Abstract
Fructose-1,6-diphosphatase (FDPase) activity increases in the castor bean during germination. The increase is due to de novo synthesis of a second FDPase and is induced by gibberellic acid. Isolation and partial purification of these FDPases provide a comparison of their respective properties. FDPase I has a neutral pH optimum, is AMP-sensitive, and is present in the ungerminated bean. FDPase II also has a neutral pH optimum, is AMP-insensitive, and is synthesized in the endosperm during germination as described above. FDPase III has been isolated from the mature leaf, has an alkaline pH optimum and is present only in the photosynthetic tissue.
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