5. Refer to Model 2 for information relevant to this question. A sample of the peptide Lys net charge of zero between what two pH values? What is the pI of Lys-Glu-Ser?
5. Refer to Model 2 for information relevant to this question. A sample of the peptide Lys net charge of zero between what two pH values? What is the pI of Lys-Glu-Ser?
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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Transcribed Image Text:5. Refer to Model 2 for information relevant to this question. A sample of the peptide Lys-Glu-Ser has a
net charge of zero between what two pH values? What is the pl of Lys-Glu-Ser?
Model 2:
The pl of a peptide is determined by examining the ionizable groups. The protonated and unprotonated
forms of each ionizable group are in equilibrium. Consider the peptide Lys-Glu-Ser shown below at pH
7.2. The complete structure is on on the left and a stylized structure with just the ionizable groups is on the
right. While the N-terminal is depicted as protonated, a sample of Lys-Glu-Ser is composed of a population
of molecules and within that population some molecules contain a non-protonated N-terminal group
at pH 7.2.
may
H3N*
COO-
H3N-CH-CIN-CH C N-CH C-
H.
pK 3.5
OH
H.
pK= 8.5
COO-
CH2
CH2
CH2
NH,
pK 10.0
pK 4.2
CH2
CH2
OH
CH2
c=0
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