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  • 1
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    BioEssays 4 (1986), S. 52-56 
    ISSN: 0265-9247
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The studies on the cAMP-requiring mutants and their suppressors in the yeast, Saccharomyces cerevisiae, revealed that cAMP-dependent protein phosphorylation is involved in the G1 phase of the cell cycle, in conjugation, and in the post-meiotic stage of sporulation, and that inhibition of cAMP-dependent protein phosphorylation is required to induce meiotic division.
    Additional Material: 2 Ill.
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  • 2
    ISSN: 1432-072X
    Keywords: Monokaryotic fruiting ; Meiosis ; DNA replication ; Fluorescent microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract By applying the method of fluorescent microscopy to propidium iodide stained cells, change in the relative amount of DNA in a basidium was examined during the meiotic process in Coprinus macrorhizus. In the monokaryotic basidiocarp of the mutant strain Fisc, mitotic DNA replication was first induced soon after a 3h-illumination period on the 10th day of culture, and subsequently meiotic DNA replication occurred after karyogamy.
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  • 3
    ISSN: 1432-072X
    Keywords: Neurospora crassa ; Morphological mutant ; Cyclic adenosine 3′,5′-monophosphate ; Protein kinase ; Cyclic AMP-binding protein
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A cpk mutant of Neurospora crassa with morphological alteration was obtained spontaneously during the cross between the wild-type and a glycerol utilizing cr-l strain. The growth rate of cpk was intermediate between the wild-type and cr-1 mutant strains. The cpk conidia contained a reduced level of carotenoid pigments as compared to the wild-type conidia. The cpk mutant had no detectable amount of cyclic adenosine 3′,5′-monophosphate (cAMP)-binding protein at all stages of growth tested. On a DEAE-Sephacel column chromatogram, protein kinase activity of the wild type was eluted at two peaks; the first peak was cAMP-dependent, and the second one was not. In contrast, the cpk strain had two peaks of cAMP-independent enzymes. It is suggested that cAMP-dependent protein kinase may be altered in the cpk mutant into a cAMP-independent type by an alteration of the regulatory subunit of this enzyme.
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  • 4
    ISSN: 1432-0983
    Keywords: Saccharomyces cerevisiae ; Cell cycle ; Cyclic AMP ; G0 protein
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary When the cyr1-1 cells of Saccharomyces cerevisiae, which require cyclic AMP (cAMP) for growth, were starved for cAMP, cell division was arrested at the G1 state of the mitotic cell cycle and the cells entered the resting state (G0) also observed in wild-type cells transferred to sulfur-free medium. The level of cAMP in wild-type cells decreased rapidly when the cells were starved for sulfur and subsequently increased following its addition. The cyr1-1 cells starved for cAMP preferentially synthesized nine G0 proteins. The synthesis of these G0 proteins in the sulfur-starved cells was repressed by the addition of cAMP. The RAS2 val19 or bcy1 cells, which produced an elevated level of cAMP or cAMP-independent protein kinase, did not synthesize the G0 proteins under the sulfur-starved condition. The results suggest that cAMP plays a role in the transition between the proliferating state and G0 state.
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  • 5
    ISSN: 1432-072X
    Keywords: Neurospora crassa ; Temperature-Sensitive Mutant ; Unbalanced Growth ; Phospholipid Synthesis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A temperature-sensitive mutant of Neurospora crassa was found to undergo rapid death on minimal medium at 35°C. The loss of viability in this mutant was prevented by various factors which retard growth, including deprivation of carbon sources or interruption of protein synthesis. Synthesis of nucleic acids and protein in this mutant was normal at the early stages of germination and then depressed at 35°C. The active transport of glucose and the respiration rate in this mutant were depressed at 35°C. Phospholipid synthesis was significantly repressed at 35°C. The possible significance of the characteristics of this mutant is discussed in terms of membrane biosynthesis.
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  • 6
    ISSN: 1432-072X
    Keywords: Basidiomycete ; Coprinus macrorhizus ; Sporeless mutants ; Glutamate dehydrogenase ; Chitinase ; Laminarinase ; Liohenase ; Sequential enzyme production
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The production of NADP-dependent glutamate dehydrogenase was initiated at the stage of first meiotic prophase in pileus cells but not in stipe cells of dikaryotic and monokaryotic fruiting bodies in Coprinus macrorhizus. The production of chitinase and glucanases assayed with laminarin and lichenan was observed after the completion of meiosis only in pileus cells. The light conditions that were effective for the delay or inhibition of cellular events in the pileus cells were also effective for the delay or inhibition of enzyme production. But all sporeless mutants tested, which were defective at the various stages of basidiospore formation, produced the normal levels of these enzymes. The results indicate that the sequential production of enzymes and cellular events leading to basidiospore formation in pileus cells are independent from each other.
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  • 7
    ISSN: 1432-072X
    Keywords: Basidiomycete ; Comprinus macrorhizus ; Monokaryotic fruiting ; Meiosis ; Synaptonemal complex
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The process of basidiospore formation in a mutant strain Fisc of Coprinus macrorhizus, a heterothallic species of Basidiomycete, which forms monokaryotic fruiting bodies was examined. A single nucleus in a young basidium divided mitotically and two daughter nuclei were fused subsequently. The fused nucleus then divided meiotically forming four basidiospores on a basidium. The typical chromosome behaviours in the first meiotic prophase were observed. Synaptonemal complexes were observed in a basidium at the first meiotic prophase. A continuous illumination of fruiting bodies was effective to arrest meiosis in monokaryotic fruiting bodies at the particular stage of meiotic division.
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  • 8
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] BALB/c mice were immunized with PIP2 prepared from bovine spinal cords13, and a clone of hybridoma cells producing an antibody of immunoglobulin G2b class was isolated. The immunoglobulin G preparation, designated antibody kt3g, had virtually no affinity for phosphatidylcholine, ...
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  • 9
    ISSN: 0749-503X
    Keywords: Cyclic AMP ; phosphoprotein phosphatase ; protein kinase ; suppressor ; Life and Medical Sciences ; Genetics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Notes: The ppd1 mutant of yeast, Saccharomyces cerevisiae, was isolated as a suppressor of the cyr2 mutation which caused alteration of the catalytic subunit of cAMP-dependent protein kinase. Three peaks of phosphoprotein phosphatase activity (peak I, II and III) were identified by DEAE-Sephacel chromatography of crude extracts of the wild-type strain. The ppd1 mutant was deficient in peak III phosphoprotein phosphatase activity. The peak III enzyme efficiently utilized the phosphorylated forms of NAD-dependent glutamate dehydrogenase and trehalase as substrate. The ppd1 mutation did not suppress the cyr1, CYR3 or ras1 ras2 mutations. The ppd1 locus was located on chromosome II and had identical characteristcs with glc1. The ppd1 mutation suppressed the G1 arrest caused by nutritional limitation, but maintained sensitivity to mating pheromone. In diploids homozygous for the ppd1 mutation, no premeiotic DNA replication and commitment to intragenic recombination occurred and no spores were formed, suggesting that the accumulation of phosphorylated proteins in the absence of one of the phosphoprotein phosphatases is required for mitosis but not for the initiation of meiosis.
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  • 10
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Yeast 1 (1985), S. 15-24 
    ISSN: 0749-503X
    Keywords: Life and Medical Sciences ; Genetics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Additional Material: 1 Ill.
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