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  • 1
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    Posttranslational modification of pili upon cell contact triggers N. meningitidis dissemination (2011)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2011-02-12
    Description: The Gram-negative bacterium Neisseria meningitidis asymptomatically colonizes the throat of 10 to 30% of the human population, but throat colonization can also act as the port of entry to the blood (septicemia) and then the brain (meningitis). Colonization is mediated by filamentous organelles referred to as type IV pili, which allow the formation of bacterial aggregates associated with host cells. We found that proliferation of N. meningitidis in contact with host cells increased the transcription of a bacterial gene encoding a transferase that adds phosphoglycerol onto type IV pili. This unusual posttranslational modification specifically released type IV pili-dependent contacts between bacteria. In turn, this regulated detachment process allowed propagation of the bacterium to new colonization sites and also migration across the epithelium, a prerequisite for dissemination and invasive disease.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Chamot-Rooke, Julia -- Mikaty, Guillain -- Malosse, Christian -- Soyer, Magali -- Dumont, Audrey -- Gault, Joseph -- Imhaus, Anne-Flore -- Martin, Patricia -- Trellet, Mikael -- Clary, Guilhem -- Chafey, Philippe -- Camoin, Luc -- Nilges, Michael -- Nassif, Xavier -- Dumenil, Guillaume -- New York, N.Y. -- Science. 2011 Feb 11;331(6018):778-82. doi: 10.1126/science.1200729.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Ecole Polytechnique, Laboratoire des Mecanismes Reactionnels, Palaiseau F-91128, France.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21311024" target="_blank"〉PubMed〈/a〉
    Keywords: Bacterial Adhesion ; Cell Line, Tumor ; Epithelial Cells/microbiology ; Fimbriae Proteins/chemistry/*metabolism ; Fimbriae, Bacterial/chemistry/*metabolism ; Gene Expression Regulation, Bacterial ; Glycerol/metabolism ; Humans ; Models, Molecular ; Neisseria meningitidis/genetics/growth & development/*pathogenicity ; Phosphorylation ; Phosphotransferases/*genetics/*metabolism ; *Protein Processing, Post-Translational ; Transcription, Genetic
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 2
    Electronic Resource
    Electronic Resource
    Isolement et identification de composés à activité phéromonale chez les femelles de l'arctiide Tyria jacobaeae: Détermination biologique de la configuration absolue du composé majoritaire (1988)
    Springer
    Entomologia experimentalis et applicata 46 (1988), S. 281-289 
    Details
    ISSN: 1570-7458
    Keywords: Lepidoptera ; Arctiidae ; Sex Pheronome ; Behaviour ; Electroantennography ; Physico-chemistry ; (Z,Z)-3,6-Cis-9S,10R-epoxyheneicosadiene ; (Z,Z)-3,6-Cis-9,10-epoxyeicosadiene ; (Z,Z,Z)-3,6,9-heneicosatriene ; Lépidoptère ; Arctiidae ; Phéromone sexuelle ; Comportement ; Electroantennographie ; Physicochimie ; Epoxy-9S,10R-(Cis) hénéicosadiène-3Z,6Z ; Epoxy-9,10-(Cis) éicosadiène-3Z,6Z ; Hénéicosatriène-3Z,6Z,9Z
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Abstract The hexanic extracts from pheronomal glands of T. jacobaeae virgin females have been studied. Gas-chromatographic and mass-spectrometric analyses of the main component (no 1) (98%) in combination with behavioral and electrophysiological bioassays allowed us to determine its structure and absolue configuration: (Z,Z)-3,6-Cis-(S,R)9,10-epoxyheneicosadiene previously described in other Arctiid moths. A minor constituent (no 2) (1.5%) was identified as (Z,Z)-3,6-Cis-(S,R)9,10-epoxyeicosadiene by comparison with synthetic compound. This structure is a new one for a lepidoptera sex pheromone. The third component (no 3) of the same extracts has the same physico-chemical data as those of a previously reported constituent of another Arctiid moth: (Z,Z,Z)-3,6,9 heneicosatriene.
    Notes: Abstract Les analyses physico-chimiques d'extraits hexaniques de glandes à phéromone de femelles vierges de T. jacobaeae, associées à des études du comportement sexuel et à l'électroantennographie, ont permis d'identifier le composé majoritaire (98%) comme étant l'époxy-9S,10R-(Cis)-hénéicosadiène-3Z,6Z (no 1) et de déterminer sa configuration absolue. Les analogies entre les spectres du composé no 2 (1,5%) et ceux de l'époxy-9S,10R éicosadiène-3Z,6Z de synthèse nous conduisent à proposer cette structure pour ce constituant minoritaire. Le troisième produit (0,5%) possède les caractéristiques physico-chimiques de l'hénéicosatriène-3Z,6Z,9Z (no 3). Les produits 1 et 3 ont déjà été identifiés comme constituants de phéromones d'Arctiidae tandis que le produit 2 est décrit ici pour la première fois dans une sécrétion phéromonale de Lépidoptère.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00364200
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  • 3
    Electronic Resource
    Electronic Resource
    A peculiar fatty acid, (Z,Z)-9,12,17-octadecatrienoic acid, identified in the phospholipids of the pea aphid,Acyrthosiphon pisum (Harris) (homoptera: aphididae) (1993)
    Springer
    Cellular and molecular life sciences 49 (1993), S. 915-918 
    Details
    ISSN: 1420-9071
    Keywords: Homoptera ; Aphididae ; pea aphid ; fatty acid ; phospholipid ; (Z,Z)-9,12,17-octadecatrienoic acid ; symbiosis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract A peculiar fatty acid previously detected in the phospholipids of the pea aphid,Acyrthosiphon pisum, is identified as (Z,Z)-9,12,17-octadecatrienoic acid. It is the first report of this compound in the literature. Comparison of fatty acid profiles of phospholipids between normal and aposymbiotic pea aphids shows that aphid symbionts are not responsible for the biosynthesis of this unusual fatty acid.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01952609
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