1. Lets start by determining the products we would get from treating a polypeptide with some of the procedures above. Using the polypeptide A-R-D-K-P-C-F-M-P-N-G A) What would acid hydrolysis give you? What would you get if you used Chymotrypsin? B) What would you get if you used Cyanogen bromide? C) What would you get if you used Trypsin? How about using Trypsin after aminoethylation?

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
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Please answer and explain this Biochemsitry Question to the best of your ability

Protein Sequencing Problems
To get you started, here is a table with the specificities for some of the enzymatic
and chemical procedures used in sequencing proteins:
Procedure
Edman Degradation
Carboxypeptidase A
Carboxypeptidase B
Cyanogen Bromide
aminoethylation
Trypsin
Chymotrypsin
Staphylococccus aureus V8
Protease
Anhydrous Cyanogen Bromide C side of R
Submaxillarus Protease
Endoproteinase Lys C
Asp-N-protease
Thermolysin
Pepsin
Acid Phosphatase
Acid Hydrolysis
Site
R₁-1
R₂
C side of N terminus R = any amino acid
N side of C terminus R, # Arg, Lys, Pro
R₁-1 Pro
N side of C terminus R Arg, Lys, AECys
R₁-1 # Pro
R = Met
C side of R₁
Cys residue
C side of R
Cside of R
C side of R
C side of R₁
C side of R
N side of R
N side of R₁
N side of R
Specificity
C side of R₁
Breaks all peptide
bonds
Rn+1
R = Met, Trp
Reacts with Cys to give
AECys
R = Lys, Arg, AECys
R₂+1 #Pro
R - Phe, Trp, Tyr, Leu
R₁+1 #Pro
R = Asp D, Glu E
R = Arg
R = Lys K
R = Asp D, Glu E
Comment
Ineffective for blocked N termini
Removes 1 (usually up to 4) residues
sequentially
Removes 1 (usually up to 4) residues
sequentially
Highly Specific
Highly Specific
Highly Specific
Sometimes cleaves at other sites
R = Leu, Ile, Phe, Trp, Tyr, Sometimes cleaves at other sites
Val
R₁+1 #Pro
R = Leu, Asp, Glu, Phe,
Tyr, Trp
R₁+1 # Pro
R = Asp, Glu
The table uses terms like "R". I've drawn a short piece of polypeptide so you
can visualize where these cleavages are taking place.
N side of R₁
Fairly nonspecific
Highly Specific
C side of R₁
If the amino acids are listed with dashes connecting them, they are in sequence.
If the amino acids are listed separated by commas, they are not in order.
For example.....
If I treat G-K-A-V-M with trypsin I will get two pieces. One will be (G-K) and
the other will be (A-V-M). If I only know the composition (and not the actual
sequence for these pieces) it would be written (G, K) and (A, M, V).
Transcribed Image Text:Protein Sequencing Problems To get you started, here is a table with the specificities for some of the enzymatic and chemical procedures used in sequencing proteins: Procedure Edman Degradation Carboxypeptidase A Carboxypeptidase B Cyanogen Bromide aminoethylation Trypsin Chymotrypsin Staphylococccus aureus V8 Protease Anhydrous Cyanogen Bromide C side of R Submaxillarus Protease Endoproteinase Lys C Asp-N-protease Thermolysin Pepsin Acid Phosphatase Acid Hydrolysis Site R₁-1 R₂ C side of N terminus R = any amino acid N side of C terminus R, # Arg, Lys, Pro R₁-1 Pro N side of C terminus R Arg, Lys, AECys R₁-1 # Pro R = Met C side of R₁ Cys residue C side of R Cside of R C side of R C side of R₁ C side of R N side of R N side of R₁ N side of R Specificity C side of R₁ Breaks all peptide bonds Rn+1 R = Met, Trp Reacts with Cys to give AECys R = Lys, Arg, AECys R₂+1 #Pro R - Phe, Trp, Tyr, Leu R₁+1 #Pro R = Asp D, Glu E R = Arg R = Lys K R = Asp D, Glu E Comment Ineffective for blocked N termini Removes 1 (usually up to 4) residues sequentially Removes 1 (usually up to 4) residues sequentially Highly Specific Highly Specific Highly Specific Sometimes cleaves at other sites R = Leu, Ile, Phe, Trp, Tyr, Sometimes cleaves at other sites Val R₁+1 #Pro R = Leu, Asp, Glu, Phe, Tyr, Trp R₁+1 # Pro R = Asp, Glu The table uses terms like "R". I've drawn a short piece of polypeptide so you can visualize where these cleavages are taking place. N side of R₁ Fairly nonspecific Highly Specific C side of R₁ If the amino acids are listed with dashes connecting them, they are in sequence. If the amino acids are listed separated by commas, they are not in order. For example..... If I treat G-K-A-V-M with trypsin I will get two pieces. One will be (G-K) and the other will be (A-V-M). If I only know the composition (and not the actual sequence for these pieces) it would be written (G, K) and (A, M, V).
1. Lets start by determining the products we would get from treating a
polypeptide with some of the procedures above.
Using the polypeptide
A-R-D-K-P-C-F-M-P-N-G
A) What would acid hydrolysis give you? What would you get if you
used Chymotrypsin?
B) What would you get if you used Cyanogen bromide?
C) What would you get if you used Trypsin? How about using Trypsin
after aminoethylation?
Transcribed Image Text:1. Lets start by determining the products we would get from treating a polypeptide with some of the procedures above. Using the polypeptide A-R-D-K-P-C-F-M-P-N-G A) What would acid hydrolysis give you? What would you get if you used Chymotrypsin? B) What would you get if you used Cyanogen bromide? C) What would you get if you used Trypsin? How about using Trypsin after aminoethylation?
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