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  • 1
    ISSN: 1617-4623
    Keywords: Secretion of proteins ; Gram-negative bacteria ; E. coli haemolysin ; Alkaline phosphatase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Alkaline phosphatase (AP) is secreted into the medium when the carboxy-terminal 25 amino acids are replaced by the 60 amino acid carboxy-terminal signal peptide (HlyAs) ofEscherichia coli haemolysin (HlyA). Secretion of the AP-HlyAs fusion protein is dependent on HlyB and HlyD but independent of SecA and SecY. The efficiency of secretion by HlyB/HlyD is decreased when AP carries its own N-terminal signal peptide. Translocation of this fusion protein into the periplasm is not observed even in the absence of HlyB/HlyD. The failure of the Sec export machinery to transport the latter protein into the periplasm seems to be due in part to the loss of the carboxy-terminal sequence of AP since even AP derivatives which do not carry the HlyA signal peptide but lack the 25 C-terminal amino acids of AP are localized in the membrane but not translocated into the periplasm.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1617-4623
    Keywords: Escherichia coli haemolysin ; Secretion ; HlyA signal sequence ; Fusion proteins
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary We studied the efficiency of the pHly152-derived haemolysin transport system using PhoA-HlyA fusion proteins and different constructs which provide HlyB/HlyD in trans. The optimal C-terminal HlyA signal consists of the last 60 amino acids. Longer stretches of HlyA do not improve the transport efficiency of PhoA-HlyA fusion proteins. The introduction of deletions and/or replacements in the 60 amino acid HlyA signal domain revealed at least three functional regions with different degrees of specificity. Amino acids 1–21 (numbered from the N-terminal part of the 60 amino acid HlyA signal), termed region I, could be replaced by a Pro-containing peptide. The other two regions II and III (amino acids 22–40 and 41–60, respectively) seem to interact directly with the HlyB/HlyD translocator since a PhoA fusion protein which contains either of the two regions was still secreted in a HlyB/HlyD-dependent mode, albeit at low efficiency. An efficient trans-complementing HlyB/HlyD system was only obtained from the pHLy152-encoded hly determinant when the regulatory hlyR element was provided in cis. Secretion of the PhoA-HlyA fusion protein did not interfere with the secretion of HlyA even when the fusion protein was induced to a high level. This suggests that the capacity of the HlyB/HlyD translocation system is high and not normally saturated by its natural HlyA substrate.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    ISSN: 1365-2222
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Allergy 45 (1990), S. 0 
    ISSN: 1398-9995
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Sera from 204 adult patients with chronic airways obstruction were analysed with the Phadiatop®, a new allergosorbent test with a paper disc containing the most relevant inhalant allergens, the PRIST for total IgE determinations, and a panel of seven RAST tests with the common inhalant allergens in The Netherlands as reference. The aim was to evaluate the Phadiatop as screening test in the in vitro diagnostic procedures in an epidemiological setting. The Phadiatop was classified positive or negative according to percentage binding, total IgE was considered elevated at values 〉 100 kU/1 and the RAST panel positive when at least one RAST result was class 〉 1. The prevalence of inhalant atopy came to 27.9%. The predictive value of the Phadiatop for a positive RAST panel was 96.4%, and for a negative RAST panel 97.3%. For the PRIST these values were 51.9% and 87.2% respectively. The correlation between the log percentages binding of the Phadiatop and the RAST panel was 0.93. It is concluded that the Phadiatop is a valuable test for the screening of inhalant atopy, and as the percentage binding of the Phadiatop may reflect the degree of sensitization it could also be applied as a quantitative measure especially for epidemiological purposes.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Fluid Mechanics 22 (1990), S. 255-274 
    ISSN: 0066-4189
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Type of Medium: Electronic Resource
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