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Preprints

Dahiya, P.; Haluška, S.; Buhl, J.; Kölling, M.; Papsdorf, S.; Zehnich, D.; Machalett, K.; Pfeiffer, P.; Stamm, G.; Potocký, M.; Bürstenbinder, K.; Origin and evolution of IQD scaffolds and assembled protein complexes in plant cell division SSRN Electronic Journal (2023) DOI: 10.2139/ssrn.4655235
  • Abstract
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In ancestors of modern-day streptophyte algae, cell division has undergone a switch from a cleavage-like mode to an inside-out mechanism, in which new cell walls are inserted at the cell center and expand centrifugally, eventually fusing with the maternal cell wall at a specific cortical region, termed cortical division zone (CDZ) 1-3. This switch in cell division involved the stepwise evolution of two novel cytoskeleton arrays, the phragmoplast and preprophase band (PPB). The PPB/phragmoplast system possibly provided basis for tunable cell division orientation, which enabled 3D development and morphological adaptations required for successful colonization of terrestrial habitats4. How the cytoskeleton acquired its novel functions, however, is still largely enigmatic. Our previous work identified IQ67-DOMAIN8 (IQD8) of Arabidopsis thaliana as an important determinant of PPB formation and division plane positioning5,6. IQD8 is an intrinsically disordered scaffold protein that interacts with core components of the CDZ7. Here, through phylogenetic and functional analyses, we show that IQDs emerged in the last common ancestor of Klebsormidiophyceae and Phragmoplastophyta algae. Gradual changes in motif composition and acquisition likely facilitated functional diversification of IQDs in terms of subcellular localization and protein-protein interactions. Cross-complementation studies in Arabidopsis mutants provide evidence for evolutionarily conserved functions of land-plant IQDs as key regulators of PPB formation and division plane control. In summary, our work establishes IQDs as plant-specific scaffold proteins, which likely played a role in rewiring and neofunctionalization of protein-protein interaction networks at distinct subcellular sites to facilitate evolutionary adaptations of the cell division apparatus and microtubule cytoskeleton in general.

Preprints

Dahiya, P.; Haluška, S.; Buhl, J.; Kölling, M.; Papsdorf, S.; Zehnich, D.; Machalett, K.; Pfeiffer, P.; Stamm, G.; Potocký, M.; Bürstenbinder, K.; Origin and evolution of IQD scaffolds and assembled protein complexes in plant cell division SSRN Electronic Journal (2023) DOI: 10.2139/ssrn.4655235
  • Abstract
  • Internet
  • BibText
  • RIS

In ancestors of modern-day streptophyte algae, cell division has undergone a switch from a cleavage-like mode to an inside-out mechanism, in which new cell walls are inserted at the cell center and expand centrifugally, eventually fusing with the maternal cell wall at a specific cortical region, termed cortical division zone (CDZ) 1-3. This switch in cell division involved the stepwise evolution of two novel cytoskeleton arrays, the phragmoplast and preprophase band (PPB). The PPB/phragmoplast system possibly provided basis for tunable cell division orientation, which enabled 3D development and morphological adaptations required for successful colonization of terrestrial habitats4. How the cytoskeleton acquired its novel functions, however, is still largely enigmatic. Our previous work identified IQ67-DOMAIN8 (IQD8) of Arabidopsis thaliana as an important determinant of PPB formation and division plane positioning5,6. IQD8 is an intrinsically disordered scaffold protein that interacts with core components of the CDZ7. Here, through phylogenetic and functional analyses, we show that IQDs emerged in the last common ancestor of Klebsormidiophyceae and Phragmoplastophyta algae. Gradual changes in motif composition and acquisition likely facilitated functional diversification of IQDs in terms of subcellular localization and protein-protein interactions. Cross-complementation studies in Arabidopsis mutants provide evidence for evolutionarily conserved functions of land-plant IQDs as key regulators of PPB formation and division plane control. In summary, our work establishes IQDs as plant-specific scaffold proteins, which likely played a role in rewiring and neofunctionalization of protein-protein interaction networks at distinct subcellular sites to facilitate evolutionary adaptations of the cell division apparatus and microtubule cytoskeleton in general.

Books and chapters

Klemm, S.; Buhl, J.; Möller, B.; Bürstenbinder, K.; Quantitative analysis of microtubule organization in leaf epidermis pavement cells Hussey, P.J., Wang, P. The Plant Cytoskeleton 2604 43-61 (2023) ISBN:978-1-0716-2866-9 DOI: 10.1007/978-1-0716-2867-6_4
  • Abstract
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Leaf epidermis pavement cells form highly complex shapes with interlocking lobes and necks at their anticlinal walls. The microtubule cytoskeleton plays essential roles in pavement cell morphogenesis, in particular at necks. Vice versa, shape generates stress patterns that regulate microtubule organization. Genetic or pharmacological perturbations that affect pavement cell shape often affect microtubule organization. Pavement cell shape and microtubule organization are therefore closely interconnected. Here, we present commonly used approaches for the quantitative analysis of pavement cell shape characteristics and of microtubule organization. In combination with ablation experiments, these methods can be applied to investigate how different genotypes (or treatments) affect the organization and stress responsiveness of the microtubule cytoskeleton.

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