Amino Acids

Clicking on the name of the amino acid will download a PDB structure file that can be displayed using a PDB file viewer. If you don't already have a PDB file viewer, try:

Name Symbol Mass (-H2O) Side Chain Occurence (%)
Alanine A, Ala 71.079 
CH3-
 7.49
Arginine R, Arg 156.188 
HN=C(NH2)-NH-(CH2)3-
 5.22
Asparagine N, Asn 114.104 
H2N-CO-CH2-
 4.53
Aspartic acid D, Asp 115.089 HOOC-CH2- 5.22
Cysteine C, Cys 103.145 HS-CH2- 1.82
Glutamine Q, Gln 128.131 H2N-CO-(CH2)2- 4.11
Glutamic acid E, Glu 129.116 HOOC-(CH2)2- 6.26
Glycine G, Gly 57.052 H- 7.10
Histidine H, His 137.141 
N=CH-NH-CH=C-CH2-
|__________|
 2.23
Isoleucine I, Ile 113.160 
CH3-CH2-CH(CH3)-
 5.45
Leucine L, Leu 113.160 
(CH3)2-CH-CH2-
 9.06
Lysine K, Lys 128.17 
H2N-(CH2)4-
 5.82
Methionine M, Met 131.199 
CH3-S-(CH2)2-
 2.27
Phenylalanine F, Phe 147.177 
Phenyl-CH2-
 3.91
Proline P, Pro 97.117 
-N-(CH2)3-CH-
 |_________|
 5.12
Serine S, Ser 87.078 
HO-CH2-
 7.34
Threonine T, Thr 101.105 
CH3-CH(OH)-
 5.96
Tryptophan W, Trp 186.213 
Phenyl-NH-CH=C-CH2-
|___________|
 1.32
Tyrosine Y, Tyr 163.176 
4-OH-Phenyl-CH2-
 3.25
Valine V, Val 99.133 
CH3-CH(CH2)-
 6.48

The amino acid occurence statistics were compiled using the NCBI database.

Contents