Write structural formulas for the two dipeptides that contain leucine and aspartate.

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Hey, everybody. Our next problem says provide two dipeptide using structural formulas that contain prolene and searing. So we know we'll have our amino acid backbone with our, our groups for prolene and sine. So it's first draw the, look up the R groups. So we know it will be drawing and then we need two dipeptide. So with these two amino acids in them, and obviously, we draw them in the two different orders, one with prolene as the N terminal and seine as the C terminal and one in the opposite way. So there are groups for prolene. Now, prolene is an unusual one because it's, our group is a ring coming back on to its backbone. So we have NH two only in the case of prolene. It's just NH because that ring coming around will mean there's only one hydrogen on that nitrogen and then our alpha carbon and then our carbon carbon. And in this case, the R group coming from the ALF carbon is a ring in which there are three carbons and it connects up with the nitrogen in the backbone. So that's a pretty unusual one. And then for searing my R group is a little more normal C H2O H. Now I like when I'm drawing these structures to sort of do two different colors to keep things straight. I'm drawing my art groups in red. So in, for pele, I did the backbone atoms in blue and then the lines of the chain that ring that goes back around in red. So let's start with our first dipeptide. We'll make that with prolene as the N terminal and seine as the C terminal. So we draw our NH two but it's prolene again. So let's get rid of one of those hydrogens. It is bound to the alpha carbon. Oh We need to add a hydrogen to our alpha carbon there to the alpha carbon and then the carbon. So that's the backbone for our prole and then the carbon, you will have that peptide bond to the NH two group of the next amino acid. But of course, that will also be just NH since it's going to continue on, I like to highlight personally the peptide bonds in blue. So I keep track of when I'm transitioning to a new amino acid. So I've highlighted that bond between the carbon group and the nitrogen. So now I just have to draw that ring for my r group of the prolene. So again, that goes from the alpha carbon and it links it to the nitrogen. So it has three CH two groups or alpha carbon bonded two ch two bonded to CH two bonded to CH two, which is then linked to the nitrogen. So there's our prolene. Can I drew that ring in red, I've added the NH from the seine. Then I need my alpha carbon. So ch and then my carbon carbon C double bond to an O, this is the C terminal. So now I add an oh there no more peptide bonds. And now I just mean my Cine R group, it's attached to the alpha carbon. So it'll be CH two and then oh so you see we've got proline and then sine. So there's one dipeptide that's pillow yellow highlight bracket around that. And then the second bi BPT would have sine as our n terminal amino acid. So we'll draw NH two leave the two hydrogens there since this is a more typical R group bonded to our alpha carbon bonded to that C double bond. O brought it to the NH which is the next amino acid. So again, I'm gonna highlight the peptide bond between the carbonyl carbon and the amid nitrogen. Draw my searing R group. So attached to the alpha carbon, I have ch two attached to that is oh so there is searing and now I just need to finish my prolene. So I have NH but it's prolene, it has that ring. So let's erase the hydrogen and then that nitrogen is attached to the carbon carbon, not the carbon, the alpha carbon. Excuse me, which is then attached to the carbon carbon. This is ac terminal. So that carbon carbon has an O group on it just have to add my R group, which again is that ring between the alpha carbon and the nitrogen of the backbone. With that ring containing the three ch two groups. So in this case, I have sine first and then prolene. Again, it's a dipeptide that contains both sine and prolene, but just in the other order. So we have our answer here are two dipeptide with again, Prolene as the N terminal, Sirine as the C terminal and then seine as the N terminal prolene as the C terminal. See you in the next video.

Write structural formulas for the two dipeptides that contain leucine and aspartate.

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Key Concepts

Dipeptides

Amino Acids

Structural Formulas