00:01
So the question asks you to draw the chemical structure of a protein with three amino acid long and substitute r for each side chain include every atom in the structure and label peptide bond amino an acoboxone so as you can see on a board i draw three amino acid so there are 20 common amino acid those amino acids have some big apart that are in common and they also have their unique side chain so first of all i'm going to talk about the common structures so only amino acid has the center carbon when i use the arrow to point at.
00:35
So it connects with a hydrogen on top.
00:37
And the left side, it connects with amino group.
00:40
If it's in the beginning of the sequence, it's nh3 plus.
00:43
So this is the amino end of the polypeptide.
00:48
The carbon also connect with a coboxy group, c -o -o -h.
00:52
It's on the right side.
00:54
So as you can see, the center carbon amino group and a coboxy group and hydrogen, they're common in all amino acid.
01:04
However, when they make each amino acid different is the side chain.
01:09
So i use r1 and a blue circle to represent the unique side chain of this amino acid number one.
01:16
So now when the first amino acid react with second amino acid, there will be a peptide bond formed between the two amino acids.
01:26
This peptide bond is formed between the coboxer group of the first amino acid...