Using proper convention, provide the amino acid sequence for the following protein. H₂N-CH-C-N-CH-C-N-CH-C-0° CH₂ I CH₂ CH-OH 1 CH₂ CH₂ T CH₂ ONH₂ CH₂ CH₂ S I CH₂
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- Write the one letter code for the oligopeptide Ser-Cys-Ile-Glu-Asn-Cys-Glu and calculate the total charge on it at pH 4.5.Identify the structure of the predominant form of the pentapeptide at pH = 12 if there is a pentapeptide Ile-Lys-Asp-Phe-GlyTreatment of a polypeptide with 2-mercaptoethanol yields two polypeptides 1. Ile—Val—Cys—Arg—Thr—Gly—Cys—Lys—Asn—Phe—Leu2. Trp—Lys—Cys—Phe—Arg—His—Thr—Lys—Cys—SerTreatment of the intact polypeptide with trypsin yields fragments with the following aminoacid compositions(Arg, Cys2, Ile, Ser, Val)(Arg, Cys2, Gly, Lys, Thr, Phe)(Asn, Leu, Phe)(His, Lys, Thr)(Lys, Trp)Edmands chemistry reveal the following PTH derivatives in equal quantity after cycle 1• PTH--Ile and PTH--Trp a) Rewrite the intact polypeptide, by indicating the positions of the disulfide bonds(Indicate your reasoning) b) How many products do you expect after chymotrypsin cleavage of the intactpolypeptide? c) You are performing an isoelectric focusing experiment (IEF) on a gel with a pH range of 2to 14. Indicate on the diagram below at what point along the gel will peptide 1 abovefocus, in the presence (X) and absence (Y) of DTT. (also show your calculations)
- Draw the structural formulas of the following peptides, andshow which bond would be cleaved by chymotrypsin.a. trp-val-glyb. phe-ala-proDraw the structure of the PTH derivative product you would obtain by Edman degradation of the following peptides: (a) I-L-P-F (b) D-T-S-G-AIdentify the following amino acid (at pH = 7.0): (COO-)–CH(NH3+)–CH2–CH2–CH2–CH2–(NH3+) glutamic acid glutamine aspartic acid lysine asparagine
- Ala-Phe-Pro-Cys-Clu-Arg-Arg-Pro-His-Gly-Lys-Clu Calculate the net charge on the polypeptide at a. pH 1.5 b. pH 8 c. pH 13Given the fragment Ala-Lys-Tyr-Gly-Phe and Leu-Val-Ser-His-Cys-Arg, what is the expected result in both fragments with CuSO4 and NaOH? a. dark violet solution b. light violet solution c. blue solution d. colorless solutionWrite the name of the oligopeptide L-E-T-S-P-R-A-Y using their full amino acid names. Draw the structure of olgopeptide L-E-T-S-P-R-A-Y.
- Write the chemical structure of peptide containing the following amino acid PRO-SER-GLY-LEU I NEED IT ASAP PLEASEDetermine the Primary amino acid sequence of an Octapeptide Composition · Tyr , Arg，Pro, Lys ,Lys ,Met ,Trp，Phe N terminal 1 2 3 4 5 6 7 8 C terminal 1) Treatment with an Edman reagent gives a PTH-AA that shows a Yellow color with Ninhydrin. 2) Trypsin digestion of the Octapeptide gives tetepeptide, dipeptide， free Arg ，free Trp. 3）CNBr = pentapeptide and tripeptide. 4) chymotrysin - tetapeptide and two dipeptiele. The tetrapeptide contains an amino acid with an OH group in the side chain.The bacterially produced antibiotic gramicidin A forms channels in cell membranes that allow the free diff usion of Na+ and K+ ions, thereby killing the cell. This peptide consists of a sequence of Dand L-amino acids. The sequence of a segment of fi ve amino acids in gramicidin A is R-Gly-L-Ala-D-Leu-L-Ala-D-Val-R′. Complete the Fischer projection below by adding the correct group to each vertical bond.