Identify the peaks of the 1D ¹H NMR and identify the amino acid at physiological pH. 10 Q K a. serine b. proline c. alanine d. aspartate e. glutamate 6 5 ppm 3 2 1
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- The image below is a positive ionization mode Electrospray ionization-mass spectrum (ESI-MS) spectrum for a peptide, obtained using high resolution mass spectrometry. If ionization occurs through de-protonation (assuming that the mass of a proton is 1.0 Da), what is the neutral mass of the peptide, in Da? 627.271 627.604 100 - 627.938 628.271 628.604 628.938 627.0 628.0 629.0 mass/charge (m/z) 628.271 626.271 1878.813 O 1884.813 % Abundance4. For the Amino Acid you have been assigned, at the pH values provided, draw the structure(s) at each of the specified pH values. serine and pH = 0, 7, and 9 5. What is the overall charge for each of the structures you drew?Among these protein assays, which work in acidic conditions? a. Biuret assay b. Bicinchoninic acid assay c. Bradford assay d. Lowry assay
- The amino acid histidine has ionizable groups with pKa values of 1.8, 6.0, and 9.2, as shown. COOH H₂N-CH CH₂ H 2 -N H lonizable group 6.0 1.9 7.94 0.11 N H CH -COOH H₂N-CH | CH₂ H 2 N 1.8 COO- I pk₁ C H COO- CH -HisH+ H₂N-CH 6.0 COO- pk ₂. CH₂ H 2 H -His N CH COO™ H₂N-CH 9.2 pk 3 CH₂ H -N с H —NH — —NH, A biochemist makes up 95 mL of a 0.11 M solution of histidine at a pH of 5.1. She then adds 60 mL of 0.10 M HCI. What is the pH of the resulting solution? N CHMost of the ultraviolet absorption of proteins at 280 nm is due to their content of a. Glutamate b. Tryptophan c. Alanine d. AspartateComplete the table for the ionizable groups of the fictitious amino acid hypothetinine. pka (to TWO decimals) Average charge of group when pH=pK (to ONE decimal) Group Ka alpha-carboxyl 1.38 x 103 alpha-amino 6.02 x 10-10
- Identify the following antioxidant molecule. A. alpha tocopherol hydroquinone B.dehydroascorbic acid CH3 CH3 C. alpha tocopherol semi-quinone \ / D. ascorbic acid C = C E. alpha tocopherol quinone / \ : O – C C – O CH3 \\ // \ / C – C C – CH2–CH2–CH2–CH–CH2–CH2–CH2–CH–CH2–CH2–CH2–CH–CH3 / \ / l l l CH3 CH2– CH2…Modify isoleucine to show its structure at pH 1 and pH 13. Modify each amino acid by adding or removing atoms or bonds and by adding charges where appropriate. pH 1 pH 13 Select Draw Rings More Erase Rings More Erase C с CH₂ CH₂ H₂C H₂N 1 CH₂ | CH | 310 H― H O H N U с || 0 H Q2 Q Select Draw / ||| ||| H₂C H₂N 1 CH₂ | CH - n O H | H 0 H N H Q2Q. Identify the following antioxidant molecule. A. alpha tocopherol hydroquinone dehydroascorbic acid CH3 CH3 C. alpha tocopherol semi-quinone \ / D. ascorbic acid C = C E. alpha tocopherol quinone / \ : O – C C – O CH3 \\ // \ / C – C C – CH2–CH2–CH2–CH–CH2–CH2–CH2–CH–CH2–CH2–CH2–CH–CH3 / \ / l l l CH3 CH2– CH2 CH3 CH3 CH3
- The amino acid histidine has ionizable groups with pKa values of 1.8, 6.0, and 9.2, as shown. COOH H₂N-CH | CH ₂ pH = CH lonizable -COOH group COO- H₂N-CH 1.8 pk₁ CH2 H -COO- CH -HisH+ COO- H₂N-CH 1 6.0 pk2 CH ₂ H H N -His CH -NH COO- H₂N-CH 1 9.2 pk₂ CH2 -NH₂ H -N CH A biochemist makes up 80 mL of a 0.11 M solution of histidine at a pH of 5.1. She then adds 60 mL of 0.10 M HCl. What is the pH of the resulting solution?Q1. Eticlopride is a dopamine antagonist, which can block dopamine receptor sites and influence levels of dopamine. The molecule is involved in a number of intermolecular interactions with amino acids in the G protein-coupled receptor. о но ČI Eticlopride i) Draw a suitable diagram to indicate where the following amino acids might interact with the molecule: phenylalanine; valine; histidine; tyrosine. In your answer, please draw the amino acids and show the interaction. ii) For each interaction you have shown, state the nature of that interaction (e.g. H- bonding, pi-pi etc.). Describe the pH range of acceptable buffering behavior for the amino acids alanine, histidine, aspartic acid, and lysine.