I think I have a better idea of what you mean. Diagrams are good in Chemistry.
My thinking is this (it may be wrong)
Given the glycine molecule has formula
H2NCH2COOH and the carbon backbone you have given . Glycine is an amino acid NOT a protein
you keep on mixing up the two concepts. Read up on the relationship between amino acids and proteins. Do this. The groups are key to this.
See the molecule image below (1) from wikipedia, which has an amine group (NH2
) at one end and carboxylic acid group (COOH) at the other end
can attach a H+
ion. Therefore glycine can act as a base.
The COOH can release a H+
ion. Therefore glycine can act as an acid. Read up about COOH and you will see you don't consider O-
on its own. The COO-
is considered more a single entity.
This gives your version of glycine.
Because of this behaviour, glycine is soluble in water.
I have copied the generic diagram(2) from http://www.chemguide.co.uk/organicprops/aminoacids/background.html
Note the structure where NH2
and COOH are close to each other, not at opposite ends of the molecule. I guess this has biological significance. Read the comment in chemguide on zwitterions. Glycine is the simplest amino acid and is the only one where NH2 and COOH are at opposite ends of the molecule ONLY because the central carbon chain has one carbon. This is not typical.
Given the above, where does that get you?