Question

The side chains of threonine has a tend to break a α-helix when two threonine are adjacent in a protein because...........
a. steric collision occurs between the large side chains
b . electrostatic repulsion occurs between the two side chains
c . threonine are very hydrophobic
d . the side-chains of threonine can form hydrogen bonds
e . covalent interactions occur between the two side chains

I cant seem to find the answer. I know Threonine is a polar amino acid. SO, is d) correct?

Answer 1

i also think it is D @zyydao

Answer 2

research a as well. I find reference to d and a online.

Answer 3

I found this: "Branching at the β-carbon atom, as in valine, threonine, and isoleucine, tends to destabilize α helices because of steric clashes.", so i think im going with (a). Thanks for help:)