Academic Journal
Localization of the meningococcal receptors for human transferrin
| العنوان: | Localization of the meningococcal receptors for human transferrin |
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| المؤلفون: | Ala'Aldeen, D A, Powell, N B, Wall, R A, Borriello, S P |
| المصدر: | Infection and Immunity ; volume 61, issue 2, page 751-759 ; ISSN 0019-9567 1098-5522 |
| بيانات النشر: | American Society for Microbiology |
| سنة النشر: | 1993 |
| الوصف: | The interaction between gold-labelled human transferrin (Au-HTF) with live meningococci after growth in vivo or in different in vitro conditions was examined by electron microscopy to localize and quantify the numbers of HTF-binding sites on the cell surface. It was clearly demonstrated that HTF binds to the surface of live meningococci (of different serogroups and serotypes) after growth in either iron-sufficient or iron-restricted cultures, although the degree of labelling was always higher (2- to 35-fold) in the latter case. The commensal Neisseria polysaccharea behaved similarly. Ultrathin sections showed that Au-HTF was localized predominantly on the outer membrane of the cells and vesicles, with hardly any internalization. Au-HTF labelling on meningococci was significantly reduced after incubation with unlabelled HTF or with rabbit antiserum containing antibodies against transferrin-binding proteins (TBPs), demonstrating the specificity of the interaction. These sera also blocked binding between HTF and outer membrane proteins on Western immunoblots. Direct evidence of the expression of the TBPs (Western blots) and localization of the HTF receptor (electron microscopy) on in vivo-grown meningococci was obtained from organisms derived without laboratory culturing from the cerebrospinal fluid of a patient. There was considerable cell-to-cell variation in the amount of labelling present on cells of the same sample (in vitro- or in vivo-grown organisms) and between different strains. The degree of binding varied with time of incubation of the cells with Au-HTF. The gold particles frequently formed discrete circles on the cell surfaces of the in vitro-grown organisms; these circles appear to be associated with outer membrane vesicle formation. The results show that the TBPs, which form part of the active components of the HTF receptor(s), are expressed in vivo and are surface exposed and immunogenic and that antibodies against them can interfere with the HTF binding of the meningococcal cells, which may affect ... |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| DOI: | 10.1128/iai.61.2.751-759.1993 |
| الاتاحة: | http://dx.doi.org/10.1128/iai.61.2.751-759.1993 https://journals.asm.org/doi/pdf/10.1128/iai.61.2.751-759.1993 |
| Rights: | https://journals.asm.org/non-commercial-tdm-license |
| رقم الانضمام: | edsbas.6C5C7BDF |
| قاعدة البيانات: | BASE |
| DOI: | 10.1128/iai.61.2.751-759.1993 |
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