The following sequence alignment shows the point mutation that exists in hemoglobin for some cases of sickle cell (HbS) compared to wild type adult hemoglobin (HbA) VLSPADK (HBA) VLSPAVK (HbS) Based solely on the peptide fragment shown, answer the following questions: What is the charge range for the HbA peptide shown above? **Hint, what is convention for how charge ranges are written?? At physiological pH, what is the charge of the HbS peptide? →>> What is the impact of this point mutation? Choose the letter for the answer choice that best applies. a. Allows for hydrophobic contacts in HbS that lead to higher order structures beyond the a2ß2 heterotetramer b. Allows for ionic interactions in HbS that aids in interactions with solvent c. Destabilizes the ionic interactions of the dimer-dimer interface and prevents the T- to R- state transition d. Prevents the coordination of Fe²+ at the protoporphyrin ring

Human Anatomy & Physiology (11th Edition)
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Author:Elaine N. Marieb, Katja N. Hoehn
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Chapter1: The Human Body: An Orientation
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The following sequence alignment shows the point mutation that exists in hemoglobin for
some cases of sickle cell (HbS) compared to wild type adult hemoglobin (HbA)
VLSPADK (HBA)
VLSPAVK (HbS)
Based solely on the peptide fragment shown, answer the following questions:
What is the charge range for the HbA peptide shown above?
**Hint, what is convention for how charge ranges are written??
At physiological pH, what is the charge of the HbS peptide?
→>>>
What is the impact of this point mutation? Choose the letter for the answer choice that best
applies.
a. Allows for hydrophobic contacts in HbS that lead to higher order structures beyond the
a2ß2 heterotetramer
b. Allows for ionic interactions in HbS that aids in interactions with solvent
c. Destabilizes the ionic interactions of the dimer-dimer interface and prevents the T- to R-
state transition
d. Prevents the coordination of Fe²+ at the protoporphyrin ring
Transcribed Image Text:The following sequence alignment shows the point mutation that exists in hemoglobin for some cases of sickle cell (HbS) compared to wild type adult hemoglobin (HbA) VLSPADK (HBA) VLSPAVK (HbS) Based solely on the peptide fragment shown, answer the following questions: What is the charge range for the HbA peptide shown above? **Hint, what is convention for how charge ranges are written?? At physiological pH, what is the charge of the HbS peptide? →>>> What is the impact of this point mutation? Choose the letter for the answer choice that best applies. a. Allows for hydrophobic contacts in HbS that lead to higher order structures beyond the a2ß2 heterotetramer b. Allows for ionic interactions in HbS that aids in interactions with solvent c. Destabilizes the ionic interactions of the dimer-dimer interface and prevents the T- to R- state transition d. Prevents the coordination of Fe²+ at the protoporphyrin ring
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