Characterization of ribosomes from the phycomycetes, Rhizopus arrhizus and Pythium debaryanum

Fungal ribosomal vaccines. II. Dermatophyte vaccine--initial studies on the antigenicity of a crude ribosomal fraction from Microsporum canis

A crude ribosomal fraction was extracted from Microsporum canis. The ratio of spectrophotometric readings at 260 and 280 nm was 1.56 and the nucleic acid to protein ratio of the fraction was 1.5. A delayed intradermal hypersensitivity test in guinea pigs was positive and dose related.

Studies on the macroconidia of Microsporum canis. Characteristics of in vitro amino acid incorporating system

The characteristics of an in vitro polyuridylic acid dependent amino acid incorporating system prepared from germinating macroconidia of Microsporum canis are described. The incorporation of 14C-phenylalanine into polyphenylalanine is dependent on S-30 extract, adenosine triphosphate, magnesium ions and polyuridylic acid. Incorporation is slightly enhanced by yeast transfer ribonucleic acid and pyruvate kinase. The system is highly sensitive to ribonuclease, puromycin and miconazole (an antifungal agent), moderately sensitive to sodium fluoride and much less sensitive to phenethylalcohol, cycloheximide, chloramphenicol and deoxyribonuclease. Cell-free extract from ungerminated conidia has less capacity to synthesize the protein and during germination a marked increase in the protein synthetic activity is observed. The results from experiments wherein ribosomes and S-100 fraction from germinated and ungerminated spores are unterchanged, revealed that the defect in the extract from the ungerminated spore is in the ribosomes.