Protein Synthesis and Proteins as Energy Source

Protein anabolism and catabolism are governed by many forces. Some rules apply  

Which specific proteins are synthesized in a cell is governed entirely by the needs or functions of the cell at that time. 

Synthesis of specific proteins is triggered by a specific signal. 

Synthesis of a specific protein may not occur if the general anabolic state of the cell is low. 

The anabolic state is reflected by metabolite availability and the presence of anabolic or catabolic hormones. 

---