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  • 1
    ISSN: 1365-2958
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: In order to produce a successful infection, Neisseria gonorrhoeae (GC) must attach to and invade mucosal epithelial cells. To identify GC gene products involved in this early interaction with host cells we constructed a gene bank derived from a clinical isolate of GC, and isolated a clone which had the capacity to adhere to the human endometrial adenocarcinoma tissue-culture line HEC-1-B. The cloned sequence was identified as a member of the opa gene family whose protein products have been associated with virulence. The GC chromosome contains numerous variant opa genes which, in MS11, are designated opaA-K. Previous work showed that expression of opaC confers a highly invasive phenotype upon strain MS11. When our cloned opa gene was mutated and returned to the GC MS11A chromosome by transformation and homologous recombination, we isolated one transformation that was significantly reduced in its invasive capacity. The locus mutated in this transformant was identified as opaH. Our resuits indicate that invasive-ness of GC for human epithelail cells can be determined by more than one opa gene in strain MS11 A.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Osney Mead, Oxford OX2 0EL, UK : Blackwell Scientific Publication
    Molecular microbiology 17 (1995), S. 0 
    ISSN: 1365-2958
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: We have recently identified an antisense RNA (RNAα) that regulates the expression of the fatA iron transport gene encoding the outer membrane receptor for the iron-anguibactin complex. In this work, we demonstrate that RNAα also inhibits the expression of fatB, which encodes a 35 kDa iron transport protein and has domains homologous to other periplasmic transport proteins. The expression of fatA and fatB is repressed under iron-rich conditions, in which RNAα is induced. RNAα is homologous to two-thirds of the coding region of fatB. By cloning RNAα coding sequences immediately downstream of a tet promoter, we were able to obtain constitutive expression of the antisense RNA. The cloned region contains approximately 83% of the 650 nucleotide RNAα and is complementary to only 51% of the fatB mRNA but is still capable of causing a repression of the expression of the fatB gene. Our results in this work demonstrate that RNAα probably affects the stability of the fatB-specific mRNA.
    Type of Medium: Electronic Resource
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