Table 27.2 pK, Values for lonizable Groups of Amino Acids pK of a-COOH pK, of a-NH, pK, of Side Chain Isoelectric Amino Acid Point (pl) Alanine 2.35 9.87 6.11 Arginine 2.01 9.04 12.48 10.76 Asparagine 2.02 8.80 5.41 Aspartic acid 2.10 9.82 3.86 2.98 Cysteine 2.05 10.25 8.00 5.02 Glutamic acid 2.10 9.47 4.07 3.08 Glutamine 2.17 9.13 5.65 - Glycine 2.35 9.78 6.06 - Histidine 1.77 9.18 6.10 7.64 Isoleucine 2.32 9.76 6.04 Leucine 2.33 9.74 6.04 Lysine 2.18 8.95 10.53 9.74 Methionine 2.28 9.21 5.74 Phenylalanine 2.58 9.24 5.91 Proline 2.00 10.60 6.30 Serine 2.21 9.15 5.68 Threonine 2.09 9.10 5.60 Tryptophan 2.38 9.39 5.88 Tyrosine 2.20 9.11 10.07 5.63 Valine 2.29 9.72 6.00
Table 27.2 pK, Values for lonizable Groups of Amino Acids pK of a-COOH pK, of a-NH, pK, of Side Chain Isoelectric Amino Acid Point (pl) Alanine 2.35 9.87 6.11 Arginine 2.01 9.04 12.48 10.76 Asparagine 2.02 8.80 5.41 Aspartic acid 2.10 9.82 3.86 2.98 Cysteine 2.05 10.25 8.00 5.02 Glutamic acid 2.10 9.47 4.07 3.08 Glutamine 2.17 9.13 5.65 - Glycine 2.35 9.78 6.06 - Histidine 1.77 9.18 6.10 7.64 Isoleucine 2.32 9.76 6.04 Leucine 2.33 9.74 6.04 Lysine 2.18 8.95 10.53 9.74 Methionine 2.28 9.21 5.74 Phenylalanine 2.58 9.24 5.91 Proline 2.00 10.60 6.30 Serine 2.21 9.15 5.68 Threonine 2.09 9.10 5.60 Tryptophan 2.38 9.39 5.88 Tyrosine 2.20 9.11 10.07 5.63 Valine 2.29 9.72 6.00
World of Chemistry, 3rd edition
3rd Edition
ISBN:9781133109655
Author:Steven S. Zumdahl, Susan L. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan L. Zumdahl, Donald J. DeCoste
Chapter21: Biochemistry
Section: Chapter Questions
Problem 6A
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Question
Write the form of lysine most prevalent at pH 1.0 and then show its reaction with the following. Consult Table 27.2 for pKa values of the ionizable groups in lysine.
Q.) 2 mol NaOH
Transcribed Image Text:Table 27.2
pK, Values for lonizable Groups of Amino Acids
pK of
a-COOH
pK, of
a-NH,
pK, of
Side Chain
Isoelectric
Amino Acid
Point (pl)
Alanine
2.35
9.87
6.11
Arginine
2.01
9.04
12.48
10.76
Asparagine
2.02
8.80
5.41
Aspartic acid
2.10
9.82
3.86
2.98
Cysteine
2.05
10.25
8.00
5.02
Glutamic acid
2.10
9.47
4.07
3.08
Glutamine
2.17
9.13
5.65
-
Glycine
2.35
9.78
6.06
-
Histidine
1.77
9.18
6.10
7.64
Isoleucine
2.32
9.76
6.04
Leucine
2.33
9.74
6.04
Lysine
2.18
8.95
10.53
9.74
Methionine
2.28
9.21
5.74
Phenylalanine
2.58
9.24
5.91
Proline
2.00
10.60
6.30
Serine
2.21
9.15
5.68
Threonine
2.09
9.10
5.60
Tryptophan
2.38
9.39
5.88
Tyrosine
2.20
9.11
10.07
5.63
Valine
2.29
9.72
6.00
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