Effects of univalent cations on the activity of particulate starch synthetase.

  title={Effects of univalent cations on the activity of particulate starch synthetase.},
  author={R E Nitsos and H. J. Evans},
  journal={Plant physiology},
  volume={44 9},
An investigation was made to determine the univalent cation requirements of starch synthetase from a variety of plant species of economic importance. The particulate enzyme from sweet corn was shown to have an absolute requirement for potassium, with the optimum activation occurring at 0.05 M KCl. Rubidium, cesium, and ammonium were 80% as effective as potassium while sodium and lithium were respectively 21% and 8% as effective as potassium. The K(A) for potassium was determined to be 6 mM. In… CONTINUE READING


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