Draw the structure of following peptide: Glu-Asp-His-Cys-Gly-Arg (B) At pH= 10.7 (A) At pH= 2.1
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- Given the following Peptide: Q6 *H;N-Phe-Asp-Ala-Arg-Gy-His-Arg-Asp-Glu-His-Tyr-CO 6a. What is the peptide's net charge at pH 2.0, pH 6.0, pH 7.4, and pH 10.2? (show work) 6b. What is the approximate isoelectric point of this peptide?Asp-Gly-Lys-Glu-Ile-Phe Draw its full chemical structure as it would exist at pH = 7.0. Draw an arrow pointing to each peptide bond. Identify the net charge of the peptide and briefly explain how you arrived at this answer.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)
- 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)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?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)
- 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 histidineGiven the following peptides below, what would be more soluble at the indicated pH? 1. (Gly)20 or (Glu)20 in pH 7.0 2. (Lys-Ala)3 or (Phe-Met)3 in pH 7.0 3. (Gly)20 or (Glu)20 in pH 6.0|| 4. (Ala-Ser-Gly)s or (Asn-Ser-His)s in pH 6.0 5. (Ala-Asp-Gly)8 or (Asn-Ser-His)8 in pH 3.0The melanocyte-stimulating peptide hormone a-melanotropin has the following sequence: Ser-Tyr-Ser-Met-Glu-His-Phe-Arg-Trp-Gly-Lys-Pro-Val (a) Write the sequence using the one-letter abbreviations. (b) Calculate the molecular weight of a-melanotropin, a da'
- Determine the net charge (to the nearest integer) on the following peptide at pH 5 AND pH 12. Estimate the isoelectric point (pl) for this peptide: H2N-Leu-Gly-Lys-Glu-COOH Assume the pK,s for functional groups are: alpha-amino 6. alpha-carboxy sidechain-amino (Lys) 10.5 sidechain-carboxy (Glu) 4.2 O Net charge at pH 5 and 12 is 0 and -2, respectively, pl =6.6 O Net charge at pH 5 and 12 is 0 and -2, respectively, pl =3.1 O Net charge at plH 5 and 12 is +2 and -1, respectively, pl =7.5 O Nct charge at pH 5 and 12 is +1 and -1. respectively,. pl -4.5 2.Given the following sequence present within a large, soluble, globular protein: N-Asn Tyr Ser His Gly Asp Arg Tyr Thr lle Leu Leu Met Glu His Glu Phe Ile Val Pro Gly Pro Phe Thr Val Glu Val Asn -C What secondary structural elements are most likely present in this sequence? Please annotate the sequence to show where these structures begin and end.At physiological pH (i.e. 7.4), polylysine assumes a random structure in solution. Given that the pKa for the e-amino group of lysine is 10.5, under what conditions would you expect polylysine to form an a-helix? Explain your reasoning. Under what conditions would you expect polyglutamate to form an a-helix, given that the pKa for the side-chain COOH group is 4.3?