BioPHYSICAL chemistry

16 CHAPTER 1 BASIC THERMODYNAMIC AND BIOCHEMICAL CONCEPTS

COO

H 3 N C H

H C

CH 2

CH 3

Isoleucine

(Ile, I)

CH 3

COO

H 3 N C H

CH 2

CH

H 3 C CH 3

Leucine

(Leu, L)

COO

H 3 N C H

CH

H 3 C CH 3

Valine

(Val, V)

COO

H 3 N C H

CH 3

Alanine

(Ala, A)

COO

H 3 N C H

H

Glycine

(Gly, G)

COO

H 3 N C H

CH 2

C

N

H

CH

Tryptophan

(Trp, W)

COO

H 3 N C H

CH 2

OH

Tyrosine

(Tyr, Y)

Phenylalanine

(Phe, F)

COO

H 3 N C H

CH 2

Aliphatic amino acids

Amino acids with aromatic rings

Amino acids with hydroxyl side chains Positively charged amino acids

COO

H 3 N C H

H C

H

Serine

(Ser, S)

OH

COO

H 3 N C H

H C

CH 3

Threonine

(Thr, T)

OH

COO

H 3 N C H

CH 2

CH 2

CH 2

CH 2

NH 3 

Lysine

(Lys, K)

COO

H 3 N C H

H

CH 2

CH 2

CH 2

N

C NH 2 

NH 2

Arginine

(Arg, R)

C

COO

H 3 N C H

CH 2

C

Histidine

(His, H)

HN NH

CH

H

Figure 1.8The 20 standard amino acids found in proteins.