transmembrane protein

This term is a technical biological designation used primarily in biochemistry and cell biology. It describes a specific structural orientation where a protein is embedded within the lipid bilayer of a cell membrane, rather than being peripherally attached to the surface. The term implies a physical bridge that allows the protein to interact with both the internal and external environments of the cell simultaneously.

In a professional scientific register, this term is often used interchangeably with integral membrane protein, though transmembrane specifically emphasizes the spanning of the entire membrane. It is typically used in the context of discussing ion channels, receptors, or transport proteins that facilitate the movement of molecules across biological barriers.