Hydrogen bonds are a relatively weak type of chemical bond. They're much weaker than the peptide bonds that hold together the protein's backbone or the covalent bond found in a disulfide bridge. But hydrogen bonds are numerous, and they help determine both the secondary structure -- helixes and sheets -- of a protein and its overall shape (or "tertiary structure"). Hydrogen bonds can also occur between sidechains and the backbone atoms of helixes, sheets, and loops.
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