Protein structure lore

Question 1

What angle is Phi

Answer 1

N terminus angle

Question 2

~How many residues per turn in an alpha helix?

Answer 2

3.6 residues per turn, 5.4A=pitch

Question 3

Describe protein interior polarity

Answer 3

Hydrophobic non-polar interior, polar surface

Question 4

Why are alpha helixes favored conformations?

Answer 4

All h-bonding needs of the backbone are satisfied within the helix, position of side chains also stablilizing

Question 5

What is the make-up of a beta sheet, and why favored?

Answer 5

beta strands, H-bonds accepting/donating capacity satisfied by B strands

(can have anti-parallel H-bonding between strands)

Question 6

What are the Phi angles in beta sheets?

Answer 6

<120 degrees, beta sheets end up looking mildly helical, not flat

Question 7

Are phi or psi angles generally more constrained?

Answer 7

Phi much more constrained

Question 8

Does proline have more or less phi movement? Glycine?

Answer 8

Less, glycine hella

Question 9

Which hand alpha helix most common?

Answer 9

Right-handed, due to L-amino acids

Question 10

What angle is Psi?

Answer 10

Carboxy C terminus angle