amino acids

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Last updated 4:35 AM on 6/14/26
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7 Terms

1
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Nonpolar, non-aromatic

Valine, Leucine, Isoleucine, Alanine, Methionine, Glycine, Proline

2
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Aromatic

Phenylalanine, Tryptophan, Tyrosine (polar)

3
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Acidic (including pKas)

Aspartic acid 3.6, glutamic acid 4

4
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Basic including pKas

Arginine 12.5, lysine 10.5, histidine 6 (remember: not asparagine or glutamine as these are amide forms of aspartic acid and glutamic acid, and amides cannot be deprotonated)

5
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Polar, uncharged AAs

Serine, threonine, asparagine, glutamine, cystine (under oxidising conditions, forms disulfide. pKa 8, deprotonated)

6
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alpha helix structural properties

3.6 residues turn. Internal H-bonds between peptide: NH of i to C=O of i-4. Right handed. 5.4 A of height per turn (3.6 residues). Phi -60, psi -40. Strong ionic interactions between i and i-3. No P or G: helix breakers

7
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beta sheet structural properties