C9. The peptide “backbone" consists of repetitive "“units" of amino group nitrogen-alpha carbon-carbonyl carbon, moving from the N-terminus to the C-terminus.
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- N. HN H3N Where on this amino acid does it attach to a primary sequence of a protein and where is the ionizable position of the R group?D. Draw the structure of Histidine and Imidazole. Why do you think we use Imidazole to elute the protein? Why do we use a 6X His tag?A. Consider the dipeptideVal–Pro: What amino acid is the N terminal aminoacid? What amino acid is the C terminal aminoacid? How are the amino acids connected? Give the name of the dipeptide. Give the name of the dipeptide in which the amino acid order is reversed as Pro–Val.
- a. The graph to the right displays the degree of helicity that was measured for a peptide as nine additional amino acids were sequentially added to the initial amino acid. Describe the reasons that the helicity curve takes the shape that it does as amino acids are added on to the small peptide.B. Enumerate all the possible DNA nucleotide base sequence for the amino acids given. 4. Met – Leu – Ala - Gly- Glu - Gly- Gln- Glu- Ala - Ala - Pro - LeuAfter a polypeptide chain has been synthesized, certain amino acids in the peptide may become modified. For each modified amino acid, identify the standard amino acid from which it is derived. Enter the unabbreviated name of the standard amino acid. OH I *NH,CH,–C–CH,CH,—CH–COO H C *NH₂ standard amino acid: Identify the modification that yields the first amino acid depicted. addition of a hydroxyl group addition of an amino group modification of the existing amino group modification of the existing hydroxyl group elongation of the side chain by the addition of a -CH₂- group
- The sequence of a peptide is given below. Ala-gly-val-leu-trp-lys-ser-phe-arg-proWhich peptide bond(s) are cleaved by chymotrypsin(Please ASAP. Thank you. How does the mutation change/affect the structure of the Hb heterotetramer (ie how is quaternary protein structure affected)?a. Use three-letter amino acid abbreviations to write the representation for the tripeptide shown here. i H₂N-CH-C-N-CH-C-N-CH-C-0- CH₂ H -NH H ī CH₂ SH -CH-C-0- CH-OH CH3 b. Give the full name of the amino acid at the C-terminal end of this tripeptide. H₂N-CH-C-N-CH-C-N-CH-C-O- -CH-C-N-CH-C CH₂ c-o- CH₂ OH
- 9. H. State if/how Aureliano's mutation changes the amino acid sequence and describe the effect that change has, if any, on the protein.Draw the structure of this peptide: N-Met-His-Tyr-Leu-Asp-Ser-Arg-Leu-CPEPTIDE #1: Pro-Phe-Thr-Cys PEPTIDE #2: Gly-Tyr-Ser-Asp Calculate the pI of both peptides. Which is more acidic and why? Which one is more hydrophobic? Which peptide sequence (#1 or #2) would be more likely situated on the surface of the protein?