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DdLIM Is a Cytoskeleton-associated Protein Involved in the Protrusion of Lamellipodia in Dictyostelium

By Josef Prassler, Alexander Murr, Susanne Stocker, Jan Faix, John Murphy and Gerard Marriott


DdLim, a multi-domain member of the cysteine-rich family of LIM domain proteins, was isolated from Dictyostelium cells where it localizes in lamellipodia and at sites of membrane ruffling. The transcription and expression of DdLim are developmentally regulated, and the timing of its increased association with the actin cytoskeleton coincides with the acquisition in starved cells of a motile, chemotactic behavior. Vegetative cells that overexpress DdLim contain large lamella and exhibit ruffling at the cortex. The high frequency of large, multinucleated mutant cells found in suspension culture suggests that excess DdLim interferes with cytokinesis. DdLim was also identified as a protein in a Dictyostelium cell lysate that associated indirectly, but in a guanosine triphosphate-dependent manner, with a GST-rac1 fusion protein. The data presented suggest that DdLim acts as an adapter protein at the cytoskeleton-membrane interface where it is involved in a receptor-mediated rac1-signaling pathway that leads to actin polymerization in lamellipodia and ultimately cell motility

Topics: Article
Publisher: The American Society for Cell Biology
Year: 1998
DOI identifier: 10.1091/mbc.9.3.545
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Provided by: PubMed Central
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