Expression of lacunin, a large multidomain extracellular matrix protein, accompanies morphogenesis of epithelial monolayers in Manduca sexta.
Morphogenesis is a complex process operating at several levels of organization--organism, tissues, cells, and molecules. Complex interactions occur between and within these levels. Many of the molecules that mediate these interactions are predictably turning out to be large multidomain proteins. Here we describe one such novel protein associated with remodeling of epithelial monolayers in embryos and developing wings of the moth Manduca sexta. On the basis of its sequence and its expression pattern along lacunae of developing wings, we propose the name lacunin for this extracellular matrix protein that contains nine different types of domains, most of which are present in multiple copies. These include domains of various types: Kunitz proteinase inhibitors, thrombospondin type I, immunoglobulin-like, and several newly defined domains of unknown function (PAL, PLAC, and lagrin domains). This rich patchwork of distinct domains probably exerts multiple effects on a variety of cell behaviors associated with the complex phenomenon of epithelial morphogenesis.
Nardi
J B
JB
Department of Entomology, University of Illinois, Urbana 61801, USA. j-nardi@uiuc.edu
Martos
R
R
Walden
K K
KK
Lampe
D J
DJ
Robertson
H M
HM
D000595:Amino Acid Sequence; D000818:Animals; D000911:Antibodies, Monoclonal / Q000276:immunology; D001665:Binding Sites; D017173:Caenorhabditis elegans; D004847:Epithelial Cells; D016326:Extracellular Matrix Proteins / Q000096:biosynthesis / Q000235:genetics / Q000502:physiology*; D006801:Humans; D019476:Insect Proteins; D018402:Manduca / Q000254:growth & development*; D051379:Mice; D008969:Molecular Sequence Data; D009024:Morphogenesis; D017386:Sequence Homology, Amino Acid
D000911:Antibodies, Monoclonal; D016326:Extracellular Matrix Proteins; D019476:Insect Proteins; C400463:lacunin protein, Manduca sexta