Riboflavin Synthesis in Cultures of Physarum Polycephalum
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Differential protein synthesis during sporulation in the slime mold Physarum polycephalum.
The size distribution and synthesis of polypeptide chains and the polysome patterns were studied during sporulation of the slime mold Physarum polycephalum, and were compared with nonsporulating controls. The proteins were divided into a 27,000 x g supernatant (buffer-soluble proteins) and a pellet (buffer-insoluble proteins) while still native. The sodium dodecyl sulfate complexes of the denat...
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In extracts from both growing and differentiating (spherulating) plasmodia of the true slime mold Physarum polycephalum, high aminopeptidase activities were found. The specificity of the aminopeptidases changed during differentiation with a higher relative activity towards hydrophobic NH2-terminal amino acids. This change in specificity was found to be the result of a shift in the isoenzyme spe...
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A method has been developed for growing Physarum polycephalum plasmodia that are 8 to 10 times larger than those obtained in the petri dish cultures used by Nygaard, Guttes, and Rusch. In the large-scale procedure, plasmodia were grown in metal trays on a membrane supported by filter paper on stainless-steel screen. Plasmodia were started from a ring of inoculum to allow inward and outward migr...
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Nuclei in G2 phase of the slime mold Physarum polycephalum, when transplanted, by plasmodial coalescence, into an S-phase plasmodium, failed to start another round of DNA synthesis. In the reciprocal combination, S-phase nuclei in a G2-phase host continued DNA synthesis for several hours without appreciable decrease in rate. It is suggested that the beginning of DNA replication is determined by...
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