TY  - GEN
A1  - Mao, Hailiang
A1  - Nakamura, Moritaka
A1  - Viotti, Corrado
A1  - Grebe, Markus
T1  - A framework for lateral membrane trafficking and polar tethering of the PEN3 ATP-Binding cassette transporter
T2  - Postprints der Universität Potsdam : Mathematisch Naturwissenschaftliche Reihe
N2  - The outermost cell layer of plants, the epidermis, and its outer (lateral) membrane domain facing the environment are continuously challenged by biotic and abiotic stresses. Therefore, the epidermis and the outer membrane domain provide important selective and protective barriers. However, only a small number of specifically outer membrane-localized proteins are known. Similarly, molecular mechanisms underlying the trafficking and the polar placement of outer membrane domain proteins require further exploration. Here, we demonstrate that ACTIN7 (ACT7) mediates trafficking of the PENETRATION3 (PEN3) outer membrane protein from the trans-Golgi network (TGN) to the plasma membrane in the root epidermis of Arabidopsis (Arabidopsis thaliana) and that actin function contributes to PEN3 endocytic recycling. In contrast to such generic ACT7-dependent trafficking from the TGN, the EXOCYST84b (EXO84b) tethering factor mediates PEN3 outer-membrane polarity. Moreover, precise EXO84b placement at the outer membrane domain itself requires ACT7 function. Hence, our results uncover spatially and mechanistically distinct requirements for ACT7 function during outer lateral membrane cargo trafficking and polarity establishment. They further identify an exocyst tethering complex mediator of outer lateral membrane cargo polarity.
T3  - Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe - 909 
KW  - precursor indole-3-butyric acid
KW  - GNOM ARF-GEF
KW  - plasma-membrane
KW  - exocyst complex
KW  - auxin transport
KW  - planar polarity
KW  - Arabidopsis-thaliana
KW  - fluorescent protein
KW  - soil interface
KW  - cell polarity
Y1  - 2020
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-441302
SN  - 1866-8372
IS  - 909
SP  - 2245
EP  - 2260
ER  - 
TY  - GEN
A1  - Nakamura, Moritaka
A1  - Grebe, Markus
T1  - Outer, inner and planar polarity in the Arabidopsis root
T2  - Postprints der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe
N2  - Plant roots control uptake of water and nutrients and cope with environmental challenges. The root epidermis provides the first selective interface for nutrient absorption, while the endodermis produces the main apoplastic diffusion barrier in the form of a structure called the Casparian strip. The positioning of root hairs on epidermal cells, and of the Casparian strip around endodermal cells, requires asymmetries along cellular axes (cell polarity). Cell polarity is termed planar polarity, when coordinated within the plane of a given tissue layer. Here, we review recent molecular advances towards understanding both the polar positioning of the proteo-lipid membrane domain instructing root hair initiation, and the cytoskeletal, trafficking and polar tethering requirements of proteins at outer or inner plasma membrane domains. Finally, we highlight progress towards understanding mechanisms of Casparian strip formation and underlying endodermal cell polarity.
T3  - Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe - 911 
KW  - binding cassette transporter
KW  - casparian strip formation
KW  - boric-acid channel
KW  - cell polarity
KW  - plasma-membrane
KW  - tip growth
KW  - hair development
KW  - soil interface
KW  - ROP2 GTPASE
KW  - D-galactose
Y1  - 2020
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-441266
SN  - 1866-8372
IS  - 911
SP  - 46
EP  - 53
ER  -