My understanding is that protein and DNA helices show the handedness that they do due largely to the intrinsic chirality of their components. Note that in natural biomolecules L-amino acids and D-nucleic acids predominate. This apparently leads to a subsequent bias in their respective polymers.

I believe that it has been demonstrated that artificial alpha helices constructed of achiral amino acids demonstrate inversions between left and right handed forms- these then need to be stapled with extra molecular bridges to hold left or right handed orientation.

Thus, I don't think that there is a right-to-right or left-to-left association. In all cases, I think it's just that the biased handedness is baked into the structure of natural amino acids.

My understanding is that protein and DNA helices show the handedness that they do due largely to the intrinsic chirality of their components. Note that in natural biomolecules L-amino acids and D-sugars predominate. This apparently leads to a subsequent bias in their respective polymers.

I believe that it has been demonstrated that artificial alpha helices constructed of achiral amino acids demonstrate inversions between left and right handed forms- these then need to be stapled with extra molecular bridges to hold left or right handed orientation.

Thus, I don't think that there is a right-to-right or left-to-left association. In all cases, I think it's just that the biased handedness is baked into the structure of natural amino acids.