How long is a parallel beta strand containing 64 amino acids in angstroms? Alpha

Question

How long is a parallel beta strand containing 64 amino acids in angstroms?
Alpha-keratin is composed of alpha-helices containing 314 amino acids. How ling are these alpha-helices in angstroms?

How long is a parallel beta strand containing 64 amino acids in angstroms?
Alpha-keratin is composed of alpha-helices containing 314 amino acids. How ling are these alpha-helices in angstroms?

How long is a parallel beta strand containing 64 amino acids in angstroms?
Alpha-keratin is composed of alpha-helices containing 314 amino acids. How ling are these alpha-helices in angstroms?

Explanation / Answer

A beta strand (also strand) is a stretch of polypeptide chain typically 3 to 10 amino acids long with backbone in an extended conformation. The axial distance between adjacent residues is 3.5 Angstroms. There are two residues per repeat unit which gives the beta-strand a 7 Angstrom pitch.

there with 64 amino acids there will be 32repeat units=32x7=224A0.

b.In the alpha-helix the axial distance between adjacent residues is only 1.5 Angstroms.

therefore between 314 amino acids =314x1.5=471A0

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