tryptophan self controls its synthesis justify this statement

Tryptophan self-controls its synthesis by a process called feedback inhibition. This is when the end product of a biochemical pathway inhibits an enzyme further up the chain. In this case, the end product, tryptophan, inhibits the first enzyme of the pathway, which effectively shuts down the synthesis process and prevents tryptophan from accumulating in the cell. This is a crucial mechanism for maintaining homeostasis, or stable concentrations of essential molecules inside the cell.

Tryptophan self-controls its synthesis because the amount of its synthesis depends on the concentration of tryptophan itself. When tryptophan levels are high in a cell, enzyme activity slows down, resulting in decreased rates of tryptophan synthesis. Conversely, when tryptophan levels are low, the enzyme activity speeds up, resulting in increased rates of tryptophan synthesis. Thus, the level of tryptophan itself can act as a regulator of its own synthesis, providing self-control.