The Phi ? and Psi angles of one alpha carbon located in the center of an alpha h

Question

The Phi ? and Psi angles of one alpha carbon located in the center of an alpha helix in myoglobin are -60 and -45°, respectively. Which of the following statements is CORRECT? Select one: a. The alpha carbon described above might belong to a proline residueX b. The alpha carbon described above has identical Phi and Psi as another alpha carbon in the protein c. The alpha carbon described above can have any set of Phi and Psi as long it is within the permissible areas of the Ramachandran plot d. The alpha carbon described above has very similar Phi and Psi as its neighboring alpha carbons

Explanation / Answer

The phi and Psi angles of one alpha carbon located in the centre of an alpha helix in myoglobin are -60 and -45 degree respectively. It is the the graph which defines the phi aginst Psi of amino acid residues in protein structure. This plot is also called as Ramchandran plot. It defines the two angles of Rotation around any number of alpha carbon atoms in protein. So the alpha carbon described above has very similar Phi and Psi as it's neighbouring alpha carbons.

Hence option (d) is correct.

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