Affiliation:
1. Department of Biological Sciences, University of Maryland, Baltimore County, Baltimore, MD 21250
Abstract
The ampA gene has a role in cell migration in Dictyostelium discoideum. Cells overexpressing AmpA show an increase in cell migration, forming large plaques on bacterial lawns. A second-site suppressor of this ampA-overexpressing phenotype identified a previously uncharacterized gene, ndm, which is described here. The Ndm protein is predicted to contain a coiled-coil BAR-like domain—a domain involved in endocytosis and membrane bending. ndm-knockout and Ndm-monomeric red fluorescent protein–expressing cell lines were used to establish a role for ndm in suppressing endocytosis. An increase in the rate of endocytosis and in the number of endosomes was detected in ndm−cells. During migration ndm−cells formed numerous endocytic cups instead of the broad lamellipodia structure characteristic of moving cells. A second lamellipodia-based function—cell spreading—was also defective in the ndm−cells. The increase in endocytosis and the defect in lamellipodia formation were associated with reduced chemotaxis in ndm−cells. Immunofluorescence results and glutathione S-transferase pull-down assays revealed an association of Ndm with coronin and F-actin. The results establish ndm as a gene important in regulating the balance between formation of endocytic cups and lamellipodia structures.
Publisher
American Society for Cell Biology (ASCB)
Subject
Cell Biology,Molecular Biology
Cited by
2 articles.
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