Alpha Helix - Beta Sheet Construction Kit© Teacher Resources

The linear amino acid sequence defines the primary structure of a protein. Regions of the linear polypeptide chain fold into the stable α-helix and β-sheet structures to form the protein secondary structure. The tertiary protein structure is the overall 3-D shape of the protein. With this model collection, students can assemble an α-helix or anti-parallel β-sheet, compare the phi-psi angles of the 2 secondary structures, and explore the contribution of hydrogen bonding to the stability of the structure.

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