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Disease relevance of Dictyostelium


High impact information on Dictyostelium


Chemical compound and disease context of Dictyostelium


Biological context of Dictyostelium


Anatomical context of Dictyostelium

  • Identification of concanavalin A receptors and galactose-binding proteins in purified plasma membranes of Dictyostelium discoideum [20].
  • As in the well-characterized chemotactic cells Dictyostelium discoideum and neutrophils, signaling to the cytoskeleton via the phosphoinositide 3-kinase pathway in fibroblasts is spatially polarized by a PDGF gradient; however, the sensitivity of this process and how it is regulated are unknown [21].
  • Treatment of 6-h differentiated Dictyostelium discoideum cells with the nonionic detergent Triton X-100 dissolves away membranes and soluble components, as judged by marker enzyme distributions, leaving intact a cytoskeletal residue that contains approximately 10% of the cell protein and 50% of the actin [22].
  • Electron microscopic evidence demonstrated that dimethyl sulfoxide (DMSO) induces formation of giant intranuclear microfilament bundles in the interphase nucleus of a cellular slime mold, Dictyostelium [23].
  • These results suggest that a calmodulin-binding unconventional myosin is associated with contractile vacuoles in Dictyostelium; similar proteins in yeast and mammalian cells have been implicated in vesicle movement [24].

Associations of Dictyostelium with chemical compounds


Gene context of Dictyostelium

  • The ability of human and rat U3 snRNA to self-prime is consistent with a U3 secondary structure model derived by a comparison between rat U3 snRNA and the homologous D2 snRNA from Dictyostelium discoideum [30].
  • Insight into the physiological function of GSK-3 has emerged from genetic analysis in Drosophila, Dictyostelium and yeast [31].
  • Interestingly, the hCTR sequence is remotely related to the cAMP receptor of Dictyostelium discoideum (21% identical), but is not significantly related to other G protein-coupled receptor sequences now in the data bases [32].
  • One protein appears to be a yeast myosin heavy chain; it is dissociated from actin filaments by ATP, it is similar in size (200 kD) to other myosins, and antibodies directed against Dictyostelium myosin heavy chain bind to it [33].
  • One of the two subunits is the product of the CAP2 gene, which we previously identified as the gene encoding the beta subunit of capping protein based on its sequence similarity to capping protein beta subunits in chicken and Dictyostelium (Amatruda, J. F., J. F. Cannon, K. Tatchell, C. Hug, and J. A. Cooper. 1990. Nature (Lond.) 344:352-354) [34].

Analytical, diagnostic and therapeutic context of Dictyostelium

  • Single-molecule imaging techniques were used to reveal the binding of individual cyclic adenosine 3',5'-monophosphate molecules to heterotrimeric guanine nucleotide-binding protein coupled receptors on the surface of living Dictyostelium discoideum cells [35].
  • Sequence analysis of cgs2+ shows that the predicted protein it encodes shares homology with a phosphodiesterase from Dictyostelium discoideum and biochemical studies demonstrate that cells containing a mutant allele of cgs2+ have elevated levels of cAMP [36].
  • Our results provide genetic proof that in Dictyostelium the conventional myosin gene is required for growth in suspension, normal cell division and sporogenesis, and illustrate how gene targeting can be used as a tool in Dictyostelium [37].
  • The secretion of 3H-cyclic adenosine 3',5'-monophosphate (cAMP) by prelabeled and suitably differentiated Dictyostelium discoideum amoebae was elicited in a perfusion apparatus by 10(-10) to 10(-5) M [14C]cAMP stimuli of defined magnitude and duration [38].
  • These experiments will be simplified by the fact that Southern blot analyses of Dictyostelium genomic DNA are consistent with there being a single myosin I heavy-chain gene [39].


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