Myosin XI localizes at the mitotic spindle and along the cell plate during plant cell division in Physcomitrella patens
| Autor: | Hao Sun, Luis Vidali, Fabienne Furt |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
0106 biological sciences
0301 basic medicine Cell division Recombinant Fusion Proteins Green Fluorescent Proteins Biophysics Spindle Apparatus macromolecular substances Myosins Phragmoplast Microtubules 01 natural sciences Biochemistry 03 medical and health sciences Cell Wall Gene Expression Regulation Plant Genes Reporter Plant Cells Myosin Protein Isoforms Cytoskeleton Interphase Molecular Biology Mitosis Metaphase Cytokinesis Plant Proteins Chemistry Cell Biology Cell plate Actins Bryopsida Spindle apparatus Cell biology Actin Cytoskeleton 030104 developmental biology rab GTP-Binding Proteins SNARE Proteins 010606 plant biology & botany |
| Zdroj: | Biochemical and Biophysical Research Communications. 506:409-421 |
| ISSN: | 0006-291X |
| Popis: | Cell division is a fundamental biological process that has been extensively investigated in different systems. Similar to most eukaryotic cells, plant cells assemble a mitotic spindle to separate replicated chromosomes. In contrast, to complete cell division, plant cells assemble a phragmoplast, which is composed of aligned microtubules and actin filaments. This structure helps transport vesicles containing new cell wall material, which then fuse to form the cell plate; the cell plate will expand to create the new dividing cell wall. Because vesicles are known to be transported by myosin motors during interphase, we hypothesized this could also be the case during cell division and we investigated the localization of the plant homologue of myosin V - myosin XI, in cell division. In this work, we used the protonemal cells of the moss Physcomitrella patens as a model, because of its simple cellular morphology and ease to generate transgenic cell lines expressing fluorescent tagged proteins. Using a fluorescent protein fusion of myosin XI, we found that, during mitosis, this molecule appears to associate with the kinetochores immediately after nuclear envelope breakdown. Following metaphase, myosin XI stays associated with the spindle's midzone during the rest of mitosis, and when the phragmoplast is formed, it concentrates at the cell plate. Using an actin polymerization inhibitor, latrunculin B, we found that the association of myosin XI with the mitotic spindle and the phragmoplast are only partially dependent on the presence of filamentous actin. We also showed that myosin XI on the spindle partially overlaps with a v-SNARE vesicle marker but is not co-localized with the endoplasmic reticulum and a RabA vesicle marker. These observations suggest an actin-dependent and an actin-independent behavior of myosin XI during cell division, and provide novel insights to our understanding of the function of myosin XI during plant cell division. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect