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Determine the charge rang for Glu. What is the max. positive charge it can have (if pH conditions are okay)? What is the max. negative charge?
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- 80mL of a 0.3M solution of hexapeptide Leu-His-Cys-Glu-Asn-Arg is adjusted to pH=pl. The solution is then titrated with 0.2M HCI to a final pH of 2.1. Sketch the titration curve, labelling the pH and volume axes. Indicate the volume of HCl needed to reach each relevant pKa value and equivalence point(s). Relevant pka values are: 2.1, 4.3, 6.0, 8.3, 9.8, and 12.5.Calculate the pI of the peptide KLMRDSP (pKa = 3.5, 3.9, 9.5, 10.0, 12.5).Sketch a titration curve and the structures of the major ionic forms of glutamic acid that exist in solution at the noted parts of the titration curve. Refer to the fully pronated glutamic acid and the pKa.
- Calculate the pI of (a) Ala, (b) His, and (c) Glu.Sketch out the titration curve below and the structure(s) of the major ionic form(s) of glutamic acid that exist in solution at the noted parts of the titration curve. Refer to the fully protonated glutamic acid and the pKaCalculate the pI of aspartate amino acids:
- Titration curve of an unknown amino acid The graph below shows a curve, which was obtained following titration of an unknown amino acid. Include a suitable descriptive title stating the identity of the unknown amino acid Use rectangles to precisely outline the regions in the graph where ionisable groups show buffering activity (base/acid ratio 1:10 to base/acid ratio 10:1); clearly associate the name of the ionisable group with the buffering regions; indicate within the graph all observable titration mid-points and all observable titration end-points and indicate estimates of the pKa of the three functional groups (do not provide pka values from the literature, you need to read the pka from the titration curve provided). Note that it is not possible to estimate the pka with more than one decimal precision due to limited resolution of the shown graph.Consider the following pH titration curve of a diprotic acid. What is the approximate values for pka 1 and pka 2? the curve is attached below.Draw the dominant form(s) AND indicate the percent composition of each form of glutamic acid when the pH is adiusted to 4.25.
- 80mL of a 0.3M solution of hexapeptide Leu-His-Cys-Glu-Asn-Arg is adjusted to pH=pI. The solution is then titrated with 0.2M HCL to a final pH of 2.1. Sketch the titration curve, labelling the pH and volume axes. Indicate the volume of HCL needed to reach relevant pKa value and equivalence point(s)z Relevant pKa values are: 2.1, 4.3, 6.0, 8.3, 9.8, and 12.5.Given this: Protein Isoelectric pH Molecular weight (kDa) Ovalbumin 4.6 45 Insulin 5.4 5.7 Fibrinogen 5.8 340 Y-globulin 6.6 160 Collagen 6.6 115 Hemoglobin (monomer) 7.1 16 Мyoglobin 7.0 16.7 What is the appearance after visualization of a protein mixture containing the seven proteins above when subjected to SDS-PAGE?b. Please draw the structure of the polypeptide: threonine-lysine-glutamine-valine at pH 7.0, and identify the alpha carbons. C. Estimate the isoelectric point of the polypeptide in (b.)?
