inhibition of focal adhesion disassembly. Finally, we show that Scrib and Lgl1 are required for proper cell polarity of migrating cells. These results provide new insights into the mechanism regulating the cell polarity of migrating cells by Scrib, Lgl1, and myosin II.

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Citations

Aug 18, 2021·The International Journal of Biochemistry & Cell Biology·Debdatta HalderSiddhartha S Jana

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Methods Mentioned

BETA
GTPase
immunoprecipitation assay
coimmunoprecipitation
co-IP
coimmunoprecipitation assay
immunoprecipitation
solubility assay
confocal microscopy
PCR

Software Mentioned

ImageJ
Excel
GraphPad
Prism
ImageGauge

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