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The subcellular distribution of the enzymes alpha-amylase, protease and ribonuclease in wheat aleurone layers after treatment with gibberellic acid was determined by differential centrifugation. Of the alpha-amylase 56% was precipitable from cell homogenates, indicating that it is a particulate enzyme. Similar results were recorded with protease. Particulate alpha-amylase showed distinct structural latency, and membrane-rupturing mechanical or chemical treatments were required to release the enzyme in an active form; the results were completely analogous to results with lysosomal enzymes found in animal tissues. The identification of the hormonally induced enzymes as lysosomal suggests that the hormonal mechanism may be more closely associated with extracellular enzyme synthesis rather than with nucleic acid metabolism.

Lysosomal nature of hormonally induced enzymes in wheat aleurone cells