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Milk Composition & Synthesis
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Milk Synthesis

Milk Proteins and Their Synthesis

The proteins that will be secreted by the cell, including the milk proteins synthesized by the epithelial cell, are synthesized in the rough endoplasmic reticulum (RER; see image below). Kappa-casein also is initially glycosylated in the RER. Proteins are then transported to the Golgi apparatus (see image below) where they are further processed. For example, the caseins are phosphorylated and the micelles are formed in the Golgi. Remember from the sections on lactose that it also is synthesized in the Golgi apapratus.

The RER is the site of synthesis of milk proteins.
The Golgi apparatus is the site of protein processing and micelle formation.

Milk Composition & Synthesis