Draw the line bond structure of the peptide Cys-Gln-Lys fully protonated. Clearly label the C- terminus, N-terminus, charges, and alpha carbons. Upload an image of your answer.
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- Consider the peptide Asp-Lys-Phe-Glu-Asn-Tyr-Gln-Val-Cys. In a single beaker, you treat this peptide with 2 proteases. One protease cleaves at the N-terminus of aromatic R groups and the other cleaves at the C-terminus of polar, non-ionizable R groups. Following the enzymatic digestion, you want to separate your peptide fragments so that you can identify them. You choose to separate the fragments using an anion exchange column. Beginning at pH=6 you apply your peptide fragments to the column and you gradually decrease the pH of the column stopping the separation when the pH of the column equals 4. Omitting chemical structures, write the amino acid sequence of the peptide fragments that are produced from this digest. Write the order that these fragments will elute from the column (if at all). (Relevant pKa values are: 2.1, 3.8, 4.3, 8.3, 9.6, 10.1, and 10.5)A peptide with the primary structure Lys-Arg-Pro-Leu-Ile-Asp-Gly-Ala must be synthesized by the methods developed by Merrifield. Calculate the percentage of the peptides synthesized that will be full length and have the correct sequence if the addition of each amino acid residue is 96% efficient. Do the calculation a second time but assume a 99% efficiency for each cycle. full-length peptides with the correct sequence if 96% efficient: full-length peptides with the correct sequence if 99% efficient: % %Draw a peptide for cys-asn- pro-gly (Using the same format in picture)
- Draw the polypeptide T-R-I-P at pH of 7. Label each residue with the 3-letter code, label the N- and C-termini. What is the isoelectric point of this peptide?Porcine dynorphin is a neuropeptide having 17 amino acid residues. Its structure is shown below. Tyr-Gly-Gly-Phe-Leu-Arg-Arg-Ile-Arg-Pro-Lys-Leu-Lys-Trp-Asp-Asn-Gln 8. How does trypsin catalyze the hydrolysis of peptides? You can answer this question by identifying the amino acids involved and whether the hydrolysis is at their amino side or the carboxyl side or if particular amino acids end up at the N-teminal end or at the C-terminal end. 9. List down the different fragments that would result if dynorphin were cleaved by trypsin. 10. How does chymotrypsin catalyze the hydrolysis of peptides? You can answer this question by identifying the amino acids involved and whether the hydrolysis is at their amino side or the carboxyl side or if particular amino acids end up at the N-teminal end or at the C- terminal end. 11. List down the different fragments that would result if dynorphin were cleaved by chymotrypsin. 12. Cyanogen bromide is a chemical reagent which also cleaves peptide bonds.…Given the peptide Val-Ser-Gln-Lys The lateral chain of one of these amino acids can be modified by N-acetylation. Write the semi‐developed form of the lateral chain of this modified amino acid at pH 7 The lateral chain of one of these amino acids can be modified by phosphorylation. Write the semi‐developed form of the lateral chain of this modified amino acid at pH 7.
- There is another melanocyte-stimulating hormone called β-melanotropin.Cleavage of β-melanotropin with trypsin produces the following peptidesplus free aspartic acid. WGSPPK DSGPYK MEHFRIf you assume maximum sequence similarity between α-melanotropin andβ-melanotropin, then what must the sequence of the latter be?What is the length in AA’s of the LilP protein? Assume fMet is NOT CLEAVED. Write out the sequence of the polypeptide in AA: use the three letter notation, e.g. Met-Ser-Pro-A peptide with the primary structure Lys–Arg–Pro– Leu–Ile–Asp–Gly–Ala is sequenced by the Edman procedure. If each Edman cycle is 96% efficient, what percentage of the amino acids liberated in the fourth cycle will be leucine? Do the calculation a second time, but assume a 99% efficiency for each cycle.
- Determine the codon sequence for the peptide sequence glycylserylcysteinylarginylalanine. How many possibilities are there?draw the structure of the peptide Asp - Asn-Ser-Lys-Pro at PH 8Here is a putative peptide sequence (position number on top of residues): 1 2 3 4 5 6 7 8 9 10 11 12 13 NH2- G C G N V T H N Q C V L S -COOH If expressed in a eukaryotic cell (please mark your answer in the blank space): Position(s) ___ could be N-glycosylated Position(s) ___ could be modified with myristic acid and the bond formed would be a ______________ Position(s) ______and _____ could be modified with palmiti c acid and the bond formed would be a ______________ Positio n(s) ________ could be a segment of a lipid-linked protein with a farnesyl anchor and the bond formed would be a ______________ Position(s) ________ could be a segment of an O-glycosylated protein Position(s) ________ could be modified with a glycosylphosphatidylinositol (GPI) anchor Position(s) ________ could be phosphorylated