Hydrogen Bond
Hydrogen Bond — A weak electrostatic attraction between a hydrogen atom bonded to an electronegative atom and another electronegative atom, stabilizing peptide secondary structures.
What Is a Hydrogen Bond?
A hydrogen bond is a non-covalent interaction between a hydrogen atom bonded to an electronegative atom (donor: N-H, O-H) and a lone pair on another electronegative atom (acceptor: C=O, N). Hydrogen bonds are the primary determinant of peptide secondary structure: alpha-helices form through i to i+4 backbone H-bonds, and beta-sheets form through inter-strand backbone H-bonds.
Significance in Peptide Design
- Structure: Alpha-helix (i, i+4 CO...HN), 310-helix (i, i+3), beta-sheet (inter-strand)
- Permeability: Intramolecular H-bonds shield NH groups, reducing desolvation penalty for membrane crossing
- N-methylation: Eliminates an H-bond donor, freeing the backbone for membrane permeation
Frequently Asked Questions
What is Hydrogen Bond?
A weak electrostatic attraction between a hydrogen atom bonded to an electronegative atom and another electronegative atom, stabilizing peptide secondary structures.
Why is Hydrogen Bond important in peptide research?
Hydrogen Bond is a fundamental concept in chemistry as it relates to peptide science. It directly influences experimental design, compound characterization, and the reliability of research outcomes across biochemistry and molecular biology disciplines.