Solve the peptide problem.1. Write the structure of tripeptide in which the first amino acid is Trp, thesecond one is Glu, and the third one is Asp.Mark its N- and C-ends.What is the pl area of the tripeptide (<<7, near 7, or >>7)? Explain.What is the charge of the tripeptide placed in a buffer solution with pH 9,2?Explain.How do you think, would the Xanthoprotein reaction be positive in the solutionof this peptide? Explain.

A tripeptide is composed of 3 amino acids and have 2 covalent bonds. The tripeptide given in…

Answered: Solve the peptide problem. Write the…

Biochemistry

9th Edition

ISBN:9781319114671

Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Chapter1: Biochemistry: An Evolving Science

Section: Chapter Questions

Problem 1P

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Hi can someone help me please. The picture contains the full structure.
5 For the peptide structure in #3, (ASP-ALA-THR-LYS-GLY), use the chart at the end of this HW set to: A. Determine the net charge of the pentapeptide at pH 3, 4, 7, 10 and 11. B. Estimate the isoelectric point, pl, for this 5-amino acid peptide
Peptide mass determination. You have isolated a proteinfrom the bacterium E. coli and seek to confirm its identityby trypsin digestion and mass spectrometry. Determinationof the masses of several peptide fragments has enabled youto deduce the identity of the protein. However, there is adiscrepancy with one of the peptide fragments, whichyou believe should have the sequence MLNSFK and an(M 1 H)1 value of 739.38. In your experiments, yourepeat edly obtain an (M 1 H)1 value of 767.38. What isthe cause of this discrepancy and what does it tell youabout the region of the protein from which this peptide isderived?
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Instruction for the said activity: Write the structure of each of the following peptide at pH7 and identify how many peptide bond in each number. d. Alanyl-phenylalanine- aspartate- cysteine e. Threonyl- Isoleucyl-methionyl- leucine f. Lysyl-alanine -Phenylalanyl-tyrosyl- serine
pls. help. understand this question and explain step by step. I really wanna get good at this subject so any help with good explanation is greatly appreciated
Activity: Write the line structure of each of the following peptide at pH7 and identify how many peptide bond in each number. 1. Glycyl-valyl-serine 2. Threonyl-cysteine 3. Isoleucyl-methionyl-aspartate
ans. part d and e
a. Suppose that you have the peptide Ala-Gly-Tyr-His-Leu and you treat it with FDNB and then 6M HCl. Draw the structures of all the products that you will have in solution (assume all reactions to go to completion).
Pls help.
Suppose you have a solution of a protein, which contains a specific Tyr residue that has an actual (measured) pKa of 8.8. The protein binds a ligand by several noncovalent interactions, one of which is a hydrogen bond in which the Tyr phenolic hydroxyl group must serve as a hydrogen bond donor. Calculate the percentage of the protein molecules in which that tyrosyl residue's phenolic hydroxyl group could serve as a hydrogen bond donor at pH 8.5
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.

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