20 amino acids

Gly (Glycine), Ala (Alacine)

Basic hydrophobic

small R groups
H group, CH3 group
first is only achiral amino acid

Val (Valine), Leu (Leucine), Ile (Isoleucine)

Basic hydrophobic

long hydrocarbon chains

Met (Methionine)

Special hydrophobic

Unreactive S

Pro (Proline)

Special hydrophobic

5 membered ring that bonds w/ its own amino group

Trp (Tryptophan), Phe (Phenylalanine)

Special hydrophobic

Extremely bulky aromatic rings

Ser (Serine), Thr (Threonine)

Polar uncharged

Polar hydroxyl group (-OH)

Asn (Asparagine), Glu (Glutamine)

Polar uncharged

Polar carboxamide group (-CONH2)

Tyr (Tyrosine)

Polar uncharged

polar AND nonpolar (b/c -OH and aro ring)

Cys (Cysteine)

Polar uncharged

-SH group; can form disulfide linkages

Gln (Glutamate), Asp (Asparatate)

Acidic/basic group (ACIDIC)

pka: 3-4

deprotonated: COOH = +0 charge
protonated: COO- = -1 charge

Lys (Lysine), Arg (Arginine),

Acidic/basic group (BASIC)

pka: 11-12

deprotonated: 0
protonated: +1

His (Histidine)

Acidic/basic group (BASIC)

pka: 6

imidazole ring

deprotonated: 0
protonated: +1