1) A) Show the ionization reaction for the side chain of cysteine. B) Why does the arginine side chain have such a high pKa (why is it such a strong base?) C) For the D/L system of designating stereochemical configuation, the molecules are compared to the D and L
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- In a paragraph form provide the experimental procedure of the reaction of oxazetidine-containing peptides and α-ketoacid that will result in protein that contain native serine residuesFor ph of 7 would the structure of arginine be the original structure with 1 NH2 group and 1 NH3+ group?With reference to the following peptide: (a) Identify the N-terminal and Cterminal amino acids. (b) Name the peptide using one-letter abbreviations. (c) Label all the amide bonds in the peptide backbone.
- Given the following peptide SEPIMAPVEYPK(a) Estimate the net charge at pH 7 and at pH 12. Assume the pKa valuesgiven in as shown. (b) How many peptides would result if this peptide were treated with(1) cyanogen bromide, (2) trypsin, or (3) chymotrypsin?(c) Suggest a method for separating the peptides produced by chymotrypsintreatment.Draw the resonance forms of a protonated guanidino group, and explain why argininehas such a strongly basic isoelectric pointDraw the amino acid with the one letter designation “Y,” at a pH of 11.
- Explain why, when the guanidino group of arginine is protonated, the double-bonded nitrogen is the nitrogen that accepts the proton.Explain why, when the guanidino group of arginine is protonated, the double-bonded nitrogen is thenitrogen that accepts the proton. 2 H+ + NH2NHCH2CH2CH2CHNH +NH3CO−O CO−O H2NC NHCH2CH2CH2CHWhat type of interaction (IMF) would be present between side chains of the following amino acid residues? Explain your answers. a) 2 phenylalanine residues b) Methionine and valine residues c) Glutamate and arginine residues
- The Arg-Gly-Asp tripeptide (RGD) is a well-known tumour targeting peptidemotif. Explain how you would synthesise H-Arg-Gly-Asp-OH, starting fromthe constituent amino acids? Explain all steps that are necessary and discuss amechanism for one side chain protection and one C terminus protection.Given the following peptideSEPIMAPVEYPK(a) Estimate the net charge at pH 7 and at pH 12. Assume the pKa valuesgiven in Table (b) How many peptides would result if this peptide were treated with(1) cyanogen bromide, (2) trypsin, or (3) chymotrypsin?(c) Suggest a method for separating the peptides produced by chymotrypsintreatment.Glycine has pKa values of 2.34 and 9.60. At what pH does glycine exist in the indicated form?