There are five main classes of amino acids, those whose R groups are: nonpolar and aliphatic aromatic (generally nonpolar) polar but uncharged negatively charged and positively charged. What is the R group on glycine and alanine? What stabilizes each protein structure?.Which interactions are considered to be weak in proteins?.Why is glycine Ramachandran plot different?.Why is proline Ramachandran plot so small?.Why is glycine highly conserved in the evolution of proteins?.What is the difference between alanine and glycine?.How does an R group become positively charged?.How do R groups affect protein structure?.What are the three options for the R group?.How can you tell if an R group is polar or nonpolar?.What is the R group on glycine and alanine?.Within each class there are gradations of polarity, size, and shape of the R groups.
The amino acid backbone is identical on all amino acids (though proline is a bit odd- check it out), and the R groups are different on all amino acids.
The amino acid R group is a term that refers to the variable group on each amino acid. Although these amino acids prefer to remain inside protein molecules, alanine and glycine are ambivalent, meaning that they can be inside or outside the protein molecule. Hydrophobicity increases with increasing number of C atoms in the hydrocarbon chain. Aliphatic R groups are nonpolar and hydrophobic.
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