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Digitale Medien

Expression of the Saccharomyces cerevisiae CYT2 gene, encoding cytochrome c1 heme lyase (1994)

Zollner, Alfred ; Rödel, Gerhard ; Haid, Albert

Springer

Current genetics 25 (1994), S. 291-298

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ISSN: 1432-0983

Schlagwort(e): Cytochrome c 1 ; Cytochrome c 1 heme lyase ; GRF2p ; Glucose repression ; HAPp ; Saccharomyces cerevisiae

Quelle: Springer Online Journal Archives 1860-2000

Thema: Biologie

Notizen: Abstract In this paper we examine the expression of the Saccharomyces cerevisiae CYT2 gene, which encodes cytochrome c 1 heme lyase. This enzyme is required for covalent attachment of heme to apocytochrome c 1, a subunit of the mitochondrial respiratory chain. Transcription of the 1-kb CYT2 mRNA initiates at four prominent sites at a distance of 52–225 bp in front of the AUG start codon. The level of CYT2 mRNA is not influenced by the presence or absence of oxygen or of heme, but it is subject to carbonsource control. The concentration of the CYT2 mRNA is significantly reduced in glucose-grown cells as compared to cells grown under non-repressing conditions. Neither the HAPp activator proteins nor MIG1p, a repressor protein involved in glucose repression, seem to mediate this effect.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00351480

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Digitale Medien

Rapid reactions of spruce cells to elicitors released from the ectomycorrhizal fungus Hebeloma crustuliniforme, and inactivation of these elicitors by extracellular spruce cell enzymes (1996)

Salzer, Peter ; Hebe, Gerhard ; Reith, Andreas ; [weitere]

Springer

Planta 198 (1996), S. 118-126

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ISSN: 1432-2048

Schlagwort(e): Ectomycorrhiza ; Elicitor inactivation ; Elicitor-induced reaction ; Hebeloma — Picea cells ; Signal transduction

Quelle: Springer Online Journal Archives 1860-2000

Thema: Biologie

Notizen: Abstract Elicitors released from hyphae or cell walls of the ectomycorrhizal fungus Hebeloma crustuliniforme (Bull. ex Fries.) Quél. induced in suspension-cultured cells of Picea abies (L.) Karst. a set of fast reactions: (i) an immediate efflux of Cl− into the medium, followed by a K+ efflux; (ii) an influx of Ca2+ (measured as accumulation of 45Ca2+ in the cells); (iii) a phosphorylation of a 63-kDa protein and dephosphorylation of a 65-kDa protein (detectable by 4 min after elicitor application); (iv) an alkalinization of the medium, and (v) a transient synthesis of H2O2. The removal of extracellular Ca2+ by EGTA delayed the elicitor-induced alkalinization. A further reduction of this response could be achieved by TMB-8 an inhibitor of Ca2+ release from intracellular stores. Moreover, the inhibition of protein kinase activity by staurosporine prevented the extracellular alkalinization completely. However, the effectiveness of the elicitors in inducing the extracellular alkalinization was strongly impaired by constitutively secreted enzymes of spruce cells which cleaved the elicitors to inactive fragments. It is suggested that in ectomycorrhizae the efficacy of elicitors released from fungal cell walls is controlled by apoplastic enzymes of the host; the plant itself is able to reduce the activity of fungal elicitors on their way through the plant cell wall. But those elicitors which finally reach the plasma membrane of host cells induce reactions that are similar to the early defense reactions in plant-pathogen interactions.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00197594

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Digitale Medien

Precision measurement of the conversion electron spectrum of83m Kr with a solenoid retarding spectrometer (1992)

Picard, A. ; Backe, H. ; Bonn, J. ; [weitere]

Springer

The European physical journal 342 (1992), S. 71-78

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ISSN: 1434-601X

Schlagwort(e): 27.50.+e ; 29.30.Dn

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract This paper reports on precision measurements of conversion lines in the decay of83mKr with nuclear transition energies of 32.1 keV and 9.4 keV, respectively. The spectra were taken from a submonolayer surface of83m Kr frozen onto a cold backing, using the new Mainz solenoid retarding spectrometer. The high luminosity and resolution of this instrument enables the observation of all allowed conversion lines up to theN-shell and to fully separate the elastic component from inelastic satellites. The combined analysis of the data yields the transition energiesE y=32151.5±1.1 eV and 9405.9±0.8 eV, respectively. The experiment served also to pilot the application of this spectrometer to the question of a finite neutrino rest mass, searched for in theβ-decay spectrum of tritium and to problems in precision electron spectroscopy in general.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01294491

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