RRC ID 29056
Author Nagasaki A, Uyeda TQ.
Title DWWA, a novel protein containing two WW domains and an IQ motif, is required for scission of the residual cytoplasmic bridge during cytokinesis in Dictyostelium.
Journal Mol Biol Cell
Abstract We have identified a novel gene, dwwA, which is required for cytokinesis of Dictyostelium cells on solid surfaces. Its product, Dd WW domain containing protein A (DWWA), contains several motifs, including two WW domains, an IQ motif, a C2 domain, and a proline-rich region. On substrates, cells lacking dwwA were multinucleated and larger and flatter than wild-type cells due to their frequent inability to sever the cytoplasmic bridge connecting daughter cells after mitosis. When cultured in suspension, however, dwwA-null cells seemed to carry out cytokinesis normally via a process not driven by the shearing force arising from agitation of the culture. GFP-DWWA localized to the cell cortex and nucleus; analysis of the distributions of various truncation mutants revealed that the N-terminal half of the protein, which contains the C2 domain, is required for the cortical localization of DWWA. The IQ motif of DWWA binds calmodulin in vitro. Given that the scission process is also defective in calmodulin knockdown cells cultured on substrates (Liu et al., 1992), we propose that DWWA's multiple binding domains enable it to function as an adaptor protein, facilitating the scission process through the regulation of Ca(2+)/calmodulin-mediated remodeling of the actin cytoskeleton and/or modulation of membrane dynamics.
Volume 15(2)
Pages 435-46
Published 2004-2-1
DOI 10.1091/mbc.e03-05-0329
PII E03-05-0329
PMID 14595117
PMC PMC329203
MeSH Amino Acid Motifs / genetics Amino Acid Sequence Animals Calmodulin / metabolism* Cell Adhesion / genetics Cell Adhesion / physiology* Cell Division / genetics Cell Division / physiology* Cloning, Molecular Dictyostelium / cytology Dictyostelium / genetics Dictyostelium / metabolism* Green Fluorescent Proteins Luminescent Proteins / metabolism Molecular Sequence Data Protozoan Proteins / genetics Protozoan Proteins / metabolism*
IF 3.791
Times Cited 13
Cellular slime molds S00312 G90087