Draw the titration curves for the following AA’s: Aspartic acid, Alanine, Lysine, Valine, Serine, and Trrosine.
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Q: What is the pI for histidine?
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Draw the titration curves for the following AA’s: Aspartic acid, Alanine, Lysine, Valine, Serine, and Trrosine.
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- There are a total of six different amino acid sequences for a tripeptide containing one molecule each of serine, valine, and glycine. Using three-letter abbreviations for the amino acids, draw the six possible sequences of amino acids.Histidine is an amino acid with three titratable groups: an -NH3+ group (pKa = 9.2), a -COOH group (pKa = 1.8), and an imidazole (amine-like) group (pKa = 6.0). The titration curve for histidine is shown below with four points highlighted. (a) Identify which point on the titration curve corresponds to the pKa for each of the titratable groups, and which point corresponds to the pI. Explain your choices. (b) Calculate the value of pI for histidineCalculate the pI for the following tri-peptide: Glu-Arg-Lys
- Indicate all the possible sequences for a tripeptide containing alanine, glutamine, and methionine; use the standard abbreviation for each amino acid (Ala, Gln, Met).The bacterially produced antibiotic gramicidin A forms channels in cell membranes that allow the free diff usion of Na+ and K+ ions, thereby killing the cell. This peptide consists of a sequence of Dand L-amino acids. The sequence of a segment of fi ve amino acids in gramicidin A is R-Gly-L-Ala-D-Leu-L-Ala-D-Val-R′. Complete the Fischer projection below by adding the correct group to each vertical bond.Sketch the titration curve for the amino acid aspartic acid.
- 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 =Draw a peptide for cys-asn- pro-gly (Using the same format in picture)Draw an ionization scheme for each of the amino acids Phenylalanine, Methionine, Tyrosine, Asparagine (from the most acidic form to the most basic form) , and show your computation for the pI/IP of each of the amino acids as well. Draw a complete structural representation for the tetrapeptide Phe-Met-Tyr-Asn (NOTE:use the zwitterion form) Give the IUPAC name for the tetrapeptide formation of F-M-Y-N. List all the possible tetrapeptide formed from one of each amino acids Phe-Met-Tyr-Asn? (NOTE: Use the three letter abbreviation code for the amino acids in answering D)
- Calculate the pI for the following peptide: Phe-Lys-Glu-Asp-Lys-Ser-Ala (note: there is only one alpha carboxyl at the C terminus and one alpha amino group at the N terminus and don't forget to take into account the ionizable side chain groups)Give the correct name for the tripeptide Glu-Asp-Ala. Give the IUPAC name for the tripeptide R-G-PConsider the peptide Trp-Arg-Glu-Cys-Gly-Tyr. For the drawings requested below, please show them in zig-zag style, from amino to carboxy terminus, with correct stereochemistry Draw the predominant form at pH = 2 Draw the predominant form at pH = 5 Draw the predominant form at pH = 7 Draw the predominant form at pH = 12