Abstract
1. A trypsin-like proteinase has been found in Artemia dormant embryos localized in yolk granules associated to lipovitellin. 2. During development, and in parallel with an exponential increase in the activity of the proteinase, we have observed (a) gradual changes in its subcellular localization from the yolk granules to the cytosol, (b) a gradual decrease in the molecular weight of the cytosolic enzyme, and (c) a gradual improvement in the accessibility of substrates and inhibitors to the proteinase active centre. 3. The partially purified cytosolic proteinase reacted with anti-lipovitellin antiserum. The results are discussed in relation to the yolk origin of the proteinase and its activation during development.
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