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'Science Across Boundaries' Abstracts 1 SCIENCE ACROSS BOUNDARIES ABSTRACTS 1 BIOLOGY) PLANT AND (CELL ANNUAL MEETING GOTHENBURG 2017 SCIENCE ACROSS BOUNDARIES ABSTRACTS 04 PC1 PLANT CELL BIOLOGY ORGANISED BY: PANAGIOTIS MOSCHOU (SWEDISH UNIVERSITY OF AGRICULTURAL SCIENCES, SWEDEN), STEPHANIE ROBERT (UMEÅ PLANT SCIENCE CENTRE, SWEDEN) AND ALYONA MININA (SWEDISH UNIVERSITY OF AGRICULTURAL SCIENCES, SWEDEN) SESSION SPONSORED BY: SWETREE TECHNOLOGIES PC1.1 DIVERSIFICATION OF PC1.2 DISSECTION OF A NOVEL MEMBRANE TRAFFICKING PATHWAYS PLANT CELL POLARITY PATHWAY DURING LAND PLANT EVOLUTION MONDAY 3 JULY, 2017 09:40 MONDAY 3 JULY, 2017 09:00 MARITZA VAN DOP (WAGENINGEN UNIVERSITY AND RESEARCH, NETHERLANDS), SAIKO YOSHIDA (NATIONAL INSTITUTE TAKASHI UEDA (NATIONAL INSTITUTE FOR BASIC FOR BASIC BIOLOGY, JAPAN), DOLF WEIJERS (WAGENINGEN BIOLOGY, JAPAN) UNIVERSITY AND RESEARCH, NETHERLANDS) [email protected] [email protected] The membrane trafficking system responsible for transporting protei n s, l ipid s, a nd polysacc ha r ides plays pivota l roles i n va r iou s In plants, cell polarity is a crucial feature involved in development, plant functions including development, defense responses, defense, reproduction and transport. Proteins are targeted i nte rcel lu la r com mu n icat ion , a nd cel l wa l l biogenesi s. T h i s system to specific domains of the cell to carry out local functions. We involves evolutionarily conserved machinery components such as discovered a family of proteins in Arabidopsis thaliana w it h u n ique R A B GT Pa ses a nd SNA R E protei n s, wh ic h reg u late tet he r i ng a nd and robust polar localization throughout plant development. SOKs membrane fusion, respectively, between transport vesicles and conta i n a wel l- con se r ved N-te r m i na l reg ion t hat we fou nd to be a dest i nat ion me mbra nes. It i s repor ted t hat t he nu mbe rs of ge nes DIX domain. The DIX domain is a protein-protein interaction module for t hese mac h i ne r y component s have been i nc rea sed du r i ng la nd known from the Dishevelled polarity regulator in animals. We found plant evolution, which could be associated with diversification t hat t he SOK DI X doma i n ca n sel f-i nte rac t a nd i s necessa r y for pola r of membrane trafficking pathways and neofunctionalization c lu ste r i ng a nd biolog ica l ac t iv it y. He re, we have u sed a bioc hem ica l a nd /or acqu i sit ion of orga nel les. For i n sig ht s i nto d ive rsi ficat ion approach to identify the context of these novel polar proteins. of the membrane trafficking system during land plant evolution, In immunoprecipitation / mass spectrometry experiments, we a re conduc t i ng compa rat ive a na lyses of me mbra ne t ra ffic k i ng we ident i fied com mon a nd d ist i nct i nteractors for t h ree fa m i ly pathways between Arabidopsis and the liverwort, Marchantia members. We fou nd t hat t he DI X doma i n is requ i red for protei n polymorpha. We have systemat ica l ly ident i fied R A B GT Pa ses a nd complex formation. At least two of the interactors are directly SNARE proteins in M. polymorpha. Some of these molecules exhibited rec r u ited to pola r sites by SOK protei n s. We a re c u r re nt ly e x plor i ng i nt r ig u i ng d i st r ibut ion a nd dy na m ics, wh ic h suggested t hat t hey the molecular and cellular function of this novel polarity module. act in unique secretion-related trafficking. Our latest results in this Taken together, our work showed that both plants and animals topic w i l l be prese nted . use the DIX domain in the context of cell polarity. Furthermore, SOK proteins allow exploring mechanisms underlying plant cell polarity establishment. ANNUAL MEETING GOTHENBURG 2017 SCIENCE ACROSS BOUNDARIES ABSTRACTS 05 stack. Plant Golgi bodies move with or over the surface of the PC1.3 TOWARDS STRUCTURAL endoplasmic reticulum in an actin-dependent manner, which INSIGHT INTO THE ENDOCYTIC adds an additional layer of tethering complexity. Golgins are a subg roup of tet he r i ng fac tors, loca l i si ng to Golg i me mbra nes a nd TPLATE ADAPTOR COMPLEX conta i n i ng long coi led- coi l doma i n s. T hese reac h i nto t he c y topla sm to bi nd to membra nes, sma l l GT Pa ses a nd ot he r tet he r i ng fac tors. MONDAY 3 JULY, 2017 09:55 Ma m ma l ia n Golg i n- 8 4 i s i nvolved i n t he reg u lat ion of ret rog rade COPI-mediated transport and maintenance of the Golgi ‘ribbon’. Two DANIEL VAN DAMME (VIB-UGENT CENTER FOR PLANT SYSTEMS ArabidopsisGolgin- 8 4 homolog ues, AtGolg i n- 8 4 A a nd AtGolg i n- BIOLOGY, BELGIUM), KLAAS YPERMAN (VIB-UGENT CENTER 8 4 B have bee n ide nt i fied , but t hei r roles re ma i n la rgely u n k now n . FOR PLANT SYSTEMS BIOLOGY, BELGIUM), JIE WANG (VIB- He re we prese nt novel data on AtGolg i n- 8 4 B. F luoresce nt f u sion s UGENT CENTER FOR PLANT SYSTEMS BIOLOGY, BELGIUM), of AtGolgin-84B and the Golgi marker STtmd were transiently JOANNA WINKLER (VIB-UGENT CENTER FOR PLANT SYSTEMS expressed in tobacco leaf epidermal cells and visualised using BIOLOGY, BELGIUM), EVELIEN MYLLE (VIB-UGENT CENTER confocal laser scanning microscopy. Over expression of GFP- FOR PLANT SYSTEMS BIOLOGY, BELGIUM), MICHAEL VANDORPE AtGolg i n- 8 4 B resu lted i n i nc rea sed c lu ste r i ng of Golg i bod ies. Upon (VIB-UGENT CENTER FOR PLANT SYSTEMS BIOLOGY, BELGIUM) treatment with the secretory inhibitor Brefeldin A (BFA), GFP- AtGolg i n- 8 4 B d i ssoc iated off Golg i membra nes before ST t md-m R F P. [email protected] A f te r prolonged BFA t reat ment, GF P-AtGolg i n- 8 4 B appea red to label the cytoplasm and surprisingly, in many cells, microtubules. Our The plant plasma membrane (PM) contains a wide range of data suggest t hat AtGolg i n- 8 4 B i s i nvolved i n retog rade t ra n spor t receptors, channels and other integral membrane proteins a nd st r uc t u ra l ma i nte na nce of pla nt Golg i bod ies. T h i s ope n s up new that mediate communication of the cell with the outside world. a nd e xc it i ng quest ion s a rou nd t he relat ion sh ip bet ween Golg i body Modu lat ion of sig na l l i ng pat hways sta r t i ng f rom t he PM requ i res st r uc t u re a nd f u nc t ion , a s wel l a s about t he nat u re of i nte rac t ion s control over the PM proteome. While anterograde secretory between Golgi bodies and microtubules. pat hways deposit PM protei n s, t hei r re mova l depe nd s on ret rog rade transport by endocytosis, in which PM material and extracellular ligands are predominantly internalized using coated vesicles. Clathrin-mediated endocytosis (CME), defined by the PC1.5 S-ACYLATION: involvement of the scaffold protein clathrin to form the cage WHAT THE FLS2 IS GOING ON? around the invaginating membrane, is the best characterized endocytic pathway in eukaryotes. Initiation of CME relies on adaptor proteins, which precisely select the cargo to be internalized, MONDAY 3 JULY, 2017 10:40 recruit the clathrin cage and facilitate membrane curvature. The identification of the TPLATE complex (TPC) as a novel CHARLOTTE H HURST (UNIVERSITY OF DUNDEE AT THE JAMES adaptor comple x reg u lat i ng C M E i n pla nt s c ha l le nges t he ge ne ra l HUTTON INSTITUTE, UNITED KINGDOM), PIERS A HEMSLEY bel ief t hat C M E i s h ig h ly con se r ved i n eu ka r yotes. T PC i s c la i med (UNIVERSITY OF DUNDEE AT THE JAMES HUTTON INSTITUTE, to represent an evolutionary ancient adaptor module which is UNITED KINGDOM) lost completely i n t he l i neage lead i ng to a n i ma l a nd f u nga l cel l s. St r uc t u ra l model i ng a nd ident i ficat ion of spec i fic protei n doma ins [email protected] led to a theoretical model of the TPC. This model shows that the TPC shares many features with the evolutionary conserved AP-2 Receptor-Like Kinases (RLK) are single pass transmembrane and COPI complexes, but also has distinct differences.
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