Keeping in mind what we discussed for the rotation about the C-C bond in ethane, identify...

Keeping in mind what we discussed for the rotation about the C-C bond in ethane, identify which of these bonds in the backbone of a protein possibly experience rotation. (peptide bond, φ, or ψ).

Any bonds that have free rotation discuss if all possible angles would occur in proteins (why or why not?).

Any bonds that do not experience rotation explain why?

Solutions

Expert Solution

Ans:

Rotation around the peptide bond is not permitted
Rotation around bonds connected to the alpha carbon is permitted
(phi): angle around the -carbon—amide nitrogen bond
(psi): angle around the -carbon—carbonyl carbon bond
In a fully extended polypeptide, both and are 180°
Three bonds separate sequential α carbons in a polypeptide chain. The N—C_α and C_α—C bonds can rotate, described by dihedral angles designated and , respectively. The peptide C—N bond is not free to rotate. Other single bonds in the backbone may also be rotationally hindered, depending on the size and charge of the R groups.

queen_honey_blossom answered 1 year ago

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