Sec31 is a protein that plays a crucial role in the process of vesicle transport within cells. It is part of the COPII complex, which is responsible for transporting proteins from the endoplasmic reticulum to the Golgi apparatus. This transport is essential for proper cellular function and communication. In addition to its role in transport, Sec31 is involved in the formation of vesicles, which are small membrane-bound sacs that carry molecules. The proper functioning of Sec31 and the COPII complex is vital for maintaining cellular health and ensuring that proteins reach their intended destinations within the cell.