Cellular Retinoic Acid Binding Protein
This small protein's job in the cell is to transport the hydrophobic small molecule, retinoic acid, a metabolite important to vision. The protein has a simple , which also serves as a pocket for the () retinoic acid.
This structure has a nice example of a .
The sheet is , with one face hydrophobic and one face hydrophilic. Where does the hydrophobic point?
There is also a simple in this protein.
This helix is also . Where does the hydrophobic point?
Different views of the backbone: