Which enzyme is used both in gluconeogenesis and glycogenolysis?

The enzyme phosphogluco-mutase is involved in both gluconeogenesis and glycogenolysis. In glycogenolysis, phosphoglucomutase catalyzes the conversion of glucose-1-phosphate (produced from glycogen breakdown) to glucose-6-phosphate. In gluconeogenesis, phosphoglucomutase plays a role in converting glucose-6-phosphate into intermediates that are used to synthesize glucose from non-carbohydrate precursors. Thus, phosphoglucomutase is an essential enzyme in both processes, aiding in the interconversion of glucose derivatives.