Lipoproteins from the blood and egg yolk of the hen

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Abstract
As part of a study of the transfer of proteins and lipids from avian blood to egg yolk, some properties of lipoproteins from the blood of laying hens were compared with those of the low-density lipoprotein (YLP) from egg yolk of the same hens. Although it is known from previous work that particles of the very-low-density lipoprotein (VLDL) of blood are the most likely precursors of YLP, their apoprotein patterns are different, according to electrophoresis and chromatography, with only one protein in common. YLP has the more complicated pattern which does not, however, include apoprotein B (ApoB) the main apoprotein of VLDL. It is suggested that during the transfer of VLDL to yolk, ApoB is cleaved to give smaller yolk apoproteins, especially apovitellenins IV and VI. Some evidence for this suggestion from the similarity of protein digests is presented.