title: A member of the TGF-beta receptor gene family in the parasitic nematode Brugia pahangi.
abstract: The full length cDNA sequence of a Type I transforming growth factor-beta (TGF-beta) receptor has been isolated from the filarial parasitic nematode Brugia pahangi. This new gene, designated Bp-trk-1, encodes a predicted 645 amino acid sequence with an N-terminal hydrophobic stretch which may act as a signal peptide. The extracellular portion (residues 15-187) is cysteine-rich and has three potential N-glycosylation sites. At positions 250-255 the protein contains the glycine-serine rich motif characteristic of Type I receptors. The closest homologue is a Caenorhabditis elegans gene (Q09488) in cosmid C32D5.2 which shares 67% amino acid identity with Bp-trk-1 in the most conserved kinase domain (aa 259-482). Other type I receptors such as C. elegans daf-1 and Drosophila tkv show 38-53% identity in the same region. Some residues conserved in Drosophila and vertebrates are not present in the B. pahangi sequence. RT-PCR amplification has been used to show that the transcript is expressed in the three main stages of the B. pahangi life cycle: microfilariae, infective larvae and adults. The ligand remains unknown at this time but is likely to be most similar to that for C. elegans Q09488.
authors.affiliation: Institute of Cell, Animal and Population Biology, Ashworth Laboratories, University of Edinburgh, UK.
authors.forename: N
authors.initials: N
authors.lastname: Gomez-Escobar
authors.forename: A
authors.initials: A
authors.lastname: van den Biggelaar
authors.forename: R
authors.initials: R
authors.lastname: Maizels
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D017179:Brugia pahangi / Q000235:genetics* / Q000254:growth & development; D003001:Cloning, Molecular; D018076:DNA, Complementary / Q000235:genetics; D018509:DNA, Helminth / Q000235:genetics; D018507:Gene Expression Regulation, Developmental; D017238:Genes, Helminth / Q000235:genetics*; D006031:Glycosylation; D015801:Helminth Proteins; D008969:Molecular Sequence Data; D010802:Phylogeny; D017346:Protein Serine-Threonine Kinases / Q000235:genetics*; D018510:RNA, Helminth / Q000032:analysis; D012333:RNA, Messenger / Q000032:analysis; D018125:Receptors, Transforming Growth Factor beta / Q000235:genetics*; D017422:Sequence Analysis, DNA; D017386:Sequence Homology, Amino Acid
chemical_list: D018076:DNA, Complementary; D018509:DNA, Helminth; D015801:Helminth Proteins; D018510:RNA, Helminth; D012333:RNA, Messenger; D018125:Receptors, Transforming Growth Factor beta; C108876:trk-1 protein, Brugia pahangi; D017346:Protein Serine-Threonine Kinases