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What are the most flexible and the most rigid amino acids?

amino acids flexible rigid
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What are the most flexible and the most rigid amino acids?

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Glycine is most flexible with no side chain. Proline is most rigid, with an imino group instead of amino. 4. Which amino acids have hydroxyl groups? A: Serine, Threonine, and Tyrosine. These are important in hydrogen bonding. 5. Which amino acid can form disulfide bonds? A: Cysteine. The two cysteine residues linked together are called cystine. These bonds can contribute to the strength of a protein. Insulin contains two peptides linked by disulfide bonds. 6. Where would you likely find non-polar amino acids in the structure of a protein? A: They are more likely found in the central core of the enzyme or in trans-membrane segments that associated with the lipid bilayer. 7. Name the acidic amino acids. A: glutamic acid = glutamate, and aspartic acid = aspartate. The pK of these is around 4. That means at pH=4 they are 1/2 negatively charged, 1/2 uncharged. The higher the pH the more charged they will be. Amount charged at given pH is determined by Henderson-Hasselbalch equation: pH=2, 1

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