Nonpolar, Aliphatic

*H3N fe

H

Glycine (gly, G)

*H3N CO

e

Valine (val, V)

*H3N Coy

Phenylalanine (phe, F)

pKa = 3.90

Aspartic Acid (asp, D)

Coz

*H3N COz | a =

*H3N Coy

Y

Alanine (ala, A)

Branched-chain

*H3N Coz

x

Leucine (leu, L)

Aromatic

Tryptophan (trp, W)

*H3N Coz

pKa = 4.07

Glutamic Acid (glu, E)

a

Negative, Acidic

H3

ae Proline (pro, P)

*H3N CO

A

Isoleucine (ile, I)

N COz a.

pKa = 10.46 Tyrosine (tyr, Y)

Charged

*H3N CO

\ “g H

pKa = 6.04 Histidine (his, H)

Polar, Uncharged

*H3N CO eC H2N

Asparagine (asn, N)

*H3N

ag

OH

Serine (ser, S)

CO

*H3N v O* ~NH>

Glutamine

(gin, Q)

*H3N CO 25

Threonine (thr, T)

Sulfur-Containing

*H3N Coz

a

SH

pKa = 8.37

Cysteine (cys, C)

*H3N Coz

© NH3

pKa = 10.54

Lysine (Ilys, K)

*H3N Coz

iy

US

Methionine (met, M)

*H3N COz

NH

BS

HoN NH> pKa = 12.48

Arginine (arg, R)

eel

Positive, Basic