What are the channels and pumps made of carbohydrates?

Channels and pumps that facilitate transport across cell membranes are primarily made of proteins, not carbohydrates. However, carbohydrates can be involved in the structure of glycoproteins and glycolipids, which may play roles in cell signaling and recognition. Some transport mechanisms may utilize carbohydrate-binding proteins, but the channels and pumps themselves, like ion channels and ATP-powered pumps, are predominantly protein-based structures.