Question
The $\alpha$ -helical parts of myoglobin and other proteins stop whenever a proline residue is encountered in the chain. Why is proline never present in a protein $\alpha$ -helix?
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The $\alpha$ -helical parts of myoglobin and other proteins stop whenever a proline residue is encountered in the chain. Why do you think a proline is never present in a protein $\alpha$ helix?
Proline is often called an $\alpha$ -helix terminator; that is, it is usually in the random-coil secondary structure following an $\alpha$ -helical portion of a protein chain. Why does proline not fit easily into an $\alpha$ -helix structure?
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