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  • 1
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    Regulation of MAPK function by direct interaction with the mating-specific Galpha in yeast (2002)
    American Association for the Advancement of Science (AAAS)
    Details
    Publikationsdatum: 2002-05-25
    Beschreibung: The mating response of the budding yeast Saccharomyces cerevisiae is mediated by a prototypical heterotrimeric GTP-binding protein (G protein) and mitogen-activated protein kinase (MAPK) cascade. Although signal transmission by such pathways has been modeled in detail, postreceptor down-regulation is less well understood. The pheromone-responsive G protein alpha subunit (Galpha) of yeast down-regulates the mating signal, but its targets are unknown. We have found that Galpha binds directly to the mating-specific MAPK in yeast cells responding to pheromone. This interaction contributes both to modulation of the mating signal and to the chemotropic response, and it demonstrates direct communication between the top and bottom of a Galpha-MAPK pathway.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Metodiev, Metodi V -- Matheos, Dina -- Rose, Mark D -- Stone, David E -- New York, N.Y. -- Science. 2002 May 24;296(5572):1483-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biological Sciences, Laboratory for Molecular Biology, University of Illinois at Chicago, 900 South Ashland Avenue (M/C 567), Chicago, IL 60607, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/12029138" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Amino Acid Motifs ; Amino Acid Sequence ; Cell Nucleus/metabolism ; Cytoplasm/metabolism ; Down-Regulation ; *GTP-Binding Protein alpha Subunits ; GTP-Binding Protein alpha Subunits, Gq-G11 ; *GTP-Binding Protein beta Subunits ; Guanosine Diphosphate/metabolism ; Heterotrimeric GTP-Binding Proteins/chemistry/genetics/*metabolism ; *MAP Kinase Signaling System ; Mitogen-Activated Protein Kinases/*metabolism ; Molecular Sequence Data ; Mutation ; Pheromones/pharmacology ; Phosphorylation ; Recombinant Fusion Proteins/metabolism ; Saccharomyces cerevisiae/genetics/*metabolism/physiology ; Saccharomyces cerevisiae Proteins/*metabolism
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von American Association for the Advancement of Science (AAAS)
    Standort Signatur Erwartet Verfügbarkeit
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    AKTUELLE ARTIKEL
  • 2
    Digitale Medien
    Digitale Medien
    Effect of jasmonic acid on the stomatal and nonstomatal limitation of leaf photosynthesis in barley leaves (1996)
    Springer
    Journal of plant growth regulation 15 (1996), S. 75-80 
    Details
    ISSN: 1435-8107
    Schlagwort(e): Jasmonic acid ; Photosynthesis ; Ribulose ; 1,5-biphosphate carboxylase
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Abstract The effect of long-term (7 days) and shortterm (up to 2 h) treatment of barley plants with jasmonic acid (JA) on the components contributing to stomatal and nonstomatal limitation of photosynthesis was studied. Net CO2 assimilation rate (A) responses to intercellular CO2 concentration (C i ), i.e., A/C i curves, were used to assess the photosynthetic ability. Long-term treatment of barley plants with JA led to a noticeable decrease in both the initial slope of the A/C i curves and the maximum A at saturating C i . The proportion of stomatal and nonstomatal factors in limitation of photosynthesis depended on the applied JA concentration. Short-term treatment with JA affected neither the stomatal conductivity for CO2 nor the rate of photosynthetic CO2 assimilation. We suggest that JA may affect photosynthesis indirectly, either as a stress-modulating substance, or through the alterations in gene expression.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00192935
    Standort Signatur Erwartet Verfügbarkeit
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    Artikel (Nationallizenzen)
    Volltext
  • 3
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    Plasticity in the proteome of Emiliania huxleyi CCMP 1516 to extremes of light is highly targeted (2013)
    Blackwell Publishing - STM
    In:  New Phytologist, 200 (1). pp. 61-73.
    Details
    Publikationsdatum: 2020-06-22
    Beschreibung: Optimality principles are often applied in theoretical studies of microalgal ecophysiology to predict changes in allocation of resources to different metabolic pathways, and optimal acclimation is likely to involve changes in the proteome, which typically accounts for 〉 50% of cellular nitrogen (N). We tested the hypothesis that acclimation of the microalga Emiliania huxleyi CCMP 1516 to suboptimal vs supraoptimal light involves large changes in the proteome as cells rebalance the capacities to absorb light, fix CO2, perform biosynthesis and resist photooxidative stress. Emiliania huxleyi was grown in nutrient-replete continuous culture at 30 (LL) and 1000 μmol photons m−2 s−1 (HL), and changes in the proteome were assessed by LC-MS/MS shotgun proteomics. Changes were most evident in proteins involved in the light reactions of photosynthesis; the relative abundance of photosystem I (PSI) and PSII proteins was 70% greater in LL, light-harvesting fucoxanthin–chlorophyll proteins (Lhcfs) were up to 500% greater in LL and photoprotective LI818 proteins were 300% greater in HL. The marked changes in the abundances of Lhcfs and LI818s, together with the limited plasticity in the bulk of the E. huxleyi proteome, probably reflect evolutionary pressures to provide energy to maintain metabolic capabilities in stochastic light environments encountered by this species in nature.
    Materialart: Article , PeerReviewed
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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    ARTIKEL (OCEANREP)
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