Technical articles

List of Natural Amino Acids

Amino Acid

Three-letter

One-letter

AA Mol. Mass

Formula

Residue Mass

Residue Formula

Property

Alanine

Ala

A

89.09

C3H7NO2

71.08

C3H5NO

Neutral, hydrophobic

Arginine

Arg

R

174.20

C6H14N4O2

156.19

C6H12N4O

Basic, hydrophilic

Asparagine

Asn

N

132.12

C4H8N2O3

114.10

C4H6N2O2

Neutral, hydrophilic

Aspartic Acid

Asp

D

133.10

C4H7NO4

115.09

C4H5NO3

Acidic, hydrophilic

Cysteine

Cys

C

121.16

C3H7NO2S

103.14

C3H5NOS

Thiol; easily oxidized

Glutamine

Gln

Q

146.14

C5H10N2O3

128.13

C5H8N2O2

Neutral, hydrophilic

Glutamic Acid

Glu

E

147.13

C5H9NO4

129.11

C5H7NO3

Acidic, hydrophilic

Glycine

Gly

G

75.07

C2H5NO2

57.05

C2H3NO

Neutral, hydrophobic

Histidine

His

H

155.15

C6H9N3O2

137.14

C6H7N3O

Basic, hydrophilic

Isoleucine

Ile

I

131.17

C6H13NO2

113.16

C6H11NO

Neutral, hydrophobic

Leucine

Leu

L

131.17

C6H13NO2

113.16

C6H11NO

Neutral, hydrophobic

Lysine

Lys

K

146.19

C6H14N2O2

128.17

C6H12N2O

Basic, hydrophilic

Methionine

Met

M

149.21

C5H11NO2S

131.20

C5H9NOS

Easily oxidized

Phenylalanine

Phe

F

165.19

C9H11NO2

147.18

C9H9NO

Neutral, hydrophobic

Proline

Pro

P

115.13

C5H9NO2

97.12

C5H7NO

Neutral, hydrophilic

Serine

Ser

S

105.09

C3H7NO3

87.08

C3H5NO2

Neutral, hydrophilic

Threonine

Thr

T

119.12

C4H9NO3

101.10

C4H7NO2

Neutral, hydrophilic

Tryptophan

Trp

W

204.23

C11H12N2O2

186.21

C11H10N2O

Neutral, hydrophobic

Tyrosine

Tyr

Y

181.19

C9H11NO3

163.17

C9H9NO2

Neutral, hydrophobic

Valine

Val

V

117.15

C5H11NO2

99.13

C5H9NO

Neutral, hydrophobic


Categories: Technical articles
Explore topics: Natural Amino

Da — when not otherwise indicated, molecular weight units are daltons.   Mw — weight-average molecular weight.   Mn — number-average molecular weight.

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Cite this article

Aladdin Scientific. "List of Natural Amino Acids" Aladdin Knowledge Base, updated Nov 6, 2025. https://www.aladdinsci.com/us_en/faqs/list-of-natural-amino-acids-en.html
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