TABLE 5.1 Properties of the common amino acids found in proteins pK, of a-COOH Group pk, of a-NH Group pK, of lonizing Side Chain Abbreviations: 1- Residue Mass Occurrence in Name and 3-letter codes (daltons) Proteins (mol %) Alanine A, Ala 2.3 9.7 71.08 8.7 Arginine R, Arg 2.2 9.0 12.5 156.20 5.0 Asparagine N, Asn 2.0 8.8 114.11 4.2 D, Asp C, Cys Q, Gin E, Glu G, Gly Н, His I, lle Aspartic acid 2.1 9.8 3.9 115.09 5.9 Cysteine 1.8 10.8 8.3 103.14 1.3 Glutamine 2.2 9.1 128.14 3.7 Glutamic acid 2.2 9.7 4.2 129.12 6.6 Glycine 2.3 9.6 57.06 7.9 Histidine 1.8 9.2 6.0 137.15 2.4 Isoleucine 2.4 9.7 113.17 5.5 Leucine L, Leu 2.4 9.6 113.17 8.9 K, Lys М, Met F, Phe Lysine 2.2 9.0 10.0 128.18 5.5 Methionine 2.3 9.2 131.21 2.0 Phenylalanine 1.8 9.1 147.18 4.0 Proline P, Pro 2.0 10.6 97.12 4.7 Serine S, Ser 2.2 9.2 87.08 5.8 Threonine T, Thr 2.6 10.4 101.11 5.6 Tryptophan W, Trp 2.4 9.4 186.21 1.5 Tyrosine Y, Tyr 2.2 9.1 10.1 163.18 3.5 Valine V, Val 2.3 9.6 99.14 7.2
TABLE 5.1 Properties of the common amino acids found in proteins pK, of a-COOH Group pk, of a-NH Group pK, of lonizing Side Chain Abbreviations: 1- Residue Mass Occurrence in Name and 3-letter codes (daltons) Proteins (mol %) Alanine A, Ala 2.3 9.7 71.08 8.7 Arginine R, Arg 2.2 9.0 12.5 156.20 5.0 Asparagine N, Asn 2.0 8.8 114.11 4.2 D, Asp C, Cys Q, Gin E, Glu G, Gly Н, His I, lle Aspartic acid 2.1 9.8 3.9 115.09 5.9 Cysteine 1.8 10.8 8.3 103.14 1.3 Glutamine 2.2 9.1 128.14 3.7 Glutamic acid 2.2 9.7 4.2 129.12 6.6 Glycine 2.3 9.6 57.06 7.9 Histidine 1.8 9.2 6.0 137.15 2.4 Isoleucine 2.4 9.7 113.17 5.5 Leucine L, Leu 2.4 9.6 113.17 8.9 K, Lys М, Met F, Phe Lysine 2.2 9.0 10.0 128.18 5.5 Methionine 2.3 9.2 131.21 2.0 Phenylalanine 1.8 9.1 147.18 4.0 Proline P, Pro 2.0 10.6 97.12 4.7 Serine S, Ser 2.2 9.2 87.08 5.8 Threonine T, Thr 2.6 10.4 101.11 5.6 Tryptophan W, Trp 2.4 9.4 186.21 1.5 Tyrosine Y, Tyr 2.2 9.1 10.1 163.18 3.5 Valine V, Val 2.3 9.6 99.14 7.2
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Question
Given the following peptide
SEPIMAPVEYPK
(a) Estimate the net charge at pH 7 and at pH 12. Assume the pKa values
given in as shown. (b) How many peptides would result if this peptide were treated with
(1) cyanogen bromide, (2) trypsin, or (3) chymotrypsin?
(c) Suggest a method for separating the peptides produced by chymotrypsin
treatment.
Transcribed Image Text:TABLE 5.1 Properties of the common amino acids found in proteins
pK, of a-COOH
Group
pk, of a-NH
Group
pK, of lonizing
Side Chain
Abbreviations: 1-
Residue Mass
Occurrence in
Name
and 3-letter codes
(daltons)
Proteins (mol %)
Alanine
A, Ala
2.3
9.7
71.08
8.7
Arginine
R, Arg
2.2
9.0
12.5
156.20
5.0
Asparagine
N, Asn
2.0
8.8
114.11
4.2
D, Asp
C, Cys
Q, Gin
E, Glu
G, Gly
Н, His
I, lle
Aspartic acid
2.1
9.8
3.9
115.09
5.9
Cysteine
1.8
10.8
8.3
103.14
1.3
Glutamine
2.2
9.1
128.14
3.7
Glutamic acid
2.2
9.7
4.2
129.12
6.6
Glycine
2.3
9.6
57.06
7.9
Histidine
1.8
9.2
6.0
137.15
2.4
Isoleucine
2.4
9.7
113.17
5.5
Leucine
L, Leu
2.4
9.6
113.17
8.9
K, Lys
М, Met
F, Phe
Lysine
2.2
9.0
10.0
128.18
5.5
Methionine
2.3
9.2
131.21
2.0
Phenylalanine
1.8
9.1
147.18
4.0
Proline
P, Pro
2.0
10.6
97.12
4.7
Serine
S, Ser
2.2
9.2
87.08
5.8
Threonine
T, Thr
2.6
10.4
101.11
5.6
Tryptophan
W, Trp
2.4
9.4
186.21
1.5
Tyrosine
Y, Tyr
2.2
9.1
10.1
163.18
3.5
Valine
V, Val
2.3
9.6
99.14
7.2
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