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NH2
COOH NH2
COOH
NH2
COOH NH2
COOH
AMINO ACIDS
Dr. M.L. Mini
Associate Professor
Agricultural College and Research Institute,
Madurai
• Amino acids are the basic structural units of proteins.
• 20 different amino acids are found in the structure of proteins.
• These amino acids present in protein are called standard or
protein amino acids.
• There are many other amino acids found free in nature. They
are referred to as non-protein amino acids. Eg. Ornithine,
citrulline.
INTRODUCTION
GENERAL STRUCTURE
C
R
COOH
H

NH2
General formula of
Amino acids
 All protein amino acids have an amino group, and a carboxyl
group attached to the - carbon atom.
 The R-group is referred to as the side chain of amino acids.
 Amino acids differ by the R-group
COOH
NH2
C
CH3
H
COOH
NH2
C
H
H
Alanine Glycine
CLASSIFICATION
Amino acids are classified into four types based on the polarity of
the R groups.
 Amino acids with non-polar (hydrophobic), aliphatic
R groups
 Amino acids with non-polar aromatic R groups
 Amino acids with polar uncharged R groups
 Amino acids with polar charged R groups – Acidic or
Basic
I. Non-polar or hydrophobic aliphatic side chain
1. Glycine Gly G
2. Alanine
Ala A
3. Valine
Val V
4. Leucine Leu L
5. Isoleucine
Ile I
COOH
NH2
CH
H
COOH
NH2
CH
H3C
COOH
NH2
CH
H3C
H3C
CH
COOH
NH2
CH
H3C
H3C
CH CH2
COOH
NH2
CH
H3C
CH3
CH2 CH
6. Proline Pro P
H2C
COOH
NH
CH2
H2C
CH
II. Non-polar aromatic side chain
7. Phenyl alanine Phe F
8. Tyrosine Tyr Y
9. Tryptophan
(Indole ring)
Trp W
COOH
NH2
CH
CH2
COOH
NH2
CH
CH2
OH
CH COOH
NH2
CH2
N
H
III. Polar neutral side chain
10. Serine Ser S
11. Threonine Thr T
COOH
NH2
CH
HO CH2
OH
COOH
NH2
CH
H3C CH
12. Cysteine Cys C
13. Methionine Met M
COOH
NH2
CH
HS CH2
H3C COOH
NH2
CH
S CH2
CH2
14. Asparagine
15. Glutamine
Asn N
Gln Q
O
COOH
NH2
CH
CH2
C
H2N
COOH
NH2
CH
CH2
CH2
O
C
H2N
(Amide group)
(Hydroxyl group)
(Sulphur containing)
16. Aspartic acid
Asp D
17. Glutamic acid
Glu E
IV. Polar Acidic side chain (Negatively charged)
COOH
NH2
CH
CH2
HOOC
HOOC COOH
NH2
CH
CH2
CH2
Polar Basic side chain (Positively charged)
18. Lysine
Lys K
19. Arginine
Arg R
20. Histidine
His H
COOH
NH2
CH
CH2
CH2
CH2
CH2
H2N
C COOH
NH2
CH
CH2
CH2
CH2
NH
H2N NH
CH COOH
NH2
CH2
N
HN
(Guanidine group)
(Imidazole group)

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Amino acids.ppt

  • 1. NH2 COOH NH2 COOH NH2 COOH NH2 COOH AMINO ACIDS Dr. M.L. Mini Associate Professor Agricultural College and Research Institute, Madurai
  • 2. • Amino acids are the basic structural units of proteins. • 20 different amino acids are found in the structure of proteins. • These amino acids present in protein are called standard or protein amino acids. • There are many other amino acids found free in nature. They are referred to as non-protein amino acids. Eg. Ornithine, citrulline. INTRODUCTION
  • 3. GENERAL STRUCTURE C R COOH H  NH2 General formula of Amino acids  All protein amino acids have an amino group, and a carboxyl group attached to the - carbon atom.  The R-group is referred to as the side chain of amino acids.  Amino acids differ by the R-group COOH NH2 C CH3 H COOH NH2 C H H Alanine Glycine
  • 4. CLASSIFICATION Amino acids are classified into four types based on the polarity of the R groups.  Amino acids with non-polar (hydrophobic), aliphatic R groups  Amino acids with non-polar aromatic R groups  Amino acids with polar uncharged R groups  Amino acids with polar charged R groups – Acidic or Basic
  • 5. I. Non-polar or hydrophobic aliphatic side chain 1. Glycine Gly G 2. Alanine Ala A 3. Valine Val V 4. Leucine Leu L 5. Isoleucine Ile I COOH NH2 CH H COOH NH2 CH H3C COOH NH2 CH H3C H3C CH COOH NH2 CH H3C H3C CH CH2 COOH NH2 CH H3C CH3 CH2 CH 6. Proline Pro P H2C COOH NH CH2 H2C CH
  • 6. II. Non-polar aromatic side chain 7. Phenyl alanine Phe F 8. Tyrosine Tyr Y 9. Tryptophan (Indole ring) Trp W COOH NH2 CH CH2 COOH NH2 CH CH2 OH CH COOH NH2 CH2 N H
  • 7. III. Polar neutral side chain 10. Serine Ser S 11. Threonine Thr T COOH NH2 CH HO CH2 OH COOH NH2 CH H3C CH 12. Cysteine Cys C 13. Methionine Met M COOH NH2 CH HS CH2 H3C COOH NH2 CH S CH2 CH2 14. Asparagine 15. Glutamine Asn N Gln Q O COOH NH2 CH CH2 C H2N COOH NH2 CH CH2 CH2 O C H2N (Amide group) (Hydroxyl group) (Sulphur containing)
  • 8. 16. Aspartic acid Asp D 17. Glutamic acid Glu E IV. Polar Acidic side chain (Negatively charged) COOH NH2 CH CH2 HOOC HOOC COOH NH2 CH CH2 CH2 Polar Basic side chain (Positively charged) 18. Lysine Lys K 19. Arginine Arg R 20. Histidine His H COOH NH2 CH CH2 CH2 CH2 CH2 H2N C COOH NH2 CH CH2 CH2 CH2 NH H2N NH CH COOH NH2 CH2 N HN (Guanidine group) (Imidazole group)