Problem Set Questions: 1) True or False: Most protein conformational changes inv

Question

Problem Set Questions: 1) True or False: Most protein conformational changes involve breaking and reforming several covalent bonds along the polypeptide chain 2) sidechains on the Fill in the blanks. Soluble proteins have mostly inside and mostly sidechains on the outside. 3) The least restricted and angles are found in polypeptides in which class of secondary structure? a. b. c, d. right-handed helix sheet left-handed helix loop 4) Fill in the blanks. In an helix, the the of residue "i" hydrogen bonds with of residue "i+". 5) Why are helices in naturally occurring proteins almost always right handed? 6) helices have what is known as a helical dipole moment. Explain what this is? would you expect -helices and 310 helices to have these dipoles? why or why not? 7) What is the difference between ribbon, cartoon and cylinder representations of helices?

Explanation / Answer

1. True, Conformational changes occur by breaking and reforming of covalent bond like Disulphide bonds.

2. Soluble proteins have hydrophilic aminoacids on outer side and hydrophobic aminoacids on inner side.

3. Phi and Psi angle are present alternatively in alpha-helices to give Zig-zag helical structure. A is correct.

4. In a alpha helix c=o group of i residue formhydrogen bond with N-H group of i+3 or i+4 residue

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