Dev Growth Differ 2002 Aug 01;444:345-56. doi: 10.1046/j.1440-169x.2002.00645.x.

Localization and functional role of a 41 kDa collagenase/gelatinase activity expressed in the sea urchin embryo.

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The egg storage compartment of the sea urchin embryo was investigated for a protein destined for export to the extracellular matrices. Using an antiserum prepared against a 41 kDa collagenase/gelatinase localized to the extraembryonic matrices (the hyaline layer and basal lamina), the egg storage compartment was mapped for this antigen. Indirect immunofluorescence analysis revealed the 41 kDa collagenase/gelatinase in the cortical granules as well as a second compartment which was dispersed throughout the egg cytoplasm. High resolution immunogold labeling defined this cytoplasmic compartment as the yolk granule organelle. Gelatin substrate gel zymography revealed the presence of a 41 kDa gelatin cleavage activity in purified yolk granules. These results suggest a role for yolk granules in regulated protein export and challenge the traditional view of this organelle as a benign storage compartment for nutrients. In additional experiments, embryos grown in the presence of the 41 kDa cleavage activity or the anti-41 kDa antiserum had severely delayed gut formation and spicule elongation. These results demonstrate a requirement for defined levels of the 41 kDa activity in the extracellular matrices of the developing embryo.

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Genes referenced: LOC100887844