RRC ID 29090
Author Tsujioka M, Yoshida K, Nagasaki A, Yonemura S, Müller-Taubenberger A, Uyeda TQ.
Title Overlapping functions of the two talin homologues in Dictyostelium.
Journal Eukaryot Cell
Abstract Talin is a cytoskeletal protein involved in constructing and regulating focal adhesions in animal cells. The cellular slime mold Dictyostelium discoideum has two talin homologues, talA and talB, and earlier studies have characterized the single knockout mutants. talA(-) cells show reduced adhesion to the substrates and slightly impaired cytokinesis leading to a high proportion of multinucleated cells in the vegetative stage, while the development is normal. In contrast, talB(-) cells are characterized by reduced motility in the developmental stage, and they are arrested at the tight-mound stage. Here, we created and analyzed a double mutant with a disruption of both talA and talB. Defects in adhesion to the substrates, cytokinesis, and development were more severe in cells with a disruption of both talA and talB. The talA(-) talB(-) cells failed to attach to the substrates in the vegetative stage, exhibited a higher proportion of multinucleated cells than talA(-) cells, and showed more-reduced motility during the development and an earlier developmental arrest than talB(-) cells at the loose-mound stage. Moreover, overexpression of either talA or talB compensated for the loss of the other talin, respectively. The analysis of talA(-) talB(-) cells also revealed that talin was required for the formation of paxillin-rich adhesion sites and that there was another adhesion mechanism which is independent of talin in the developmental stage. This is the first study demonstrating overlapping functions of two talin homologues, and our data further indicate the importance of talin.
Volume 7(5)
Pages 906-16
Published 2008-5-1
DOI 10.1128/EC.00464-07
PII EC.00464-07
PMID 18375618
PMC PMC2394970
MeSH Animals Cell Cycle Cell Movement Cytokinesis Dictyostelium / chemistry Dictyostelium / genetics Dictyostelium / growth & development Dictyostelium / physiology* Focal Adhesions / metabolism Green Fluorescent Proteins / genetics Green Fluorescent Proteins / metabolism Life Cycle Stages Oligopeptides Peptides / genetics Peptides / metabolism Protein Isoforms / chemistry Protein Isoforms / genetics Protein Isoforms / metabolism Recombinant Fusion Proteins / chemistry Recombinant Fusion Proteins / genetics Recombinant Fusion Proteins / metabolism Talin / chemistry Talin / genetics* Talin / metabolism*
IF 2.992
Times Cited 24
Cellular slime molds S00047