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  • 1
    Electronic Resource
    Electronic Resource
    Isolation of monovalent sexual binding components from Chlamydomonas eugametos flagellar membranes (1980)
    Springer
    Archives of microbiology 128 (1980), S. 120-125 
    Details
    ISSN: 1432-072X
    Keywords: Chlamydomonas ; Sex ; Isoagglutination ; Membrane vesicles ; Glycoproteins ; Cell interaction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Several treatments were tested to extract the sexual binding site from membrane vesicles derived from the flagellar surface of Chlamydomonas eugametos. Extraction with detergents, chaotropic and hydrogen bond-disrupting agents, as well as sonication, was effective in reducing the isoagglutination activity of these membrane vesicles. Complementary with this reduction, a sex-specific biological activity related to isoagglutination, called “twitch activity” appeared in the extract. This was only observed with vesicles derived from minus mating type (mt-) gametes. After fractionation of the extract, one high-molecular weight glycoprotein fraction appeared to be responsible for this activity. When extracts were treated with cross-linking agents, a pelletable fraction was obtained with isoagglutinative activity. We conclude that the mt- factor, responsible for twitch activity, causes isoagglutination when it is rendered multivalent.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00422315
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Endogenous oscillator controls surface density of mating receptors in Chlamydomonas eugametos (1988)
    Springer
    Sexual plant reproduction 1 (1988), S. 46-50 
    Details
    ISSN: 1432-2145
    Keywords: Agglutinins ; Chlamydomonas ; Circadian rhythm ; Flagella ; Gametes ; Receptors(mating)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary We describe a circadian rhythm in the surface density of receptors that play a dominant role in the mating process of the unicellular green alga Chlamydomonas eugametos.These receptors — called agglutinins — are large glycoproteins extrinsically bound to the membrane of gamete flagella. We found circadian fluctuations in their density. Since inhibition of protein synthesis affected the agglutinin density without a lag period at any time,we conclude that the density was dependent on de novo synthesis and that the fluctuations in density are caused by circadian oscillations in the rate of agglutinin synthesis. This phenomenon evidently underlies the pronounced endogenous rhythm in mating competence that we described previously (Demets et al. 1987). Finally, we speculate on the nature of the time keeping mechanism that is generating these rhythmic events.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00227022
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Cell-cell adhesion in conjugatingChlamydomonas gametes: a self-enhancing process (1988)
    Springer
    Protoplasma 145 (1988), S. 27-36 
    Details
    ISSN: 1615-6102
    Keywords: Adhesion ; Agglutinin ; Chlamydomonas ; Flagellum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The flagellar adhesiveness of gametes ofChlamydomonas eugametos increases during conjugation such that the cell-cell contacts are intensified. The rise in adhesiveness is due to an increase in agglutinin exposure which can be visualized by immunolabeling. The adhesiveness in the one cell is stimulated by the agglutinins of the adherent partner cell, and vice versa. Thus, sexual cell-cell adhesion is a self-enhancing process. In addition, it is shown that the gametes are able to activate potential partners at distance via agglutinin-rich vesicles which they shed into their environment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01323253
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    Paper (German National Licenses)
    Fulltext
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