Polar Amino Acids: These amino acids have side chains that are hydrophilic and can form hydrogen bonds with water.Examples include serine, threonine, cysteine, asparagine, and glutamine. Non-Polar ...

The change of the relative numbers of the polar and non-polar amino-acids as a result of a mutation must produce big changes in the protein structure.

Both of these amino acids are non-polar and aliphatic and have a four-carbon side chain emerging from the basic amino acid structure. The skeletal structure of leucine is shown below.

Based on their calculations, Zewail and his colleague argue that hydrophobic interactions between non-polar amino acid residues are sufficient to fold a polypeptide chain into its native shape in ...

“The main bitter peptides hold in their chains non-polar amino acids situated at the middle or the extremity of the peptide chain and this structural characteristic is fundamental for the interaction ...