METABOLIC SEGREGATION OF INTRACELLULAR FREE AMINO ACIDS IN PLATYMONAS (CHLOROPHYTA)1 |
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Authors: | Patricia A. Wheeler Grover C. Stephens |
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Abstract: | 14C-amino acids were supplied to Platymonas subcordiformis (Wille) Hazen and the incorporation of radioactivity into protein and other compounds was followed. Alanine was rapidly metabolized by both N-limited and N-sufficient cells. Arginine and lysine were metabolized rapidly by N-limited cells, but were sequestered from metabolism in N-sufficient cells. This suggests the existence of two functionally distinct pools; a “metabolic” pool that is rapidly metabolized and preferentially used for incorporation into protein, and a “storage” pool rich in basic amino acids that is sequestered from metabolism. |
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Keywords: | amino acids, basic amino acid pools, free Platymonas storage pools, nitrogen |
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