HN H3Ñ® Where on this amino acid does it attach to a primary sequence of a protein and where is the ionizable position of the R group?
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- 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.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.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.
- 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 the structure of the peptide: Val-His-Leu-Thr-Pro-Val-Glu-Lys-Ser-Ala-Val-Thr What is the significance of the peptide described?Amino acids project from each polypeptide backbone in a β-sheet in an alternating fashion (oneabove the plane and the next below the plane – see Fig 3.8B). Consider the following proteinsequence: Leu-Lys-Val-Asp-Ile-Ser-Leu-Arg-Leu-Lys-Ile-Arg-Phe-Glu.a. Is there a pattern to these amino acids? If so, what is it? b. What does this sequence of amino acids mean for the hydrophobicity/hydrophilicity of theresulting β-sheet? c. Can you make a prediction about how the β-sheet will be arranged in higher levels of protein structure? If so, what prediction would you make?
- 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?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)PEPTIDE #1: Pro-Phe-Thr-Cys PEPTIDE #2: Gly-Tyr-Ser-Asp Calculate the pI of both peptides. Which is more acidic and why? Which one is more hydrophobic? Which peptide sequence (#1 or #2) would be more likely situated on the surface of the protein?
- 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?Draw peptide Pro-Ser-Ala-Phe-Glu as you would see it at pH 7. Include stereochemistry.Which of the following amino acids would you least expect to find on the surface of a water-soluble protein? Explain I Serine Glutamat Lysime Threonine