title: [The sbr gene product in Drosophila melanogaster and its orthologs in yeast (Mex67p) and human (TAP)].
abstract: A DNA sequence from the 9F region of Drosophila melanogaster polytene chromosomes was cloned. Sequencing the cloned region and its comparison with the known sequences of the D. melanogaster genome showed that the cloned DNA part contains gene sbr and adjacent sequences. The literature data on the structure and functions of genes TAP in humans and Mex67 in yeast are discussed. These genes are orthologous to the sbr gene of Drosophila and control mRNA export from the nucleus to the cytoplasm. The literature evidence is consistent with the recessive expression of mutation l(1)ts403 (sbr10) upon heat treatment that is manifested as impaired HSP synthesis at the posttranscriptional level. However, it fails to explain the semidominant effect of the mutation manifested in high frequency of meiotic sex-chromosome nondisjunction in heat-treated females. A comparison of amino-acid sequences corresponding to the products of the three orthologous genes, TAP, Mex67, and sbr, showed that the sbr gene product of Drosophila is more similar to the human TAP factor than to the Mex67 factor in yeast.
authors.affiliation: Department of Genetics and Breeding, St. Petersburg State University, St. Petersburg, 199034 Russia.
authors.forename: I V
authors.initials: IV
authors.lastname: Tret'iakova
authors.forename: G T
authors.initials: GT
authors.lastname: Lezin
authors.forename: E G
authors.initials: EG
authors.lastname: Markova
authors.forename: M B
authors.initials: MB
authors.lastname: Evgen'ev
authors.forename: L A
authors.initials: LA
authors.lastname: Mamon
mesh_terms: D000071181:ATP Binding Cassette Transporter, Subfamily B, Member 2; D018528:ATP-Binding Cassette Transporters; D000595:Amino Acid Sequence; D000818:Animals; D003001:Cloning, Molecular; D018076:DNA, Complementary / Q000032:analysis / Q000235:genetics; D004331:Drosophila melanogaster / Q000235:genetics*; D017344:Genes, Insect; D016678:Genome; D015894:Genome, Human; D006801:Humans; D008969:Molecular Sequence Data; D009154:Mutation; D009687:Nuclear Proteins / Q000235:genetics*; D029543:Nucleocytoplasmic Transport Proteins; D016601:RNA-Binding Proteins / Q000235:genetics*; D012441:Saccharomyces cerevisiae / Q000235:genetics*; D029701:Saccharomyces cerevisiae Proteins; D016415:Sequence Alignment; D017421:Sequence Analysis
chemical_list: D000071181:ATP Binding Cassette Transporter, Subfamily B, Member 2; D018528:ATP-Binding Cassette Transporters; D018076:DNA, Complementary; C106898:MEX67 protein, S cerevisiae; D009687:Nuclear Proteins; D029543:Nucleocytoplasmic Transport Proteins; D016601:RNA-Binding Proteins; D029701:Saccharomyces cerevisiae Proteins; C073119:TAP1 protein, human
vernacular_title: Produkty gena sbr u Drosophila melanogaster i ego ortologi u drozhzheĭ (Mex67p) i cheloveka (TAP).