Diversity of the Superfamily of Phloem Lectins (Phloem Protein 2) in Angiosperms

DOI PDF 5 Citations
  • Sylvie Dinant
    Laboratoire de Biologie Cellulaire, Institut National de la Recherche Agronomique, Versailles 78026, France (S.D., F.V., J.-C.P., C.K.);
  • Anna M. Clark
    University of Arizona, Department of Plant Sciences, Tucson, Arizona 85721 (A.M.C., Y.Z., G.A.T.); and
  • Yanmin Zhu
    University of Arizona, Department of Plant Sciences, Tucson, Arizona 85721 (A.M.C., Y.Z., G.A.T.); and
  • Françoise Vilaine
    Laboratoire de Biologie Cellulaire, Institut National de la Recherche Agronomique, Versailles 78026, France (S.D., F.V., J.-C.P., C.K.);
  • Jean-Christophe Palauqui
    Laboratoire de Biologie Cellulaire, Institut National de la Recherche Agronomique, Versailles 78026, France (S.D., F.V., J.-C.P., C.K.);
  • Chantal Kusiak
    Laboratoire de Biologie Cellulaire, Institut National de la Recherche Agronomique, Versailles 78026, France (S.D., F.V., J.-C.P., C.K.);
  • Gary A. Thompson
    University of Arizona, Department of Plant Sciences, Tucson, Arizona 85721 (A.M.C., Y.Z., G.A.T.); and

Description

<jats:title>Abstract</jats:title> <jats:p>Phloem protein 2 (PP2) is one of the most abundant and enigmatic proteins in the phloem sap. Although thought to be associated with structural P-protein, PP2 is translocated in the assimilate stream where its lectin activity or RNA-binding properties can exert effects over long distances. Analyzing the diversity of these proteins in vascular plants led to the identification ofPP2-like genes in species from 17 angiosperm and gymnosperm genera. This wide distribution of PP2 genes in the plant kingdom indicates that they are ancient and common in vascular plants. Their presence in cereals and gymnosperms, both of which lack structural P-protein, also supports a wider role for these proteins. Within this superfamily, PP2 proteins have considerable size polymorphism. This is attributable to variability in the length of the amino terminus that extends from a highly conserved domain. The conserved PP2 domain was identified in the proteins encoded by six genes from several cucurbits, celery (Apium graveolens), and Arabidopsis that are specifically expressed in the sieve element-companion cell complex. The acquisition of additional modular domains in the amino-terminal extensions of other PP2-like proteins could reflect divergence from its phloem function.</jats:p>

Journal

  • Plant Physiology

    Plant Physiology 131 (1), 114-128, 2003-01-01

    Oxford University Press (OUP)

Citations (5)*help

See more

Details 詳細情報について

Report a problem

Back to top