Sla2p is associated with the yeast cortical actin cytoskeleton via redundant localization signals.

Department of Molecular and Cell Biology, University of California, Berkeley, California 94720-3202, USA.
Sla2p, also known as End4p and Mop2p, is the founding member of a widely conserved family of actin-binding proteins, a distinguishing feature of which is a C-terminal region homologous to the C terminus of talin. These proteins may function in actin cytoskeleton-mediated plasma membrane remodeling. A human homologue of Sla2p binds to huntingtin, the protein whose mutation results in Huntington's disease. Here we establish by immunolocalization that Sla2p is a component of the yeast cortical actin cytoskeleton. Deletion analysis showed that Sla2p contains two separable regions, which can mediate association with the cortical actin cytoskeleton, and which can provide Sla2p function. One localization signal is actin based, whereas the other signal is independent of filamentous actin. Biochemical analysis showed that Sla2p exists as a dimer in vivo. Two-hybrid analysis revealed two intramolecular interactions mediated by coiled-coil domains. One of these interactions appears to underlie dimer formation. The other appears to contribute to the regulation of Sla2p distribution between the cytoplasm and plasma membrane. The data presented are used to develop a model for Sla2p regulation and interactions.
Mesh Terms:
Actins, Base Sequence, Carrier Proteins, Cell Division, Cytoskeletal Proteins, Cytoskeleton, DNA-Binding Proteins, Dimerization, Endocytosis, Fungal Proteins, Gene Deletion, Molecular Sequence Data, Mutation, Recombinant Proteins, Saccharomyces cerevisiae Proteins, Signal Transduction, Yeasts
Mol. Biol. Cell Jul. 01, 1999; 10(7);2265-83 [PUBMED:10397764]
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