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  • Oryza  (2)
  • Phosphoribulokinase  (2)
  • Springer  (4)
  • American Chemical Society (ACS)
  • International Union of Crystallography (IUCr)
  • Oxford University Press
Collection
Keywords
Publisher
  • Springer  (4)
  • American Chemical Society (ACS)
  • International Union of Crystallography (IUCr)
  • Oxford University Press
Years
  • 1
    Electronic Resource
    Electronic Resource
    The aggregation states of spinach phosphoribulokinase (1990)
    Springer
    Planta 181 (1990), S. 349-357 
    Details
    ISSN: 1432-2048
    Keywords: Light/dark regulation ; Phosphoribulokinase ; Protein aggregation ; Spinacia (phosphoribulokinase)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Phosphoribulokinase (PRK; EC 2.1.7.19) is active in illuminated chloroplasts and inactive in darkened chloroplasts. This regulatory mechanism is mediated by thioredoxin-dependent reduction of a kinase disulfide in vivo. Extracts of spinach (Spinacia oleracea L.) leaves in the presence of 10 mM dithiothreitol contain a single 80-kDa form of PRK as judged by gel filtration. Gel filtration of thiol-free extracts of light-harvested tissue shows the presence of two inactive forms of PRK, the 80-kDa form and an aggregate (〉 550 kDa) form, but treatment of both forms with dithiothreitol restores kinase activity. Gel filtration following extraction of dark-harvested tissue in the absence of dithiotreitol demonstrates the presence of only the heavier form. Inclusion of 400 mM (NH4)2SO4 in the homogenization buffer during extraction of light-harvested tissue suppresses the formation of the high-M r form of PRK, but does not eliminate the aggregate form observed in extracts of dark-harvested leaves. However, prolonged treatment of extracts from dark-harvested tissue with 400 mM (NH4)2SO4 results in conversion of the high-M r form of phosphoribulokinase to the low-M r form. The data are consistent with the heavier form of phosphoribulokinase being the normal in-vivo aggregation state in the dark, while the lighter form is the normal aggregation state in the light. This research was sponsored jointly by the science and education administration of the U.S. Department of Agriculture under Grant No. 88-37130-3722 from the Competitive Research Grants Office and by the Office of Health and Environmental Research, U.S. Department of Energy under Contract DE-AC05-84OR21400 with Martin Marietta Energy Systems Inc., Oak Ridge, Tenn., USA. The author is Postdoctoral Investigator supported by the U.S. Department of Agriculture through Subcontract No. 88-37130-3722 from the Biology Division of Oak Ridge National Laboratory to the University of Tennessee.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00195887
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  • 2
    Electronic Resource
    Electronic Resource
    A comparative map of wild rice (Zizania palustris L. 2n=2x=30) (1999)
    Springer
    Theoretical and applied genetics 99 (1999), S. 793-799 
    Details
    ISSN: 1432-2242
    Keywords: Key words RFLPs ; Synteny ; Oryza ; Oat ; Map
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  We present the first genetic map of wild rice (Zizania palustris L., 2n=2x=30), a native aquatic grain of northern North America. This map is composed principally of previously mapped RFLP (restriction fragment length polymorphism) genetic markers from rice (Oryza sativa 2n=2x=24). The map is important as a foundation for genetic and crop improvement studies as well as a reference for genome organization comparisons among species of Gramineae. A comparative mapping approach with rice is especially useful because wild rice is grouped in the same subfamily, Oryzoideae, and no other mapping comparison has yet been made within the subfamily. As rice is the reference point for mapping and gene cloning in cereals, establishing a consensus map within the subfamily identifies conserved and unique regions. The genomes of wild rice and rice differ in total DNA content (wild rice has twice that of rice) and the number of chromosome pairs (wild rice=15 versus rice=12). The wild rice linkage map reported herein consists of 121 RFLP markers on 16 linkage groups spanning 1805 cM. Two linkage groups consist of only two markers. Colinear markers were found representing all rice linkage groups except #12. The majority of rice loci mapped to colinearly arranged arrays in wild rice (92 of 118). Features of the map include duplication of portions of three rice linkage groups and three possible translocations. The map gives basic information on the composition of the wild rice genome and provides tools to assist in the domestication of this important food source.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001220051298
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  • 3
    Electronic Resource
    Electronic Resource
    A comparative map of wild rice (Zizania palustris L. 2n=2x=30) (2000)
    Springer
    Theoretical and applied genetics 101 (2000), S. 677-684 
    Details
    ISSN: 1432-2242
    Keywords: Key words RFLPs ; Synteny ; Oryza ; Oat ; Map
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  We present the first genetic map of wild rice (Zizania palustris L., 2n=2x=30), a native aquatic grain of northern North America. The map is composed principally of previously mapped RFLP (restriction fragment length polymorphism) genetic markers from rice (Oryza sativa 2n=2x=24). The map is important as a foundation for genetic and crop improvement studies, as well as a reference for genome organization comparisons among Gramineae species. A comparative mapping approach with rice is especially useful because wild rice is grouped in the same subfamily, Oryzoideae, and no other mapping comparison has yet been made within the subfamily. As rice is the reference point for mapping and gene cloning in cereals, establishing a consensus map within the subfamily identifies conserved and unique regions. The genomes of wild rice and rice differ in total DNA content (wild rice has twice that of rice) and chromosome pairs (wild rice=15 versus rice=12). The wild rice linkage map reported herein consists of 121 RFLP markers on 16 linkage groups spanning 1805 cM. Two linkage groups consist of only two markers. Colinear markers were found representing all rice linkage groups except #12. The majority of rice loci mapped to colinearly arranged arrays in wild rice (92 of 118). Features of the map include duplication of portions of three rice linkage groups and three possible translocations. The map gives basic information on the composition of the wild rice genome and provides tools to assist in the domestication of this important food source.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001220051530
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  • 4
    Electronic Resource
    Electronic Resource
    Affinity labeling of spinach phosphoribulokinase subsequent toS-methylation at Cys16 (1990)
    Springer
    The protein journal 9 (1990), S. 445-451 
    Details
    ISSN: 1573-4943
    Keywords: Phosphoribulokinase ; affinity labeling ; bromoacetylethanolamine phosphate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The chloroplast enzyme phosphoribulokinase is reversibly deactivated by oxidation of Cys16 and Cys55 to a disulfide. Although not required for catalysis, Cys16 is an active-site residue positioned at the nucleotide-binding domain (Porter and Hartman, 1988). The hyperreactivity of Cys16 has heretofore limited further active-site characterization by chemical modification. To overcome this limitation, the partially active enzyme,S-methylated at Cys16, has been probed with a potential affinity reagent. Treatment of methylated enzyme with bromoacetylethanolamine phosphate results in essentially complete loss of catalytic activity. Inactivation follows pseudo-first-order kinetics and exhibits a rate saturation with an apparentK d of 3–4 mM. ATP, but not ribulose 5-phosphate, affords substantial protection. Complete inactivation correlates with incorporation of 1 mol of [14C]reagent per mole of enzyme subunit. Amino acid analysis of the [14C]-labeled enzyme demonstrates that only cysteine is modified, and mapping of tryptic digests shows that Cys55 is a major site of alkylation. These results indicate that Cys55 is also located in the ATP-binding domain of the active-site.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01024620
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