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Termin: 22.11.2019 Uhrzeit: 12:00 - 13:00

Botanisches Kolloquium | Evolution and Functional Diversification od EXO70 Subunits of Exocyst Complex in Land Plants

Kolloquium
Referent/in: Prof. Viktor Žárský, Department of Experimental Plant Biology, Faculty of Science, Charles University, 12800 Prague, Czech Republic
Inhalt:

Thema: Evolution and Functional Diversification od EXO70 Subunits of Exocyst Complex in Land Plants

Localized delivery of plasma membrane (PM) and cell wall components is an essential process in all plant cells. The vesicle tethering complex exocyst, an ancient eukaryotic hetero-octameric protein cellular module, assists in targeted delivery of exocytosis vesicles to specific PM domains as an effector of small Rab and Rho GTPases. Analyses of Arabidopsis and later other land plant genomes lead to the surprising prediction of multiple putative EXO70 exocyst subunit paralogs (Synek et al. 2006). The sheer number of paralogues and their extraordinary evolutionary dynamics is calling for functional explanation; in Arabidopsis and rice genomes 23 resp. 47 EXO70 subunits are encoded (Cvrčková et al. 2012). All land plant EXO70 exocyst subunits (including Bryophytes) form three distinct subfamilies – EXO70.1, EXO70.2 and EXO70.3. EXO70.1 subfamily represented by EXO70A isoforms is the least evolutionarily dynamic one, closely related to single EXO70 subunits encoded in fungal and animal genomes. The exocyst research both in plants and animals was transformed substantially by independent discoveries of exocyst complex version involvement in the autophagy process in metazoans and plants (Bodemann et al. 2011; Kulich et al. 2013). Based on data accumulated over the last 10 years on the isoforms of subfamily EXO70.2 (esp. EXO70B1, EXO70B2, EXO70C2, EXO70E2, EXO70H1 and EXO70H4) we will show a new perspective implicating this subfamily members in often unconventional secretory processes related to autophagy, secondary metabolites transport, cell growth regulation, secondary cell wall biogenesis/modification and defence. Engagement of EXO70.2 class of EXO70s in biotic interactions and defence correlates well with enormous production and conservation of new protein variants within this subfamily of exocyst EXO70 subunits. Acknowledgement: this work is supported by the GACR/CSF project 19-02242J and MSMT proj. OPVVV “Cent. Exp. Biol. Plant” - CZ.oz.1.01/0.0/0.0/16-019/0000738.

Öffentliche Veranstaltung: Ja
Adresse: Nussallee 4
Raum: Hörsaal
Veranstalter: Universität Bonn
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