title: Schistosoma mansoni TOR is a tetraspanning orphan receptor on the parasite surface.
abstract: A trispanning orphan receptor (TOR) has been described in Schistosoma haematobium and S. mansoni. Here we report the complete molecular organization of the S. mansoni TOR gene, also known as SmCRIT (complement C2 receptor inhibitor trispanning). The SmTOR gene consists of 4 exons and 3 introns as shown by cloning the single exons from S. mansoni genomic DNA and the corresponding cDNA from the larval stage (cercaria) and the adult worm. The SmTOR ORF consists of 1260 bp and is longer than previously reported, with a fourth trans-membrane domain (proposed new name: Tetraspanning Orphan Receptor) and with, however, an unchanged C2-binding domain on the extracellular domain 1 (ed1). This domain differs in S. japonicum. A protein at the approximate expected molecular weight (55 kDa) was detected in adult worm extracts with polyclonal and monoclonal antibodies, and was found to be expressed on the tegumental surface of cercariae.
authors.affiliation: Department of Biomedicine, Immunonephrology, University Hospital Basel, Basel, Switzerland. c.lochmatter@unibas.ch
authors.forename: C
authors.initials: C
authors.lastname: Lochmatter
authors.forename: J A
authors.initials: JA
authors.lastname: Schifferli
authors.forename: P J
authors.initials: PJ
authors.lastname: Martin
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D000947:Antigens, Helminth / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D001483:Base Sequence; D003001:Cloning, Molecular; D005091:Exons / Q000235:genetics; D020869:Gene Expression Profiling; D018507:Gene Expression Regulation, Developmental; D015801:Helminth Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D006801:Humans; D007438:Introns / Q000235:genetics; D008969:Molecular Sequence Data; D011956:Receptors, Cell Surface / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D012550:Schistosoma mansoni / Q000235:genetics / Q000254:growth & development / Q000378:metabolism*; D017422:Sequence Analysis, DNA
chemical_list: D000947:Antigens, Helminth; D015801:Helminth Proteins; D011956:Receptors, Cell Surface; C120046:TM3 protein, Schistosoma