title: The allergens of Parietaria.
abstract: Parietaria is a genus of dicotyledonous weeds of the Urticaceae family including several species and its pollen grain is one of the most important allergenic sources in the Mediterranean area. Species belonging to this genus induce IgE responses in approximately 10 million people. Identification of allergens by means of independent strategies suggest that the allergens of the two more common species, Parietaria judaica and Parietaria Officinalis, show molecular weights ranging between 10 and 14 kD and that the allergens of the two extracts are highly cross-reactive. Biochemical analysis and molecular cloning allowed the isolation and immunological characterization of the two major allergens of the P. judaica pollen, Par j 1 and Par j 2. Sequence comparison suggests that the P j major allergens of P. Judaica belong to the nonspecific lipid transfer protein family, and three-dimensional modeling by homology has revealed that both proteins present a very conserved structural motif composed of four alpha-helices. Immunological analysis has shown that Par j 1 and Par j 2 are able to bind most of the P. Judaica-specific IgE and some of their IgE determinants have been mapped. Recombinant Par j 1 and Par j 2 allergens have been shown to possess immunological properties equivalent to their natural counterpart and their availability represents a fundamental tool for the diagnosis and therapy of Parietaria pollen allergy.
authors.affiliation: Istituto di Biomedicina e di Immunologia Molecolare Alberto Monroy del Consiglio Nazionale delle Ricerche, Palermo, Italy. paolo.colombo@ibim.cnr.it
authors.forename: Paolo
authors.initials: P
authors.lastname: Colombo
authors.forename: Angela
authors.initials: A
authors.lastname: Bonura
authors.forename: Maria
authors.initials: M
authors.lastname: Costa
authors.forename: Vincenzo
authors.initials: V
authors.lastname: Izzo
authors.forename: Rosa
authors.initials: R
authors.lastname: Passantino
authors.forename: Giovanni
authors.initials: G
authors.lastname: Locorotondo
authors.forename: Saverio
authors.initials: S
authors.lastname: Amoroso
authors.forename: Domenico
authors.initials: D
authors.lastname: Geraci
mesh_terms: D000485:Allergens / Q000737:chemistry* / Q000235:genetics; D000595:Amino Acid Sequence; D001402:B-Lymphocytes / Q000276:immunology; D003001:Cloning, Molecular; D000939:Epitopes / Q000737:chemistry / Q000235:genetics; D006801:Humans; D019083:Mediterranean Region; D008958:Models, Molecular; D008969:Molecular Sequence Data; D032403:Parietaria / Q000235:genetics / Q000276:immunology*; D011058:Pollen / Q000235:genetics / Q000276:immunology; D006255:Rhinitis, Allergic, Seasonal / Q000209:etiology; D017386:Sequence Homology, Amino Acid
chemical_list: D000485:Allergens; D000939:Epitopes