The isoelectric point (pl) of a peptide is the pH at which the Group pK peptide ceases to migrate in an electric field. Since a peptide is aspartate 3.7 zwitterionic, there are the same number of positive charges as glutamate 4.3 negative charges on the peptide population. The pl can be histidine 6.0 estimated within 0.1 or 0.2 pH units from the pK values of all cysteine 8.2 the proton dissociable groups in the peptide. tyrosine 10.1 Determine the total positive charge on the peptide HANSEN lysine 10.5 when all acidic and basic groups are fully protonated. Enter arginine 12.5 your answer without the sign. peptide amino group 8.0 peptide carboxyl group 3.4 charge: Select the pK values used to estimate the pl. O 3.4 O 4.3 O 6.0 O 8.0 Estimate the pl value of the HANSEN peptide. pl =
The isoelectric point (pl) of a peptide is the pH at which the Group pK peptide ceases to migrate in an electric field. Since a peptide is aspartate 3.7 zwitterionic, there are the same number of positive charges as glutamate 4.3 negative charges on the peptide population. The pl can be histidine 6.0 estimated within 0.1 or 0.2 pH units from the pK values of all cysteine 8.2 the proton dissociable groups in the peptide. tyrosine 10.1 Determine the total positive charge on the peptide HANSEN lysine 10.5 when all acidic and basic groups are fully protonated. Enter arginine 12.5 your answer without the sign. peptide amino group 8.0 peptide carboxyl group 3.4 charge: Select the pK values used to estimate the pl. O 3.4 O 4.3 O 6.0 O 8.0 Estimate the pl value of the HANSEN peptide. pl =
Chapter26: Biomolecules: Amino Acids, Peptides, And Proteins
Section26.SE: Something Extra
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![The isoelectric point (pl) of a peptide is the pH at which the
Group
pK
peptide ceases to migrate in an electric field. Since a peptide is
aspartate
3.7
zwitterionic, there are the same number of positive charges as
glutamate
4.3
negative charges on the peptide population. The pl can be
histidine
6.0
estimated within 0.1 or 0.2 pH units from the pK values of all
cysteine
8.2
the proton dissociable groups in the peptide.
tyrosine
10.1
Determine the total positive charge on the peptide HANSEN
lysine
10.5
when all acidic and basic groups are fully protonated. Enter
your answer without the sign.
arginine
12.5
peptide amino group
8.0
peptide carboxyl group
3.4
charge:
Select the pK values used to estimate the pl.
O 3.4
O 4.3
O 6.0
O 8.0
Estimate the pl value of the HANSEN peptide.
pl =](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fd8455032-0e4a-4ed1-afbf-4c44f1d7d7c4%2F6f984c12-b522-4202-848b-ffed99d7a1b2%2Fywvwbna_processed.jpeg&w=3840&q=75)
Transcribed Image Text:The isoelectric point (pl) of a peptide is the pH at which the
Group
pK
peptide ceases to migrate in an electric field. Since a peptide is
aspartate
3.7
zwitterionic, there are the same number of positive charges as
glutamate
4.3
negative charges on the peptide population. The pl can be
histidine
6.0
estimated within 0.1 or 0.2 pH units from the pK values of all
cysteine
8.2
the proton dissociable groups in the peptide.
tyrosine
10.1
Determine the total positive charge on the peptide HANSEN
lysine
10.5
when all acidic and basic groups are fully protonated. Enter
your answer without the sign.
arginine
12.5
peptide amino group
8.0
peptide carboxyl group
3.4
charge:
Select the pK values used to estimate the pl.
O 3.4
O 4.3
O 6.0
O 8.0
Estimate the pl value of the HANSEN peptide.
pl =
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