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#vitelline envelope

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Regeneration -ll

The vitelline envelope contains:

The vitelline envelope is an extracellular coat deposited around growing oocyte by follicle cells and oocyte itself, composed primarily of sulfated and non-sulfated glycoproteins homologous to mammalian zona pellucida proteins ZP1, ZP2, ZP3 equivalents. In sea urchins it includes large molecular weight glycoproteins bearing EBR1 receptor with oligosaccharide chains conferring species-specificity for bindin recognition. Matrix lacks bulk lipids, genomic nucleic acids, or regulatory microRNAs; integrity depends on disulfide crosslinks and carbohydrate-carbohydrate interactions. During slow block

Ref: Alberts, Molecular Biology of the Cell, 6th ed., Chapter 21: Egg coats - vitelline envelope glycoproteins and fertilization.

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Sea urchin -l

The vitelline envelope contains:

Vitelline envelope is thin fibrous extracellular matrix immediately surrounding unfertilized sea urchin egg plasma membrane, visible as distinct layer in electron micrographs. Biochemical purification reveals it comprises complex network of sulfated glycoproteins, including 350 kDa EBR1 receptor complex that mediates species-specific sperm binding via bindin interaction. Glycoproteins provide both structural scaffold maintaining envelope integrity and sperm recognition sites determining selectivity. Later cortical granule secretions enzymatically modify this envelope into hardened fertilizatio

Ref: NCBI Bookshelf, Developmental Biology, Chapter 7: Vitelline envelope composition - glycoprotein receptors for bindin.

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