The termini of these structures can sometimes have frayed motifs or Schellman loops.
The termini of these structures can sometimes have frayed motifs or Schellman loops. The turn flips that occur in the T-to-R transition are located in the E and F examples of these structures. Rop consists of four of them in a bundle. End views of these structures are squarish, unlike the triangular appearance of similar three-ten structures. These structures are typically clustered around negative 60- degree phi and negative 45-degree psi angles on a Ramachandran plot. Hydrogen bonds form in an i- plus-four to i pattern in them. They can exist in longer stretches by forming coiled-coils. In nature, the screw sense of these structures is almost always right-handed, and they average about 3.6 residues per full turn. For 10 points, name these protein secondary structures contrasted with beta strands.
The termini of these structures can sometimes have frayed motifs or Schellman loops.
alpha helix [or coiled-coils; prompt on helix]