Chapter 25: Problem 14

What is the \(\alpha\) -helical structure in proteins?

Short Answer

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An \(\alpha\)-helix is a type of secondary structure found in proteins, which is formed when a polypeptide chain coiled like a spring is held together by hydrogen bonds between the carbonyl oxygen of one amino acid and the hydrogen of the amino group of an amino acid four residues earlier in the chain.

Step by step solution

Definition of an \(\alpha\)-helix

An \(\alpha\)-helix is a type of secondary structure found in proteins. Proteins are composed of polypeptides or chains of amino acids. As these chains fold into specific shapes, they form different types of structures, including the \(\alpha\)-helix.

Structure of an \(\alpha\)-helix

In an \(\alpha\)-helix, the protein chain is coiled, much like a spring, and held in place by hydrogen bonds. These hydrogen bonds are formed between the carbonyl oxygen of one amino acid and the hydrogen of the amino group of an amino acid four residues earlier in the chain. The resulting structure is a right-handed coiled strand.

Significance of an \(\alpha\)-helix

This structure is common in proteins and allows for stable arrangements, thanks to the hydrogen bonds that minimize contact with hydrophobic parts of the protein. In addition, the \(\alpha\)-helical structure allows proteins to form more complex tertiary structures as the polypeptide chain continues to fold onto itself. Thus, the \(\alpha\)-helix is crucial for the overall form and function of proteins.

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What is the \(\alpha\) -helical structure in proteins?

Short Answer

Step by step solution

Definition of an \(\alpha\)-helix

Structure of an \(\alpha\)-helix

Significance of an \(\alpha\)-helix

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