1 resultado para Rear-Seat Passengers.
em National Center for Biotechnology Information - NCBI
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Resumo:
To investigate myosin II function in cell movement within a cell mass, we imaged green fluorescent protein-myosin heavy chain (GFP-MHC) cells moving within the tight mound of Dictyostelium discoideum. In the posterior cortex of cells undergoing rotational motion around the center of the mound, GFP-MHC cyclically formed a “C,” which converted to a spot as the cell retracted its rear. Consistent with an important role for myosin in rotation, cells failed to rotate when they lacked the myosin II heavy chain (MHC−) or when they contained predominantly monomeric myosin II (3xAsp). In cells lacking the myosin II regulatory light chain (RLC−), rotation was impaired and eventually ceased. These rotational defects reflect a mechanical problem in the 3xAsp and RLC− cells, because these mutants exhibited proper rotational guidance cues. MHC− cells exhibited disorganized and erratic rotational guidance cues, suggesting a requirement for the MHC in organizing these signals. However, the MHC− cells also exhibited mechanical defects in rotation, because they still moved aberrantly when seeded into wild-type mounds with proper rotational guidance cues. The mechanical defects in rotation may be mediated by the C-to-spot, because RLC− cells exhibited a defective C-to-spot, including a slower C-to-spot transition, consistent with this mutant’s slower rotational velocity.