👉 Pyrenin is a type of enzyme that plays a crucial role in the metabolism of amino acids. It consists of two proteins, pyrrolizidine and pyrrolopyran-1-carboxylic acid (PPCA), which are linked by a disulfide bond. The enzyme catalyzes the conversion of pyruvate into acetyl-CoA, a key step in the citric acid cycle. In summary, Pyrenin is an important enzyme involved in