MoBio Secondary Structure Chapter 2

In a protein, certain domains may form specific structures such as α helix and β strand, which constitute the secondary structure of the protein.

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Figure 2-C-1. The secondary structure of RNase A, which contains three α helices and seven β strands.

(a)

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(b)

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Figure 2-C-2. The α helix and β strand in RNase A. (a) Residues 1 to 36. (b) Residues 80 to 85. PDB ID = 1RCN.