Side-chain structures in the first turn of the alpha-helix.

  title={Side-chain structures in the first turn of the alpha-helix.},
  author={Simon Penel and Eleri Hughes and Andrew J. Doig},
  journal={Journal of molecular biology},
  volume={287 1},
The first three residues at the N terminus of the alpha-helix are called N1, N2 and N3. We surveyed 2102 alpha-helix N termini in 298 high-resolution, non-homologous protein crystal structures for N1, N2 and N3 amino acid and side-chain rotamer propensities and hydrogen-bonding patterns. We find strong structural preferences that are unique to these sites… CONTINUE READING