1,3-bisphosphoglycerate (1,3-BPG) is a key intermediate in the glycolysis metabolic pathway, which is essential for energy production in cells. It is formed from glyceraldehyde-3-phosphate and plays a crucial role in converting glucose into usable energy in the form of ATP. 1,3-BPG contains two phosphate groups and is a high-energy compound. It can be converted into 3-phosphoglycerate by the enzyme phosphoglycerate kinase, releasing energy that is used to generate ATP. This process is vital for cellular respiration and energy metabolism in living organisms.