Use the three-letter abbreviations to name all tripeptides that contain valine, methionine, and leucine.

Question

Accepted Answer

Hi, everyone. Our next problem says name the trip peptides using three letter abbreviations that consist of phenylalanine thine and Glycine. We have four different answer choices labeled A through D with different combinations of three, three letter abbreviations. So we'll go into those in more detail. But our first step will be to think about what are the proper abbreviations for the three amino acids that our tripeptide are supposed to be composed of. So first we have phenyl alanine and the proper abbreviation for that is phe remembering that these abbreviations have a capital for the first letter and then two lowercase levelers. The proper abbreviation for thine is T hr and the proper three letter abbreviation for Glycine is gly. And then when we write them out as a polypeptide, we use hyphens to symbolize the peptide bonds between the different amino acids. So we see in each case, our trip peptides have these hyphens between each of the amino acids that make them up. So let's look through our answer choices. Choice A has different combinations of the abbreviations phytregly. Well, what's the problem here? We have the wrong abbreviation for phenylalanine. It's phe not phy and the wrong abbreviation for three Anine which is T hr not tre so choice A can't be correct because it uses the wrong abbreviations. Choice B has different combinations of the abbreviations phyt Hr Gly. So it has the incorrect abbreviation for phenylalanine which should be phe so cross out choice B choice C has combinations of phetregly. So it has the improper abbreviation for Theanine which should be thr so cross out choice C. Well, we've only got one choice left. Choice D must be our correct answer. And indeed, we have different combinations of phet Hr Gly. So we have the proper abbreviations. We see we have two trip peptides with phenyl alanine. First one that is phet hr Gly one that is in the opposite order pheglyt Hr then we have two polypeptides with three anine first and one is in the order three anine glycine phenylalanine, the next 13 anine phenylalanine, glycine and then finally two where we have glycine first, glycine thine, phenylalanine, and glycine phenylalanine thine. So we have our six different combinations of these three amino acids in choice D which correctly abbreviates our amino acids as phet Hr and Gly see you in the next video

Use the three-letter abbreviations to name all tripeptides that contain valine, methionine, and leucine.

Verified video answer for a similar problem:

Key Concepts

Amino Acids

Tripeptides

Three-Letter Abbreviations