title: QUIRKY interacts with STRUBBELIG and PAL OF QUIRKY to regulate cell growth anisotropy during Arabidopsis gynoecium development.
abstract: Organ morphogenesis largely relies on cell division and elongation, which need to be both coordinated between cells and orchestrated with cytoskeleton dynamics. However, components that bridge the biological signals and the effectors that define cell shape remain poorly described. We have addressed this issue through the functional characterisation of QUIRKY (QKY), previously isolated as being involved in the STRUBBELIG (SUB) genetic pathway that controls cell-cell communication and organ morphogenesis in Arabidopsis. QKY encodes a protein containing multiple C2 domains and transmembrane regions, and SUB encodes an atypical LRR-receptor-like kinase. We show that twisting of the gynoecium observed in qky results from the abnormal division pattern and anisotropic growth of clustered cells arranged sporadically along the gynoecium. Moreover, the cortical microtubule (CMT) network of these cells is disorganised. A cross to botero, a katanin mutant in which the normal orientation of CMTs and anisotropic cell expansion are impaired, strongly reduces silique deviation, reinforcing the hypothesis of a role for QKY in CMT-mediated cell growth anisotropy. We also show that QKY is localised at the plasma membrane and functions in a multiprotein complex that includes SUB and PAL OF QUIRKY (POQ), a previously uncharacterised PB1-domain-containing protein that localises both at the plasma membrane and in intracellular compartments. Our data indicate that QKY and its interactors play central roles linking together cell-cell communication and cellular growth.
authors.affiliation: Laboratoire Reproduction et Développement des Plantes, Université de Lyon, CNRS, INRA, Ecole Normale Supérieure de Lyon, 46 allée d'Italie, F-69364, Lyon Cedex 07, France.
authors.forename: Christophe
authors.initials: C
authors.lastname: Trehin
authors.forename: Sandra
authors.initials: S
authors.lastname: Schrempp
authors.forename: Aurélie
authors.initials: A
authors.lastname: Chauvet
authors.forename: Annick
authors.initials: A
authors.lastname: Berne-Dedieu
authors.forename: Anne-Marie
authors.initials: AM
authors.lastname: Thierry
authors.forename: Jean-Emmanuel
authors.initials: JE
authors.lastname: Faure
authors.forename: Ioan
authors.initials: I
authors.lastname: Negrutiu
authors.forename: Patrice
authors.initials: P
authors.lastname: Morel
mesh_terms: D000595:Amino Acid Sequence; D016880:Anisotropy; D017360:Arabidopsis / Q000196:embryology* / Q000235:genetics / Q000378:metabolism; D029681:Arabidopsis Proteins / Q000235:genetics / Q000378:metabolism*; D002352:Carrier Proteins / Q000235:genetics / Q000378:metabolism*; D002450:Cell Communication; D002462:Cell Membrane / Q000378:metabolism; D018506:Gene Expression Regulation, Plant; D008565:Membrane Proteins / Q000235:genetics / Q000378:metabolism*; D008870:Microtubules; D008969:Molecular Sequence Data; D009024:Morphogenesis; D020794:Receptor Protein-Tyrosine Kinases / Q000235:genetics / Q000378:metabolism*; D016415:Sequence Alignment; D015398:Signal Transduction / Q000235:genetics
chemical_list: D029681:Arabidopsis Proteins; D002352:Carrier Proteins; D008565:Membrane Proteins; C586205:PAL OF QUIRKY protein, Arabidopsis; C538953:QUIRKY protein, Arabidopsis; D020794:Receptor Protein-Tyrosine Kinases; C503317:SUB protein, Arabidopsis
keywords: Arabidopsis thaliana; Cell-cell communication; Growth anisotropy; Gynoecium architecture; MCTP; PB1 domain; QUIRKY; STRUBBELIG