Draw the tetrapeptide Met-Ile-Lys-Glu at a ph of 7?
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Draw the tetrapeptide Met-Ile-Lys-Glu at a ph of 7?
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- you have the following peptide Arg-Ile-Pro-Leu-Asp-Lys-Glu The net charge on this peptide at pH 7.0 is ?. The net charge on this peptide at 1M HCl is ?.Draw the complete structure of the tetrapeptide Val-Cys-Glu-Ser.Give the correct name for the tripeptide Glu-Asp-Ala. Give the IUPAC name for the tripeptide R-G-P
- Consider the peptide Asp-Lys-Phe-Glu-Asn-Tyr-Gln-Val-Cys. In a single beaker, you treat this peptide with 2 proteases. One protease cleaves at the N-terminus of aromatic R groups and the other cleaves at the C-terminus of polar, non-ionizable R groups. Following the enzymatic digestion, you want to separate your peptide fragments so that you can identify them. You choose to separate the fragments using an anion exchange column. Beginning at pH=6 you apply your peptide fragments to the column and you gradually decrease the pH of the column stopping the separation when the pH of the column equals 4. Omitting chemical structures, write the amino acid sequence of the peptide fragments that are produced from this digest. Write the order that these fragments will elute from the column (if at all). (Relevant pKa values are: 2.1, 3.8, 4.3, 8.3, 9.6, 10.1, and 10.5)Describe the chemical difference between mannose and heptyl alpha-D-mannose. Why does FimH have a higher affinity for heptyl a-D-mannose versus methyl a-D-mannose?Given the peptide Val-Ser-Gln-Lys The lateral chain of one of these amino acids can be modified by N-acetylation. Write the semi‐developed form of the lateral chain of this modified amino acid at pH 7 The lateral chain of one of these amino acids can be modified by phosphorylation. Write the semi‐developed form of the lateral chain of this modified amino acid at pH 7.
- The peptide cys-leu-glu-ala-cys-lys is at pH 7 in oxidizing conditions. Part a) Draw the peptide's titration curve. Part b) What would the pI of the peptide be around?Draw Glu-His-Trp-Ser-Gly-Leu-Arg-Pro-Gly peptide. What is the net charge of this peptide at pH 3, 8 and 11? What can you say about pI value of this peptide?A peptide with the primary structure Lys-Arg-Pro-Leu-Ile-Asp-Gly-Ala must be synthesized by the methods developed by Merrifield. Calculate the percentage of the peptides synthesized that will be full length and have the correct sequence if the addition of each amino acid residue is 96% efficient. Do the calculation a second time but assume a 99% efficiency for each cycle. full-length peptides with the correct sequence if 96% efficient: full-length peptides with the correct sequence if 99% efficient: % %
- Given the following pKa data for the individual amino acids, estimate the pI for the tripeptide Thr-Asp-Arg. N-terminal amino group = 9.10 Side chain of aa #1 = Side chain of aa # 2 = 3.86 Side chain of aa # 3 = 12.48 C-terminal carboxyl group = 2.01 PI =Devise a solution-phase synthesis of Ala-Leu-Val-Phe-Met, starting from the requisite Boc-protected amino acidFor the dipeptide Arg–His, find the pI (the pKs are α-amino 9.0, guanidino 12.5, imidazole 6.0, α-carboxylate 2.1).