Homework Answers
Ans:
Carboxypeptidase is an enzyme that hydrolyzes a peptide bond at the carboxy-terminal (C-terminal) at the end of a peptide.
- Accordingly, ‘Asp’ is the ‘C-terminal’ of the octapeptide.
- So, 1-2-3-4-5-6-7-Asp
Edman degradation method is used to find the sequence of amino acids in a peptide. This method cleaves the peptide from N-terminal without disturbing the peptide bonds between other amino acid.
- Since ‘Gly’ comes out of octapeptide, ‘Gly’ is the ‘N’ terminal of octapeptide. i.e. Gly-2-3-4-5-6-7-Asp
- Since ‘Gly’ comes out of tetrapeptide ‘A’, ‘Gly’ is the ‘N’ terminal of ‘A’ i.e. A = Gly-2-3-4
- Since ‘Met’ comes out of tetrapeptide ‘B’, ‘Met’ is the ‘N’ terminal of ‘B’ i.e. B = Met-6-7-Asp
- Since ‘Gly’ comes out of dipeptide ‘C’, ‘Gly’ is the ‘N’ terminal of ‘C’ i.e. C = Gly-2
- Since ‘Leu’ comes out of dipeptide ‘D’, ‘Leu’ is the ‘N’ terminal of ‘D’ i.e. D = Leu-4
Chymotrypsin is an enzyme that cleaves on the C-terminal phenylalanine (Phe), tryptophan (Trp), and tyrosine (Tyr) on peptide chains. It shows specificity for aromatic amino acids because of its hydrophobic pocket.
- Accordingly, octapeptide breaks at ‘Trp’ forming two tetrapeptides ‘A’ & ‘B’.
- So, Gly-2-Leu-Trp-Met-6-7-Asp ---> Gly-2-Leu-Trp (A) + Met-6-7-Asp (B)
Trypsin is an enzyme that cleaves peptide chains mainly at the carboxyl side of the amino acids lysine or arginine.
- So, position ‘2’ must be ‘Lysine-Lys’
- Gly-Lys-Leu-Trp (A) + trypsin --> Gly-Lys (C) + Leu-Trp (D)
Partial hydrolysis of B:
Since Met-Pro is one of the products, position ‘6’ must be ‘Pro’.
Met-Pro-7-Asp (B) ---> Met-Pro + other product
Since ‘Ala’ is the only amino acid left, that is bound to take the position ‘7’.
So the octapeptide is: Gly-Lys-Leu-Trp-Met-Pro-Ala-Asp
A = Gly-Lys-Leu-Trp
B = Met-Pro-Ala-Asp
C= Gly-Lys
D= Leu-Trp
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Be sure to answer all parts. An octapeptide contains the following amino acids: Ala, Pro, Gly,...
An octapeptide contains the following amino acids: Met, Thr, Cys, Asp, Phe, Arg, Glu, Gln. Carboxypeptidase...
An octapeptide contains the following amino acids: Met, Thr, Cys, Asp, Phe, Arg, Glu, Gln. Carboxypeptidase treatment of the octapeptide forms Asp and a heptapeptide. Treatment of the octapeptide with Chymotrypsin forms forms two tetrapeptides, A and B. Treatment of A with Trypsin yields two dipeptides, C and D. Edman degradation cleaves the following amino acids from each peptide: Cys (octapeptide), Cys (A), Gln (B), Cys (C), Glu(D). Partial hydrolysis of tetrapeptide B forms Gln-Thr in addition to other products....
An octapeptide contains the following amino acids: Met, Thr, Cys, Asp, Phe, Arg, Glu, Gln. Carboxypeptidase...
An octapeptide contains the following amino acids: Met, Thr, Cys, Asp, Phe, Arg, Glu, Gln. Carboxypeptidase treatment of the octapeptide forms Asp and a heptapeptide. Treatment of the octapeptide with Chymotrypsin forms forms two tetrapeptides, A and B. Treatment of A with Trypsin yields two dipeptides, C and D. Edman degradation cleaves the following amino acids from each peptide: Cys (octapeptide), Cys (A), Gln (B), Cys (C), Glu(D). Partial hydrolysis of tetrapeptide B forms Gln-Thr in addition to other products....
What fragments will be obtained by a trypsin hydrolysis of the following octapeptide? Ala-Val-Trp-Lys-Phe-Gly-Arg-Met A) Ala-Val-Trp-Lys-Phe...
What fragments will be obtained by a trypsin hydrolysis of the following octapeptide? Ala-Val-Trp-Lys-Phe-Gly-Arg-Met A) Ala-Val-Trp-Lys-Phe and Gly-Arg-Met 3) Ala-Val-Trp-Lys-Phe-Gly and Arg-Met - Ala-Val-Trp-Lys and Phe-Gly-Arg and Met ) Ala-Val-Trp-Lys and Phe and Gly-Arg and Met ) Ala-Val-Trp and Lys-Phe-Gly and Arg-Met Bradykinin is a nonapeptide, Arg-Pro-Pro-Gly-Phe-Ser-Pro-Phe-Arg. In addition to one mole of Arg, what peptides are present after hydrolysis of bradykinin with chymotrypsin? A) Arg-Pro-Pro and Gly-Phe and Ser-Pro-Phe B) Pro-Pro-Gly and Phe-Ser-Pro-Phe-Arg C) Arg-Pro-Pro-Gly-Phe and Ser-Pro-Phe ?) Arg-Pro-Pro-Gly-Phe-Ser...
Deduce the sequence of a heptapeptide that contains the amino acids Met, Gln, Phe, Leu, Cys,...
Deduce the sequence of a heptapeptide that contains the amino
acids Met, Gln, Phe, Leu, Cys, Val, and Arg, from the following
experimental data. Edman degradation cleaves Cys from the
heptapeptide, and carboxypeptidase forms Gln and a hexapeptide.
Treatment of the heptapeptide with chymotrypsin forms a hexapeptide
and a single amino acid. Treatment of the heptapeptide with trypsin
forms a pentapeptide and a dipeptide. Partial hydrolysis forms Gln,
Cys, Phe, and the tripeptides Leu-Met-Val and Met-Val-Arg.
Be sure to answer...
Use the given experimental data to deduce the sequence of an octapeptide that contains the amino...
Use the given experimental data to deduce the sequence of an octapeptide that contains the amino acids His, Ala (2 equiv), Val (2 equiv), Ser, Gly, and Pro. Edman degradation cleaves Ala from the octapeptide, and carboxypeptidase forms Gly and a heptapeptide. Partial hydrolysis forms the following fragments: Pro-Val-Gly, His-Val-Pro, Ala, and Ala-Ser-His-Val.
1. Partial hydrolysis of lysozyme yielded an octapeptide that was later identified as the N-terminal segment of...
1. Partial hydrolysis of lysozyme yielded an octapeptide that was later identified as the N-terminal segment of the protein. From the following information, determine the sequence of this octapeptide. a. The following amino acids were identified after complete hydrolysis of the octapeptide: Arginine (Arg) Glycine (Gly) Phenylalanine (Phe) Cysteine (Cys) Leucine (Leu) Valine (Val) Glutamic Acid (Glu) Lysine (Lys) b. Treatment of the octapeptide with dinitroflurobenzene (Sanger reagent) followed by complete hydrolysis gave lysine (Lys) labeled with two dinitrophenyl (DNP) groups. c. Treatment of the octapeptide with trypsin gave lysine...
please explain how to solve this problem, the answer is provided 9. Peptides: (20 pts.). A...
please explain how to solve this problem, the answer
is provided
9. Peptides: (20 pts.). A polypeptide (X) gives 7 fragments when treated with chymotrypsin (A-G). The same peptide also gives 9 fragments when treated with trypsin (I- IX). After Chymotrypsin A) Thr-Thr-Tyr-Ala-Gly-Phe-Phe-Ile-Asp- Lys B) Ala-Cys-Pro-Leu-Tyr-Gin-lle-Arg C) Met-Ser-Thr-Tyr-Pro-Gly-Arg D) Cys-Leu-Val-Phe-Ile-Lys E) Leu-Ala-Trp-Gly-Val F) Ser-Phe-Ala-Pro-Lys G) Met-Asp-Lys Afier Trypsin I) Ala-Pro-Lys-Met-Asp-Lys-Thr-Thr-Tyr II) Pro-Gly-Arg-Cys-Leu-Val-Phe III) Ile-Lys-Ala-Cys-Pro-Leu-Tyr IV) Ile-Asp-Lys-Met-Ser-Thr-Tyr V) Gin-Ile-Arg-Leu-Ala-Trp VIAla-Gly-Phe VII) Gly-Val VIII) Ser-Phe LX) Phe A) What is the primary...
Please be specific about the solution and thank you O points) Deduce the sequence of a...
Please be specific about the solution and thank
you
O points) Deduce the sequence of a pentapeptide that contains the amino acids Ala, Lys, Gly, Ser, and Tyr, from the following experimental data. Edman degradation cleaves Gly from the pentapeptide, and trypsin treatment gives Ala and a tetrapeptide. Treatment of the pentapeptide with chymotrypsin forms a dipeptide and a tripeptide. Partial hydrolysis forms Gly, Ser, and the tripeptide Tyr-Lys-Ala.
Be sure to answer all parts. Give the amino acid sequence of an octapeptide that contains...
Be sure to answer all parts. Give the amino acid sequence of an octapeptide that contains the amino acids Ile, Asp, Thr, Gln, Met, Leu, Lys (2 equiv), and forms the following fragments when partially hydrolyzed with HCl: Asp―Lys―Ile―Thr, Met―Lys―Asp, and Ile―Thr―Gln―Leu.
Need help with #2 Clearly provide the 3-letter symbol for the correct sequence of cach amino...
Need help with #2
Clearly provide the 3-letter symbol for the correct sequence of cach amino acid in each of listings of the amino acids in the peptide or in any fragments are simply listed in alphabetical order. A subscriptive the number of that amino acid. Use parentheses to incorporate the unknown amino acids after each treatment 1. A five amino acid peptide contains: Arg. Glu, His, Phe, and Ser This peptide yields the following results when broken down into...
What fragments will be obtained by a trypsin hydrolysis of the following octapeptide? Ala-Val-Trp-Lys-Phe-Gly-Arg-Met A) Ala-Val-Trp-Lys-Phe and Gly-Arg-Met 3) Ala-Val-Trp-Lys-Phe-Gly and Arg-Met - Ala-Val-Trp-Lys and Phe-Gly-Arg and Met ) Ala-Val-Trp-Lys and Phe and Gly-Arg and Met ) Ala-Val-Trp and Lys-Phe-Gly and Arg-Met Bradykinin is a nonapeptide, Arg-Pro-Pro-Gly-Phe-Ser-Pro-Phe-Arg. In addition to one mole of Arg, what peptides are present after hydrolysis of bradykinin with chymotrypsin? A) Arg-Pro-Pro and Gly-Phe and Ser-Pro-Phe B) Pro-Pro-Gly and Phe-Ser-Pro-Phe-Arg C) Arg-Pro-Pro-Gly-Phe and Ser-Pro-Phe ?) Arg-Pro-Pro-Gly-Phe-Ser...
Deduce the sequence of a heptapeptide that contains the amino
acids Met, Gln, Phe, Leu, Cys, Val, and Arg, from the following
experimental data. Edman degradation cleaves Cys from the
heptapeptide, and carboxypeptidase forms Gln and a hexapeptide.
Treatment of the heptapeptide with chymotrypsin forms a hexapeptide
and a single amino acid. Treatment of the heptapeptide with trypsin
forms a pentapeptide and a dipeptide. Partial hydrolysis forms Gln,
Cys, Phe, and the tripeptides Leu-Met-Val and Met-Val-Arg.
Be sure to answer...
please explain how to solve this problem, the answer
is provided
9. Peptides: (20 pts.). A polypeptide (X) gives 7 fragments when treated with chymotrypsin (A-G). The same peptide also gives 9 fragments when treated with trypsin (I- IX). After Chymotrypsin A) Thr-Thr-Tyr-Ala-Gly-Phe-Phe-Ile-Asp- Lys B) Ala-Cys-Pro-Leu-Tyr-Gin-lle-Arg C) Met-Ser-Thr-Tyr-Pro-Gly-Arg D) Cys-Leu-Val-Phe-Ile-Lys E) Leu-Ala-Trp-Gly-Val F) Ser-Phe-Ala-Pro-Lys G) Met-Asp-Lys Afier Trypsin I) Ala-Pro-Lys-Met-Asp-Lys-Thr-Thr-Tyr II) Pro-Gly-Arg-Cys-Leu-Val-Phe III) Ile-Lys-Ala-Cys-Pro-Leu-Tyr IV) Ile-Asp-Lys-Met-Ser-Thr-Tyr V) Gin-Ile-Arg-Leu-Ala-Trp VIAla-Gly-Phe VII) Gly-Val VIII) Ser-Phe LX) Phe A) What is the primary...
Please be specific about the solution and thank
you
O points) Deduce the sequence of a pentapeptide that contains the amino acids Ala, Lys, Gly, Ser, and Tyr, from the following experimental data. Edman degradation cleaves Gly from the pentapeptide, and trypsin treatment gives Ala and a tetrapeptide. Treatment of the pentapeptide with chymotrypsin forms a dipeptide and a tripeptide. Partial hydrolysis forms Gly, Ser, and the tripeptide Tyr-Lys-Ala.
Need help with #2
Clearly provide the 3-letter symbol for the correct sequence of cach amino acid in each of listings of the amino acids in the peptide or in any fragments are simply listed in alphabetical order. A subscriptive the number of that amino acid. Use parentheses to incorporate the unknown amino acids after each treatment 1. A five amino acid peptide contains: Arg. Glu, His, Phe, and Ser This peptide yields the following results when broken down into...
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