Glycine (Gly, G) – No side chain.

The absence of a side chain allows glycine to play an important role in forming turns and bends in a protein polypeptide.  This glycine ion is an example of a zwitterion, which broadly means an ion which contains both positive and negative charge.  All of the ions shown in these pages are thus zwitterions.  Which atom in this ion carries a positive charge?  Where would you find negative charge?  (Hint: remember delocalization!)