Amphiphatic helices are
Many α helices have predominantly hydrophobic R-groups projecting from one side of the axis of the helix and predominantly hydrophilic R-groups projecting from the other side. These amphipathic helices are well adapted to the formation of interfaces between polar and nonpolar regions such as the hydrophobic interior of a protein and its aqueous environment. Clusters of amphipathic helices can create channels, or pores, through hydrophobic cell membranes that permit specific polar molecules to pass.
Note: Clusters of twisted strands of β sheet are called β barrels.
Ref: Harper’s illustrated biochemistry. 30th edition page no: 37
α helices having predominantly hydrophobic R-groups projecting from one side and predominantly hydrophilic R-groups projecting from the other side of the axis of the helix
Clusters of twisted strands of β sheet
Short segments of amino acids that join two units of the secondary structure
Supersecondary structures