Biochemistry in Tables, Schemes, and Graphs - S.D. Zhamsaranova 2009

Structure and Characteristics of Proteinogenic Amino Acids

Class="center">

Classification of amino ACIDS BY THEIR CHEMICAL Structure

Amino Acids

Symbols

M

Dissociation constants

pI

Rus.

Lat.

pK1

pK2

pK3

Glycine

Гли

Gly,G

75

-

-

-

5.97

Alanine

Ала

Ala,A

89

2.39

9.69

-

6.0

Valine

Вал

Val,V

117

2.32

9.62

-

6.0

Leucine

Лей

Leu,L

113

2.36

9.60

-

6.0

Isoleucine

Иле

Ile,I

113

2.26

9.62

-

5.9

Serine

Сер

Ser,S

105

2.21

9.35

-

5.7

Threonine

Тре

Thr,T

119

2.15

9.12

-

5.6

Cysteine

Цис

Cys,C

121

1.71

8.33

10.8

5.0

Methionine

Мет

Met,M

149

2.28

9.21

-

5.7

Phenyl

alanine

Фен

Phe,F

165

1.83

9.13

-

5.3

Tyrosine

Тир

Tyr,Y

181

2.2

9.11

10.1

5.7

Tryptophan

Три

Trp,W

204

2.38

9.30

-

5.9

Proline

Про

Pro,P

115

1.99

10.0

-

6.3

Asparagine

Асн

Asn, N

132

2.19

9.11

-

5.41

Glutamine

Глн

Gln,Q

146

1.98

9.10

-

5.65

Histidine

Гис

His,H

155

1.78

5.97

8.97

7.6

Lysine

Лиз

Lys,K

146

2.20

8.90

10.3

9.7

Arginine

Арг

Arg,R

174

2.18

9.09

13.2

10.9

Aspartic acid

Асп

Asp,D

133

1.88

3.65

9.00

2.8

Glutamic acid

Глу

Glu,E

147

2.19

4.25

9.07

3.2

CLASSIFICATION OF AMINO ACIDS BASED ON SIDE CHAIN POLARITY

ACID-BASE EQUILIBRIUM IN SOLUTIONS OF a-AMINO ACIDS

PENTAPEPTIDE

R1, R2, etc. represent amino acid side chains. The peptide backbone of the molecule is highlighted with bold lines.



Last update: 06/08/2026

Editorial and Educational Adaptation: This material has been compiled based on the primary/original source text. The project team performed an editorial review, corrected technical inaccuracies, structured sections, and adapted the content for an educational format.

What was processed:

  • elimination of formatting defects (OCR errors, structural breaks, corrupted characters);
  • editorial organization of content;
  • standardization of terminology in accordance with academic sources;
  • verification of factual statements against the original source text.

All mentions of the author, publication year, and origin of the primary text have been preserved in accordance with the source.