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Which of the following are known as helix breakers?

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Which of the following are known as helix breakers?

(a) Proline and glycine

(b) Isoleucine and leucine

(c) Valine

(d) Threonine

This question was addressed to me in an interview for job.

My question is taken from Protein Secondary Structure in portion Three Dimensional Structure Of Proteins and Protein Function of Biochemistry

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The correct option is (a) Proline and glycine

To explain: Proline and glycine are known as helix breakers as they disrupt the regularity of the alpha helical backbone conformation.

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