Ans.
The GAPDH (glyceraldehyde-3-phosphate dehydrogenase) is a catalytic protein that converts glyceraldehyde-3-phosphate into 1,3-BPG (1,3-bisphosphoglycerate) during glycolysis. The 1,3-BPG contains a high-energy phosphate group, which is transferred to the ADP to form ATP, the energy currency of the cell, in the next step of glycolysis.
Thus, in E.coli., 'GAPDH helps in the 1,3-BPG that helps in ATP formation and provides energy to the cell.'