The icon refer to link that should open up in a molecule viewer. If nothing happens on your machine, you might want to install one. RasWin is available for free. If your sgtructure explorer appears empty. try to change the display to spacefill or sticks.
All 20 different amino acids have this same structure, but their side chain groups (the R group) may vary in size, shape, charge, hydrophobicity, and reactivity. The amino acids could be considered as the alphabet in which the proteins are written. Students in biology must be familiar with the special properties of each letter of the alphabet, which are determined by the side chain (R).
|In this group the side chain is aliphatic
. An aliphatic group is hydrophobic.
Glycine, Gly, G
Alanine, Ala, A
Valine, Val, V
Leucine , Leu, L
Isoleucine, Ile, I
|In this group the side chain is an organic acid. The side chain is negatively charged.
Aspartic Acid, Asp, D
Glutamic acid, Glu, E
In this group the side chain is an amide
|In this group the side chain contains a sulphur. They are hydrophobic and cysteines are very reactive.||In this group the side chain is an alcohol.|
|In this group the side chain is an organic base. The side chain is hydrophilic.||In this group the side chain is aromatic. The side chain is very hydrophobic.
In this group the side chain is an imine. This amino acid is found in bends due to its structure.
Two amino acids can, under some circumstances, react together. The result is the creation of a dipeptide. A molecule of water is released in the process. This is the basic reaction involved in the synthesis of proteins.