Common formin-regulating sequences in Smy1 and Bud14 are required for the control of actin cable assembly in vivo
| العنوان: | Common formin-regulating sequences in Smy1 and Bud14 are required for the control of actin cable assembly in vivo |
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| المؤلفون: | Julian A. Eskin, Aneliya Rankova, Adam B. Johnston, Bruce L. Goode, Salvatore L. Alioto |
| المصدر: | Molecular Biology of the Cell |
| سنة النشر: | 2015 |
| مصطلحات موضوعية: | 0301 basic medicine, Saccharomyces cerevisiae Proteins, Green Fluorescent Proteins, Myosin Type V, Regulator, macromolecular substances, Saccharomyces cerevisiae, Biology, Myosins, 03 medical and health sciences, Protein Domains, Myosin, Molecular Biology, Actin, Cytoskeleton, Genetics, Myosin Heavy Chains, fungi, Actin remodeling, Cell Biology, Articles, Actin cytoskeleton, Cell biology, Actin Cytoskeleton, Cytoskeletal Proteins, 030104 developmental biology, rab GTP-Binding Proteins, Formins, Mutation, biology.protein, Sequence motif, Microtubule-Associated Proteins, Function (biology) |
| الوصف: | Combined use of genetics and quantitative cell imaging reveals that Smy1 and Bud14 use common sequence motifs to directly regulate formins in vivo and thereby assemble actin cable structures of a particular shape and velocity to support efficient transport of secretory vesicles. Formins comprise a large family of proteins with diverse roles in remodeling the actin cytoskeleton. However, the spatiotemporal mechanisms used by cells to control formin activities are only beginning to be understood. Here we dissected Smy1, which has dual roles in regulating formins and myosin. Using mutagenesis, we identified specific sequences in Smy1 critical for its in vitro inhibitory effects on the FH2 domain of the formin Bnr1. By integrating smy1 alleles targeting those sequences, we genetically uncoupled Smy1’s functions in regulating formins and myosin. Quantitative imaging analysis further demonstrated that the ability of Smy1 to directly control Bnr1 activity is crucial in vivo for proper actin cable length, shape, and velocity and, in turn, efficient secretory vesicle transport. A Smy1-like sequence motif was also identified in a different Bnr1 regulator, Bud14, and found to be essential for Bud14 functions in regulating actin cable architecture and function in vivo. Together these observations reveal unanticipated mechanistic ties between two distinct formin regulators. Further, they emphasize the importance of tightly controlling formin activities in vivo to generate specialized geometries and dynamics of actin structures tailored to their physiological roles. |
| تدمد: | 1939-4586 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4c4b05c2e9aa42e36583e0b7efb1439d https://pubmed.ncbi.nlm.nih.gov/26764093 |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi.dedup.....4c4b05c2e9aa42e36583e0b7efb1439d |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 19394586 |
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