GroES is a protein that acts as a co-chaperonin in the process of protein folding. It works alongside another protein called GroEL, forming a complex that helps misfolded proteins achieve their correct three-dimensional structure. This is crucial for proper cellular function, as correctly folded proteins are essential for various biological processes. The GroEL-GroES complex functions like a molecular chaperone, providing a protective environment for proteins during folding. When a protein enters the GroEL chamber, GroES caps it, preventing interference from other cellular components. This ensures that proteins can fold correctly, which is vital for maintaining cellular health and function.