Transmembrane Protein

	Hydrophilic Region
	Hydrophobic Region
	Hydrophilic Region

Transmembrane Protein.  The structure of a transmembrane protein. This ribbon model highlights the a-helical secondary structure of the hydrophobic parts of the protein, which lie mostly within the hydrophobic core of the membrane. This particular protein, bacteriorhodopsin, has seven transmembrane helices (outlined with cylinders for emphasis). The nonhelical hydrophilic segments of the protein are in contact with the aqueous solutions on either side of the membrane. Bacteriorhodopsin is a specialized transport protein found in certain bacteria. (from Campbell 6, p.143)