There isn't a single enzyme that functions optimally in both acidic and basic pH. Enzymes are highly specific, and their activity is usually tightly controlled by the pH of their environment.

Here's why:

* pH and Enzyme Structure: Enzymes have a specific three-dimensional structure that is essential for their function. This structure is influenced by the pH of the surrounding environment. Extreme pH changes can disrupt these delicate bonds, causing the enzyme to lose its shape (denature) and become inactive.

* Optimum pH: Most enzymes have a specific pH range where they function optimally. This optimum pH is determined by the enzyme's amino acid composition and the chemical environment of the active site.

* Examples:

* Pepsin: This enzyme, found in the stomach, works best in highly acidic conditions (pH 1.5-2.5).

* Trypsin: This enzyme, found in the small intestine, works best in slightly alkaline conditions (pH 7.5-8.5).

Instead of a single enzyme working in both acidic and basic pH, there are enzymes that function in different pH ranges:

* Acid-stable enzymes: These enzymes can withstand acidic environments.

* Base-stable enzymes: These enzymes can withstand basic environments.

It's important to note:

* Some enzymes may have a broader pH range than others, but they still have a specific optimum pH.

* Even within a broad range, enzyme activity will decrease significantly outside of the optimum pH.

Let me know if you have more questions!