Pro-Ser-Ala-Phe-Glu. Draw this peptide at pH 7 and include its stereochemistry.
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Pro-Ser-Ala-Phe-Glu. Draw this peptide at pH 7 and include its stereochemistry.
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- Thr-Lys-Pro-Ile-Val-Ala-Pro-Met-Glu-Tyr-Gly-Lys Write the sequence using one-letter abbreviations. sequence: TLPIVAPMGYGK Incorrect Estimate the net charge on the peptide at pH 7. charge at pH 7: +1 Estimate the net charge on the peptide at pH 12. charge at pH 12: 0 IncorrectDraw peptide Pro-Ser-Ala-Phe-Glu as you would see it at pH 7. Include stereochemistry.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.
- Leu-Trp-Phe-Met-Ala-Ile-Val- Draw the structure of the peptide at pH7.4. and Indicate the hydrogen bonds formed in the alpha helix.0ミレーNレ NH geometry on both cand N. Torigonal plannes CH - C-N o=), HN CH2 CH-C-OH (a- carbon) CH2 HooC Aspaxagine - Toline - Valine - Arginine - phenylalcmine - Glutamic ocid. 1.Give the name and three letter code for each amino acid in the peptide. e 2. At pH 7, approximately what charge would be on your peptide? Explain your answer. 3. Can your peptide form intra/interchain disulfide bonds? Explain why/why not. e 4. Will your peptide absorb UV and is it fluorescent? Explain why/why not. e 5. What is the probability that your peptide contains a cis peptide bond? Explain your answer.His-Met-Asp-Tyr-Phe-Ser Calculate an approximate pI (isoelectric point) for this peptide. Please use the pKa's listed within Table 3-1 of Lehninger. Show and/or explain all your work; you must be very clear about WHY you use particular pKa's in your calculation.
- Ala-Arg-Val-His-Asp-Gln Given the polypeptide chain above Estimate the net charge of the polypeptide chain at physiological pH (7.4) and at pH 5.0 . How many peptide bonds are there? What kind of polypeptide is it?peptide Lys-Glu-Trp answer the following questions: Draw the structure of this peptide when all the ionizable groups are fully protonated. How many ionizable groups does this peptide have? Label the pKa for each of the ionizable groups in the structure above. Draw the appropriate titration curve for this peptide on graph paper starting at pH 0 and ending at pH 14. Label the x-axis, y-axis and the pKa Determine the overall net charge of this peptide at each full equivalent point (including 0) where the ionizable group is 100% deprotonated. Determine the pI for this peptide. Determine the average overall net charge of a mixture of this peptide in a solution where pH=8.5.A. Write the structure of the following peptide at pH 5.0 and calculate its net charge at this pH. Asp-His-Tyr-Arg-Lys-Leu-Thr-Gln. Based on the pKa value of the ionizable groups. B. A polypeptide consisting only of L-glutamate residues (poly-L-glutamate) may have a random coil or helical structure depending on pH. Explain this behavior by indicating at what pH values the helical structure will be favored.
- a. Suppose that you have the peptide Ala-Gly-Tyr-His-Leu and you treat it with FDNB and then 6M HCl. Draw the structures of all the products that you will have in solution (assume all reactions to go to completion).Name the peptide* O H O H H,'N-CH-C-N-CH-C-N-CH-C-o CH CH, CH; CH-CH, CH, SH CH, O Methionyl-leucynyl-cycteine Methionyl-leucinyl-cycteine Leucyl-methionyl-cycteinyl Methionylleucyl-cysteineCalculate 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)