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A protein contains 342 amino acid residues. Assuming that the whole protein is in alpha- helical structures. How long is the protein?

A protein contains 342 amino acid residues. Assuming that the whole protein is in alpha- helical structures. How long is the protein?

Biochemistry
Biochemistry
9th Edition
ISBN:9781319114671
Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Chapter1: Biochemistry: An Evolving Science
Section: Chapter Questions
Problem 1P
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### Question A protein contains 342 amino acid residues. Assuming that the whole protein is in alpha-helical structures, how long is the protein? --- This question pertains to determining the length of a protein composed of 342 amino acid residues, given that the entire structure is in the form of alpha-helices. The alpha-helix is a common secondary structure in proteins, characterized by a coiled shape stabilized by hydrogen bonds. To answer the question and find the length of the protein: 1. **Alpha-Helix Structure Size**: In an alpha-helix, each amino acid residue typically adds approximately 1.5 Ångströms (Å) to the length of the helix. 2. **Total Length Calculation**: For a protein with 342 amino acid residues, the length can be estimated by multiplying the number of residues by the length each residue contributes in an alpha-helix structure. \[ \text{Length} = 342 \, \text{residues} \times 1.5 \, \text{Å/residue} = 513 \, \text{Å} \] Therefore, the length of the protein is approximately 513 Ångströms.
Transcribed Image Text:### Question A protein contains 342 amino acid residues. Assuming that the whole protein is in alpha-helical structures, how long is the protein? --- This question pertains to determining the length of a protein composed of 342 amino acid residues, given that the entire structure is in the form of alpha-helices. The alpha-helix is a common secondary structure in proteins, characterized by a coiled shape stabilized by hydrogen bonds. To answer the question and find the length of the protein: 1. **Alpha-Helix Structure Size**: In an alpha-helix, each amino acid residue typically adds approximately 1.5 Ångströms (Å) to the length of the helix. 2. **Total Length Calculation**: For a protein with 342 amino acid residues, the length can be estimated by multiplying the number of residues by the length each residue contributes in an alpha-helix structure. \[ \text{Length} = 342 \, \text{residues} \times 1.5 \, \text{Å/residue} = 513 \, \text{Å} \] Therefore, the length of the protein is approximately 513 Ångströms.
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