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Zang, J.; Klemm, S.; Pain, C.; Duckney, P.; Bao, Z.; Stamm, G.; Kriechbaumer, V.; Bürstenbinder, K.; Hussey, P. J.; Wang, P.; A Novel Plant Actin-Microtubule Bridging Complex Regulates Cytoskeletal and ER Structure at Endoplasmic Reticulum-Plasma Membrane Contact Sites (EPCS) SSRN Electronic Journal (2020) DOI: 10.2139/ssrn.3581370
In plants, the cortical ER network is connected to the plasma membrane through the ER-PM contact sites (EPCS), whose structures are maintained by EPCS resident proteins and the cytoskeleton. Strong co-alignment between EPCS and the cytoskeleton is observed in plants, but little is known of how the cytoskeleton is maintained and regulated at the EPCS. Here we have used a yeast-two-hybrid screen and subsequent in vivo interaction studies in plants by FRET-FLIM analysis, to identify two microtubule binding proteins, KLCR1 (Kinesin Light Chain Related protein 1) and IQD2 (IQ67-Domain 2) that interact with the actin binding protein NET3C and form a component of plant EPCS, that mediates the link between the actin and microtubule networks. The NET3C-KLCR1-IQD2 module, acting as an actin-microtubule bridging complex, has a direct influence on ER morphology. Their loss of function mutants, net3a/NET3C RNAi, 0klcr1 or iqd2, exhibit defects in pavement cell morphology which we suggest is linked to the disorganization of both actin filaments and microtubules. In conclusion, our results reveal a novel cytoskeletal associated complex, which is essential for the maintenance and organization of both cytoskeletal structure and ER morphology at the EPCS, and for normal plant cell morphogenesis.