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  • 1
    Electronic Resource
    Electronic Resource
    β-Carotene synthesis in isolated chromoplasts from Narcissus pseudonarcissus (1980)
    Springer
    Planta 150 (1980), S. 435-438 
    Details
    ISSN: 1432-2048
    Keywords: Carotene synthesis ; Chromoplasts ; Narcissus ; Polyprenoids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A system has been established from isolated intact chromoplasts of Narcissus pseudonarcissus flowers that synthesizes geranylgeraniol, an unknown polyprenoid alcohol, phytoene, and β-carotene from [1-14C]isopentenyl pyrophosphate in a good yeild. Long chain pyrophosphates are not accumulated. San 6706 inhibits the dehydrogenation of phytoene, whereas nicotine does not lead to an accumulation of lycopene. Separation and identification of polyprenoid lipids was performed by HPLC. The properties and advantages of the chromoplast system are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00390182
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  • 2
    Electronic Resource
    Electronic Resource
    On the compartmentation of isopentenyl diphosphate synthesis and utilization in plant cells (1981)
    Springer
    Planta 153 (1981), S. 578 
    Details
    ISSN: 1432-2048
    Keywords: Chloroplasts ; Chromoplasts ; Isopentenyl diphosphate ; Narcissus ; Polyprenoids ; Spinacia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Purified spinach chloroplast and daffodil chromoplast preparations do not use mevalonate, phosphomevalonate, and diphosphomevalonate for the synthesis of isopentenyl diphosphate. Isopentenyl diphosphate, on the other hand, is incorporated into plastidal polyprenoids in large amounts. In the presence of a cytoplasmic supernatant, however, mevalonate and the phosphomevalonates were incorporated into the plastidal polyprenoids in equally large amounts, which demonstrates that the enzymes mevalonate kinase (EC 2.7.1.36), phosphomevalonate kinase (EC 2.7.4.2), and diphosphomevalonate decarboxylase (EC 4.1.1.33) are soluble cytoplasmic enzymes and that they apparently do not occur as isoenzymes within the plastids. The concept is developed that isopentenyl diphosphate is a central intermediate in plant polyprenoid formation which is channeled into several compartment for different biosynthetic pathways.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00385544
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  • 3
    Electronic Resource
    Electronic Resource
    Phosphate translocator and adenylate translocator in chromoplast membranes (1980)
    Springer
    Planta 150 (1980), S. 170-173 
    Details
    ISSN: 1432-2048
    Keywords: Adenylate translocator ; Chromoplasts ; Fatty acid synthesis ; Narcissus ; Phosphate translocator
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract It is shown by the criteria of saturation kinetics, specificity, and inhibition experiments that chromoplast membranes from the daffodil flower contain a phosphate translocator for the counter-exchange of phosphate, and 3-phosphoglycerate, as well as phosphoenolpyruvate; they also contain an adenylate translocator. This is the first report on the occurrence of these translocators in non-green plastids. Both translocators exhibit certain dissimilar properties when compared to the corresponding systems of chloroplasts. The transport rates of both translocators are sufficient to allow a prominent fatty acid synthesis in isolated chromoplasts when C3 intermediates of the glycolytic pathway or adenine nucleotides are used as energy sources.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00582362
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  • 4
    Electronic Resource
    Electronic Resource
    The site of carotenogenic enzymes in chromoplasts from Narcissus pseudonarcissus L. (1982)
    Springer
    Planta 154 (1982), S. 66-69 
    Details
    ISSN: 1432-2048
    Keywords: Carotene synthesis ; Carotenogenic enzymes ; Chromoplasts ; Membranes ; Narcissus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The membranes from the chromoplasts of Narcissus pseudonarcissus L. which are derived from the inner envelope membrane are the site of β-carotene synthesis from [1-14C]isopentenyl diphosphate. The enzymes involved are partly peripheral membrane proteins (prenyltransferase, phytoene synthase) and partly integral membrane proteins (cis-trans isomerase, dehydrogenase(s), cyclase(s)). Metabolic channeling is suggested.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00385498
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  • 5
    Electronic Resource
    Electronic Resource
    Fatty acid synthesis by isolated chromoplasts from the daffodil. Energy sources and distribution patterns of the acids (1980)
    Springer
    Planta 150 (1980), S. 166-169 
    Details
    ISSN: 1432-2048
    Keywords: Chromoplasts ; Energy sources (in fatty acid synthesis) ; Fatty acid synthesis ; Glycolytic intermediates ; Narcissus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract 1. Fatty acid synthesis in isolated intact chromoplasts from [1-14C]acetate was made possible by using ATP, ADP (via adenylate kinase), and, with decreasing efficiency, UTP, CTP, and GTP as energy sources. 2. The glycolytic path from dihydroxyacetone phosphate to acetyl-CoA operates within the chromoplasts. The glycolytic intermediates, especially 2-phosphoglycerate and phosphoenolpyruvate, served as very effective energy donors for fatty acid synthesis by phosphorylating the endogenous adenine nucleotide pool. 3. In the presence of exogenous ATP or ADP, appreciable amounts of in vitro formed fatty acids were found as acyl-CoA and subsequent products, mainly phosphatidylcholine. When other energy sources were used most of the acids formed were in the free form, and to a minor extent, in the phosphatidic acid and diacylglycerol fractions. Similar results have recently been reported for spinach chloroplasts (Kleinig and Liedvogel 1979, FEBS Lett.101, 339–342).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00582361
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