Function
Vitellinogen precursors provide the major egg yolk proteins that are a source of nutrients during early development of egg-laying (oviparous) vertebrates and invertebrates. Vitellogenin is the precursor of the lipoproteins and phosphoproteins that make up most of the protein content of yolk. More specifically, the N-terminal domain functions as a signal peptide which helps export. Vitellinogen precursors are multi-domain apolipoproteins ( proteins that bind to lipids to form lipoproteins), that are cleaved into distinct yolk proteins. Different vitellinogen precursors exist, which are composed of variable combinations of yolk protein components; however, the cleavage sites are conserved.
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