Single-pass membrane protein
Transmembrane protein / From Wikipedia, the free encyclopedia
A single-pass membrane protein also known as single-spanning protein or bitopic protein is a transmembrane protein that spans the lipid bilayer only once.[1][2] These proteins may constitute up to 50% of all transmembrane proteins, depending on the organism, and contribute significantly to the network of interactions between different proteins in cells, including interactions via transmembrane alpha helices.[3] They usually include one or several water-soluble domains situated at the different sides of biological membranes, for example in single-pass transmembrane receptors.[4] Some of them are small and serve as regulatory or structure-stabilizing subunits in large multi-protein transmembrane complexes, such as photosystems or the respiratory chain. More than 2300 single-pass membrane proteins were identified in the human genome.[5]