What is the charge on the following peptide at standard biochemical pH? S-Y-D-F-K-I-V-F-L-L +2 -1 O 0 0-2 +1
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- Which of the following peptides will likely form an irregular structure? A-D-I-E-L-Y-F-H-I-C-V-D-E A-R-E-G-H-Y-D-G-C-Q-S-G A-R-E-V-H-Y-D-I-C-Q-S-F A-R-E-F-C-Y-D-I-C-Q-S-PIdentify the sequence'of the peptide below. C-N-CH-COOH C-N-CH- H H CH- H,N*-CH-Ċ-N-CH-Ċ-N-CH-Ö-N-CH-Ċ- H CH, CH2 ČOOH H CH, H CH, H CH, CH, CH, CH2 *NH, H CH, он CH, SH S CH, O CAEKGSM O MSGKEAC O CAKEGMS O KEACMSGWhat products are formed when each peptide is treated with trypsin? Be sure to answer all parts. [1] Phe-Leu-Phe-Asn-Lys-Ser [2] Phe-Ser-Thr-Arg-His-Trp [3] Met-Met-Lys-Val-Asp-His-Thr-Thr-Tyr-Ala-Thr-Glu
- Assign IUPAC names to each of the following small peptides.Gly-Ala-Leu Gly-Tyr-Ser-SerConsider the following two peptides: I. N-Pro-Pro - Glu - Glu - Tyr - His - Cys - Ala - Glu - Gln - Lys - Leu - Ser - Ser - Phe-Leu- Thr - C II. N-Pro-Pro - Lys - Arg - Gly - Tyr - His - Gly - Glu - Asp - Glu - Asp - Glu - Ser - Gly-Phe- Tyr-C Give three reasons why_peptide I is more likely to form an alpha helix in aqueous solution at pH 7.0. Your reasons may include why_peptide Il is less likely to form an alpha helixWhat will be the result for each qualitative test if the intact casein contains the following peptide chain: Ala-Arg-Asp-Glu-Gly-His-Ile-Leu-Lys-Met-Phe-Pro-Ser-Thr-Trp-Tyr-Val What will be the result for each qualitative test if hydrolysis of casein results to the following: Acid hydrolysis = Total hydrolysis of peptide bonds; Trp is destroyed and converted to humin (black pigment); Thr and Ser are destroyed; Asn and Gln are converted to Asp and Glu Basic hydrolysis = Total hydrolysis of peptide bonds; promotes racemization; Thr and Cys are lost; Arg is destroyed
- A tetrapeptide, glutamate-glycine-alanine-lysine, is prepared at at concentration of 1 mM (0.001 M) and is measured in the standard setup (pathlength of 1 cm). What is the approximate absorbance of this peptide at 280 nm? Hint: if the peptide contained a single tryptophan, the answer would be about 10. 10 280 1 0What is the net charge at pH 7 on a peptide with the following sequence? Gly-Ala-Lys-Phe-Asp-Met-Val-Pro-Arg-Ala-LeuCalculate the net charge of the following peptide at pH 2, pH 6 and pH 14 (use 2 and 9 as pKa values for the carboxylic acid and amino groups, respectively, use the attached table for the side chain pKa values). Ile-Leu-Ile-Lys-Glu-Cys-His-Glu-Met-Ile-Ser-Thr-Arg-Tyr
- Consider the following peptide: Lys-His-Asp-Glu-Phe-Cys-Ala-Asp-His-Arg What is the net charge of this peptide at pH = 1? What is the net charge of this peptide at pH = 14?H CH₂ H₂C HC-CH3 CH₂ H H₂C (S) H₂C H CH₂ CH₂ CH₂ NH O C NH NH₂ a) Which of the following statements about this peptide are correct? Group of answer choices Treatment of this peptide with trypsin generates two products. This peptide is a substrate for carboxypeptidase A Treatment of this peptide with cyanogen bromide generates a pentapeptide and a tripeptide. Treatment of this peptide with chymotrypsin generates three products. Treatment of this peptide with elastase generates 2 products. None of the above statements are correct. b) What is the sequence of this peptide using one letter abbreviations? c) What is the pH which would correspond to the ionization of the peptide as drawn above? 1, 5, 7, 10, 14A peptide has the sequence Glu-His–Trp–Ser-Gly–Leu-Arg-Pro–Gly The pK, values for the peptide's side chains, terminal amino groups, and carboxyl groups are provided in the table. Amino acid Amino pKa Carboxyl pKa Side-chain pKa glutamate 9.60 2.34 4.25 histidine 9.17 1.82 6.00 tryptophan 9.39 2.38 serine 9.15 2.21 glycine 9.60 2.34 leucine 9.60 2.36 arginine 9.04 2.17 12.48 proline 10.96 1.99 Calculate the net charge of the molecule at pH 3. net charge at pH 3: