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  • Commelina  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    A study of the in-vitro regulation of phosphoenolpyruvate carboxylase from the epidermis of Commelina communis by malate and glucose-6-phosphate (1982)
    Springer
    Planta 155 (1982), S. 416-422 
    Details
    ISSN: 1432-2048
    Keywords: Commelina ; Epidermis ; Phosphoenolpyruvate carboxylase ; Stoma
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Phosphoenolpyruvate (PEP) carboxylase activity in epidermal extracts of Commelina communis has been compared in the presence of malate and glucose-6-phosphate. The activity of PEP carboxylase was inhibited by increasing malate concentrations at several substrate (PEP) concentrations and changes in both the apparent K m (PEP) and V max values in the presence of malate suggested the occurence of mixed-type inhibiton. In the presence of glucose-6-phosphate no increase in enzyme activity was observed, although there was a slight decrease in the K m (PEP). However, glucose-6-phosphate appeared to alleviate the inhibition caused by malate. The possible implications of these properties in the control of malate production in guard cells is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00394470
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    A comparison of the kinetic properties of phosphoenolpyruvate carboxylase from guard-cell and mesophyll-cell protoplasts of Commelina communis (1985)
    Springer
    Planta 164 (1985), S. 115-120 
    Details
    ISSN: 1432-2048
    Keywords: Commelina ; Guard cell protoplasts ; Phosphoenolpyruvate carboxylase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Some kinetic properties of partially purified phosphoenolpyruvate carboxylase (PEPCase) from guard-cell and mesophyll-cell protoplasts of Commelina communis are described. The PEPCase activity inherent to each cell type was determined and the apparent K m (phosphoenolpyruvate) and K i (malate) were compared. Malate sensitivity was much higher (K i malate 0.4 mol m−3) in the extract of guard-cell protoplasts than in that of mesophyllcell protoplasts (K i malate 4.2 mol m−3). The stimulation of activity by glucose-6-phosphate in the presence of malate (‘deinhibition’) was also investigated in extracts from both cell types and was found to be similar to previously reported results with epidermal tissue. The effect of contamination of an extract of guard-cell protoplasts with mesophyll-cell protoplasts was measured in the presence and absence of malate. It was found that a small amount to mesophyll-cell contaminant appears to desensitize the malate inhibition of PEPCase from guard-cell protoplasts. It is concluded that experiments which use epidermal tissue to study guardcell PEPCase may give misleading information as a consequence of mesophyll contamination.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00391035
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    Paper (German National Licenses)
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