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PubMedDate not supplied

[The functional similarity of vertebrate rhodopsin and of a photosensitive pigment from the unicellular flagellate alga Chlamydomonas reinhardtii].

Photoreceptor membranes in the bovine retina may be substituted in reconstructed systems by pigment fractions from Chlamydomonas reinhardtii which account for GTP-dependent activation of cGMP-phosphodiesterase. Fractions from carotinoid-less mutant did not exhibit this capacity. The results obtained reveal significant structural and functional similarity between rhodopsin-like pigment of Ch. reinhardtii and rhodopsin from vertebrates.

3',5'-Cyclic-GMP Phosphodiesterases↗
PubMed1989

Effect of gossypol on the morphology, motility and metabolism of a flagellated protist, Dunaliella bioculata.

Gossypol, a natural polyphenolic compound extracted from cotton seed, is known for its contraceptive properties on human beings and several other mammals. Gossypol induces disorders of spermatogenesis and inhibition of spermatozoal motility. To determine the molecular mechanism inhibiting the motility of cells, a flagellar protist (Dunaliella bioculata) has been chosen as a cellular model because of the heterogeneity of spermatozoa populations. Inhibition of cell motility by gossypol, measured by Laser Doppler Velocimetry, was observed with these cells at the same doses as for spermatozoa (30-50 mumoles/l). Mitochondria were found to be swollen in gossypol-treated algae and, in parallel, respiratory exchanges were decreased and photosynthesis was inhibited, although the chloroplast did not seem to be morphologically altered. A diminution of the essential ATP production was also found at the same doses. Therefore, the inhibition of flagellar motility could be explained by such a decrease. The rapid and parallel inhibition of respiration and photosynthesis at non-lethal concentrations leads us to the hypothesis of a common target involving both ubiquinone and plastoquinone, although this remains to be proved.

Adenosine Triphosphate↗
PubMed1988

[Polyacrylamide gel electrophoresis of cellular proteins from parasitic flagellates of the order Trichomonadida].

Some Trichomonas hominis and Dientamoeba fragilis strains were compared by electrophoretic patterns of total proteins from trophozoites. Easily distinguished patterns divided T. hominis in different types. Significant differences were also seen comparing T. hominis and D. fragilis whilst among strains of D. fragilis electrophoretic protein patterns were mostly found to be accordant.

Animals↗
PubMed1977

The first multi-flagellate spermatozoa in the animal kingdom, discovered in Mastotermes darwiniensis.

In this paper the spermatozoa of Mastotermes darwiniensis is described. It is the first example of multiflagellate animal sperm cell, consisting of a conical head and about hundred flagella. Other remarkable features are the absence of acrosome, the centrioles made up by doublets instead of triplets and the axonemes devoid of central tubules and with doublets bearing only one arm. The flagella are feebly motile.

Animals↗