Classification based on the side chain group
|
CLASSIFICATION BASED ON THE SIDE CHAIN GROUP /font>/font>
|
-
These are amino acids, having no functional groups attached to the aliphatic side chain. Eg: glycine, alanine, valine, leucine and isoleucine.
-
The amino acid valine, leucine and isoleucine contain branched aliphatic side chains. Hence, they are also known as branched chain amino acids.
![Simple amino acid Simple amino acid](http://14.139.56.154:82/file.php/117/Less_12/Simple_amino_acid.jpg)
Hydroxyl amino acids
-
These are amino acids containing hydroxyl group in the side chain. Eg: serine and threonine.
![Hydroxyl amino acid Hydroxyl amino acid](http://14.139.56.154:82/file.php/117/Less_12/Hydroxyl_amino_acid.jpg)
Sulphur containing amino acids
-
These are amino acids, containing a sulphur atom attached on the aliphatic side chain. Eg: cysteine, cystine and methionine.
![Sulphur_containing_AA Sulphur_containing_AA](http://14.139.56.154:82/file.php/117/Less_12/Sulphur_containing_AA.jpg)
Acidic amino acids
-
These amino acids will have one more carboxyl group attached on the side chain. Eg: aspartic acid and glutamic acid.
![Acidic_amino_acid Acidic_amino_acid](http://14.139.56.154:82/file.php/117/Less_12/Acidic_amino_acid.jpg)
Basic amino acids
-
These amino acids will have some nitrogen containing basic group attached on the side chain. Eg: lysine and arginine.
![Basic aminoacids Basic aminoacids](http://14.139.56.154:82/file.php/117/Basic_amino_acid1.JPG)
Aromatic amino acids
-
These are amino acids containing the benzene nucleus attached on the side chain.
-
Eg: phenylalanine, tyrosine and tryptophan. The nucleus present in tryptophan is known as indole. Presence of aromatic amino acids like tyrosine and tryptophan in protein, proteins absorb light at a wave length of 280nm
![Aromatic amino acid Aromatic amino acid](http://14.139.56.154:82/file.php/117/Less_12/Aromatic_amino_acid.jpg)
Heterocyclic amino acids
-
These amino acids contain a ring, which is having one atom other than carbon atom. E.g.: histidine, proline and hydroxyproline.
-
The proline and hydroxyproline are also called as imino acids, because they contain an imino group instead of an amino group, as found in other amino acids.
Aminoacid derivatives
![Amino acid derivatives Amino acid derivatives](http://14.139.56.154:82/file.php/117/Less_12/Amino_acid_derivatives.jpg)
|
Last modified: Thursday, 17 November 2011, 11:05 AM