Proteins and Enzymes

ID #1047

I understand that amino acids are linked by covalent peptide bonds during protein synthesis. So does that mean that all peptide bonds are covalent because i thought that the peptide bonds in secondary structure are polar?

All peptide bonds are covalent, because of specifically what the peptide bond is.  The peptide bond doesn't physically involve the amino hydrogen or the carboxyl oxygen -- the peptide bond is the covalent link between the nitrogen and the carbon.  So with regards to the lecture material on hydrogen bonding contributing to secondary structure, those hydrogen bonds are non-covalent interactions between a hydrogen near one peptide linkage and an oxygen near a different peptide linkage.  See the difference?

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