Direct binding between two PDZ domain proteins Canoe and ZO-1 and their roles in regulation of the jun N-terminal kinase pathway in Drosophila morphogenesis

Mech Dev. 1998 Nov;78(1-2):97-111. doi: 10.1016/s0925-4773(98)00151-8.


During Drosophila embryogenesis, the ventral epidermis dorsally expands and the left and right epithelial sheets meet and fuse along the dorsal midline. For this dorsal closure to occur, two PDZ domain proteins, Cno and ZO-1, are required. The dorsal epidermis remains open when the expression of ZO-1 and Cno are reduced simultaneously by hypomorphic mutations in the relevant loci. ZO-1 and Cno colocalize at adherens junctions in embryonic epithelia, and form a protein complex upon binding to each other. Genetic analysis showed that Cno is involved in the Jun N-terminal kinase (JNK) pathway for dorsal closure, as a modulator acting upstream of, or in parallel with, the small GTPase Drac1. The ZO-1-Cno complex may be involved in dynamic changes in cytoskeletal organization and cell adhesion during morphogenetic events associated with dorsal closure in the Drosophila embryo.

MeSH terms

  • Animals
  • Animals, Genetically Modified
  • Calcium-Calmodulin-Dependent Protein Kinases / physiology*
  • Cell Adhesion / genetics
  • Cytoskeleton / ultrastructure
  • Drosophila Proteins*
  • Drosophila melanogaster / embryology
  • Drosophila melanogaster / genetics*
  • Embryo, Nonmammalian / metabolism
  • Embryo, Nonmammalian / ultrastructure
  • Epidermis / embryology
  • Epidermis / metabolism
  • GTP-Binding Proteins / physiology
  • In Situ Hybridization
  • Insect Proteins / biosynthesis
  • Insect Proteins / genetics
  • Insect Proteins / metabolism
  • Insect Proteins / physiology*
  • JNK Mitogen-Activated Protein Kinases
  • Macromolecular Substances
  • Membrane Proteins / genetics
  • Membrane Proteins / metabolism
  • Membrane Proteins / physiology*
  • Mitogen-Activated Protein Kinases*
  • Morphogenesis / genetics
  • Phosphoproteins / genetics
  • Phosphoproteins / metabolism
  • Phosphoproteins / physiology*
  • Protein Binding
  • Recombinant Fusion Proteins / metabolism
  • Saccharomyces cerevisiae / genetics
  • Zonula Occludens-1 Protein
  • rac GTP-Binding Proteins*


  • Drosophila Proteins
  • Insect Proteins
  • Macromolecular Substances
  • Membrane Proteins
  • Phosphoproteins
  • Rac1 protein, Drosophila
  • Recombinant Fusion Proteins
  • Zonula Occludens-1 Protein
  • cno protein, Drosophila
  • dpp protein, Drosophila
  • Calcium-Calmodulin-Dependent Protein Kinases
  • JNK Mitogen-Activated Protein Kinases
  • Mitogen-Activated Protein Kinases
  • GTP-Binding Proteins
  • rac GTP-Binding Proteins