Distinct developmental roles for direct and indirect talin-mediated linkage to actin
| Autor: | Guy Tanentzapf, Tsz Ying Sylvia Cheung, Stephanie J. Ellis, Ari Franco-Cea, Lin Yuan, Michael J. Fairchild |
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| Rok vydání: | 2010 |
| Předmět: |
Talin
Integrins animal structures Embryo Nonmammalian Integrin Green Fluorescent Proteins Molecular Sequence Data Morphogenesis Arp2/3 complex macromolecular substances Focal adhesion Animals Genetically Modified 03 medical and health sciences 0302 clinical medicine Cell Adhesion Animals Drosophila Proteins Wings Animal Amino Acid Sequence Cytoskeleton Cell adhesion Molecular Biology Actin 030304 developmental biology 0303 health sciences Binding Sites Microscopy Confocal biology Sequence Homology Amino Acid Cell adhesion molecule fungi Gene Expression Regulation Developmental Cell Biology Immunohistochemistry Actins Cell biology Drosophila melanogaster Mutation biology.protein 030217 neurology & neurosurgery Developmental Biology Protein Binding |
| Zdroj: | Developmental biology. 345(1) |
| ISSN: | 1095-564X |
| Popis: | Transmembrane adhesion receptors, such as integrins, mediate cell adhesion by interacting with intracellular proteins that connect to the cytoskeleton. Talin, one such linker protein, is essential to connect extracellular matrix-bound integrins to the cytoskeleton. Talin can connect to the cytoskeleton either directly, through its actin-binding motifs, or indirectly, by recruiting other actin-binding proteins. Talin's carboxy-terminal end contains a well-characterized actin-binding domain (ABD). We tested the role of the C-terminal ABD of talin in integrin function in Drosophila. We found that introduction of mutations that reduced actin binding in vitro into the isolated C-terminal Talin-ABD impaired actin binding in vivo. Moreover, when engineered into full-length talin, these mutations disrupted a subset of integrin-mediated adhesion-dependent developmental events. Specifically, morphogenetic processes that involve dynamic, short-term integrin-mediated adhesion were particularly sensitive to impaired function of the C-terminal Talin-ABD. We propose that during development talin connects integrins to the cytoskeleton in distinct ways in different types of integrin-mediated adhesion: directly in transient adhesions and indirectly in stable long-lasting adhesions. Our results provide insight into how a similar array of molecular components can contribute to diverse adhesive processes throughout development. |
| Databáze: | OpenAIRE |
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