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  • 1
    ISSN: 1432-072X
    Keywords: Chitin synthetase ; Phycomyces blakesleeanus ; Calcium-calmodulin ; Proteases
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Levels of basal chitin synthetase in cell-free extracts from Phycomyces blakesleeanus were reduced by breakage of cells in the presence of EDTA or EGTA. Addition of Ca2+ to these extracts activated chitin synthetase. Maximal activation was obtained after 2 h at a Ca2+ concentration of 2–5 mM. Activation by calcium was not reduced by any protease inhibitor tested but benzamidine, whereas the weak proteolytic activity of the extracts was inhibited by antipain. Larger levels of chitin synthetase activation were obtained by the simultaneous addition of calcium and calmodulin in most, but not all extracts. This further activation by calmodulin was prevented by TFP. ATP or cAMP did not stimulate activation by calcium or calcium-calmodulin.
    Type of Medium: Electronic Resource
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